Re: Yep.... there are very low powered guitar amplifiers
Yes I'm know why it is called class A, but I also believe that class A should give optimum sound quality. If not, search for the problem elsewhere, not with class A.
André
destroyer X said:
Yes I'm know why it is called class A, but I also believe that class A should give optimum sound quality. If not, search for the problem elsewhere, not with class A.
André
Thank you Roender...will search for someone that has to listen this model
To the ones do not read very well in English...and...considering i do not write very well in english... i will explain the reasons i decide to give up related class A.
Give up means, not to read, not to bother, not to worry...when starting to read a thread about, to go to another thread... not to waste my time anymore.
Something i said to myself.... "you already know.....no need to continue worrying with Class A audio amplifiers...let the ones love to be happy but tell clearly what you think about.... as you are studying those things last 47 to 48 years and have acumulated a good background about.... many mufled ones have played into your home along those years"
- Class A amplifiers are big because not efficient.... they spend a lot of energy and produces small power compared to the energy consumed.... this is not modern, this is not green, this is criminal to your pockets and to the energy bill, the energy generation, your country, your society, you social group, and the world..... if all amplifiers were class A more petrol would be wasted to generate more energy.
- They are big and heavy, and this is ugly into our living room... seems and air conditioned is parking into your living room... creates problems with your wive...took space for living and overheat your air..sometimes smells bad because of new transformer varnish drying.
- They are hard to transport, because big, because heavy..also not good to the health to carry those monsters.
- They are not good to social things..imagine to transport the monster!.... you will need to be fitted into body exercises, to be young and healthy and will need a big car...if you leave it into the rear dumper and break your car..that monster will smash you and your childrens.
- Also very crazy...as you have class A operation into the first watts into Class AB amplifiers as one example...for instance....why to waste 40 watts of energy to listen 1 watt each channel when the AB can provide you CLASS A operation into this same 1 watt?
- Maybe if you live into North Pole, North Sweden, or Nordic countries, finland....Norway.... it will be fine as a heater to your house...also if you have problems to vains you can fix sitting over the heatsinks.... i am out of that....my weather is hot...i am in brazil..this is another reason to give up.
- And they are also mufled!..... so.... despite the audio quality we can have into AB using low power, and some AB can reproduce so good audio as Class A units.... i have to listen something i perceive as mufled!.... no..... reason why i give up
May exist units not mufled.... compensation into the pré amplifier i think...of course must exist.
I hope you could understand me.
Thank you by the help you gave, the suggestions, the ideas helped me to see something i had suspections for long, long years...and i have absolutelly no more doubt.
Enjoy your mufly... and do not forget to turn you treble knob, clockwise, to 3 hours position.
regards,
Carlos
To the ones do not read very well in English...and...considering i do not write very well in english... i will explain the reasons i decide to give up related class A.
Give up means, not to read, not to bother, not to worry...when starting to read a thread about, to go to another thread... not to waste my time anymore.
Something i said to myself.... "you already know.....no need to continue worrying with Class A audio amplifiers...let the ones love to be happy but tell clearly what you think about.... as you are studying those things last 47 to 48 years and have acumulated a good background about.... many mufled ones have played into your home along those years"
- Class A amplifiers are big because not efficient.... they spend a lot of energy and produces small power compared to the energy consumed.... this is not modern, this is not green, this is criminal to your pockets and to the energy bill, the energy generation, your country, your society, you social group, and the world..... if all amplifiers were class A more petrol would be wasted to generate more energy.
- They are big and heavy, and this is ugly into our living room... seems and air conditioned is parking into your living room... creates problems with your wive...took space for living and overheat your air..sometimes smells bad because of new transformer varnish drying.
- They are hard to transport, because big, because heavy..also not good to the health to carry those monsters.
- They are not good to social things..imagine to transport the monster!.... you will need to be fitted into body exercises, to be young and healthy and will need a big car...if you leave it into the rear dumper and break your car..that monster will smash you and your childrens.
- Also very crazy...as you have class A operation into the first watts into Class AB amplifiers as one example...for instance....why to waste 40 watts of energy to listen 1 watt each channel when the AB can provide you CLASS A operation into this same 1 watt?
- Maybe if you live into North Pole, North Sweden, or Nordic countries, finland....Norway.... it will be fine as a heater to your house...also if you have problems to vains you can fix sitting over the heatsinks.... i am out of that....my weather is hot...i am in brazil..this is another reason to give up.
- And they are also mufled!..... so.... despite the audio quality we can have into AB using low power, and some AB can reproduce so good audio as Class A units.... i have to listen something i perceive as mufled!.... no..... reason why i give up
May exist units not mufled.... compensation into the pré amplifier i think...of course must exist.
I hope you could understand me.
Thank you by the help you gave, the suggestions, the ideas helped me to see something i had suspections for long, long years...and i have absolutelly no more doubt.
Enjoy your mufly... and do not forget to turn you treble knob, clockwise, to 3 hours position.
regards,
Carlos
Dear André Visser
Please, read all thread and you will read that i told that several times.
The best quality in audio...for sure...but this is not ALL you need to take decisions about the amplifier class to use.
regards,
Carlos
Please, read all thread and you will read that i told that several times.
The best quality in audio...for sure...but this is not ALL you need to take decisions about the amplifier class to use.
regards,
Carlos
Most class A amplifiers are designed the exotic way and exhibit a high output impedance that translates into a boost in bass and mids with most speakers. Class AB is usually designed for very low output impedance.
You will only notice this non-flat frequency response if you look at the output of the amplifier when it's connected to a speaker.
Anyway, don't expect quality trebble from the old paper cone tweeters shown in your pictures.
You will only notice this non-flat frequency response if you look at the output of the amplifier when it's connected to a speaker.
Anyway, don't expect quality trebble from the old paper cone tweeters shown in your pictures.
Not quality Eva..... level!.... and more than electrical level.... "perceived!"
When you inject steady sinus tone into some amplifier input, and go measuring the output over dummy load, you may think the amplifier is linear...but when playing music, where you have level variations as also frequency variations, some frequencies are reduced, others emphasized and others erased (counter phase)
"Força contro eletro motriz em portugues"... counter forces you have when you send electricity to a moving coil inside a magnetic field....energy is generated back to the amplifier... some units works fine, others not..... read Nikolas Tesla papers the US Government publish after his death... and many years passed the second world war was ended... around 1953...there you will have a lot of interesting things...but not the electrical Ray gun.
One thing is steady single tone going to amplifiers and speakers..and other, completely different, happens when you send complex waves.
The effect i have perceived, many times, repeated times, always while using class A amplifiers, many models, many different circuits...was always alike some kind of dinamic reduction of level...do not know exactly the reason..but for sure i know the effect.
If you had the chance to listen the Compander from Telefunken, used into audiocassetes into the eigthies... the Highcom ... and reproducing a non Highcom encoded tapes with the Highcom control switched on you will understand the effect i am perceiving into the high end.
ADRESS... the compander from Toshiba, also used into cassete tape decks (top of the line during 1981 and 1982) cannot use for that purpose, as example.
This can be adjusted increasing pré amplifier level.
Eva.. search for Suono Magazine.... Italian audiophile magazine and try to find tests made using all kind of speakers...during the eigthies.... all kind of material was used into the speaker cone.
You will see that there is nothing really wrong with paper cones....maybe a little less efficient but for sure the speaker factory had tests to make them linear, even beeing made using paper.
You can construct a 300 Km per hour car using Titanium or wood...depends how good is your design...speed is not connected to the material used.
Into paper cones you may have problems related level, because of weigth and mechanical properties....you will have different problems using other materials too...you can adjust titanium and paper into a speaker housing, controling your passive crossover to allow you flat response.
Eva.... preconceito contra papel em alto falantes?
Mufled!
I have listened that loss into high end since 1968...many speakers were used, soft domes, dampened with oil, metalic domes, electrostatic monsters, horns...many houses, many homes, many amplifiers...but always the same loss into the high end.... ear was young Eva... and others could perceive the same.... folks defends but watch if they do not increase their treble control while playing class A.
Carlos
When you inject steady sinus tone into some amplifier input, and go measuring the output over dummy load, you may think the amplifier is linear...but when playing music, where you have level variations as also frequency variations, some frequencies are reduced, others emphasized and others erased (counter phase)
"Força contro eletro motriz em portugues"... counter forces you have when you send electricity to a moving coil inside a magnetic field....energy is generated back to the amplifier... some units works fine, others not..... read Nikolas Tesla papers the US Government publish after his death... and many years passed the second world war was ended... around 1953...there you will have a lot of interesting things...but not the electrical Ray gun.
One thing is steady single tone going to amplifiers and speakers..and other, completely different, happens when you send complex waves.
The effect i have perceived, many times, repeated times, always while using class A amplifiers, many models, many different circuits...was always alike some kind of dinamic reduction of level...do not know exactly the reason..but for sure i know the effect.
If you had the chance to listen the Compander from Telefunken, used into audiocassetes into the eigthies... the Highcom ... and reproducing a non Highcom encoded tapes with the Highcom control switched on you will understand the effect i am perceiving into the high end.
ADRESS... the compander from Toshiba, also used into cassete tape decks (top of the line during 1981 and 1982) cannot use for that purpose, as example.
This can be adjusted increasing pré amplifier level.
Eva.. search for Suono Magazine.... Italian audiophile magazine and try to find tests made using all kind of speakers...during the eigthies.... all kind of material was used into the speaker cone.
You will see that there is nothing really wrong with paper cones....maybe a little less efficient but for sure the speaker factory had tests to make them linear, even beeing made using paper.
You can construct a 300 Km per hour car using Titanium or wood...depends how good is your design...speed is not connected to the material used.
Into paper cones you may have problems related level, because of weigth and mechanical properties....you will have different problems using other materials too...you can adjust titanium and paper into a speaker housing, controling your passive crossover to allow you flat response.
Eva.... preconceito contra papel em alto falantes?
Mufled!
I have listened that loss into high end since 1968...many speakers were used, soft domes, dampened with oil, metalic domes, electrostatic monsters, horns...many houses, many homes, many amplifiers...but always the same loss into the high end.... ear was young Eva... and others could perceive the same.... folks defends but watch if they do not increase their treble control while playing class A.
Carlos
Well folks..... do a simple test
Visit people that uses Class A amplifier together pré amplifier that uses tone controls.
Of course people that have not readed this thread.
Do not tell them nothing...just go near the equipment and watch the tone control position.
The guy that have the treble into 3 hours will say the unit is not mufled, was never mufled (the control was adjusted and was there since long time ago)
ahahahahah!
regards,
Carlos
Visit people that uses Class A amplifier together pré amplifier that uses tone controls.
Of course people that have not readed this thread.
Do not tell them nothing...just go near the equipment and watch the tone control position.
The guy that have the treble into 3 hours will say the unit is not mufled, was never mufled (the control was adjusted and was there since long time ago)
ahahahahah!
regards,
Carlos
Paper has serious trouble with the two top octaves. It's seldom used in tweeters, except in some really old or low-cost ones. Otherwise it's ok for bass and midrange.
In fact, I use paper bass and midrange drivers in my system (google for B&C 15NW76 and Eminence Delta 10), and they are horn loaded (quite demanding on diapraghm strength), but never a paper tweeter (google for BMS 4552 Nd, this is the latest HF compression driver technology, performance is impressive, and diaphragm is phenolic, plastic!)
In fact, I use paper bass and midrange drivers in my system (google for B&C 15NW76 and Eminence Delta 10), and they are horn loaded (quite demanding on diapraghm strength), but never a paper tweeter (google for BMS 4552 Nd, this is the latest HF compression driver technology, performance is impressive, and diaphragm is phenolic, plastic!)
Yes...some plastic, alike the cup of coffee, when you
scratch your nails over it sounds great... also the Ping Pong game ball sounds great.
For sure there are better things than paper...but for sure it works, as 80 percent of world speaker are made of paper and i do not think 80 percent of those folks are deaf or 80 percent of the factories/industries have no competent engineers.
Speakers enclosure, having many speakers, while designed and tested using acoustic chamber (anecoic chamber) and microphone one meter distant..... microphone frequency response previously known....... all those things are analised to allow result as flat (or not too much unflat) frequency response.
So...made of paper, plastic, metal or other material...speaker factory have, of course, adjusted to be the most flat possible.
And read i have perceived those things using many different speakers, along many years, into many homes and i was young when i first perceived.
Do you know what i think.... this thread will be something exausting to me...people will blame speaker, my ears, my room, my house, my car, my wife, my construction... everything will be said...also that i have not listened ALL class a amplifiers made in this world..but this is ridiculous... all atempts not to accept class A can be a little bit mufled into the high end.
regards,
Carlos
scratch your nails over it sounds great... also the Ping Pong game ball sounds great.
For sure there are better things than paper...but for sure it works, as 80 percent of world speaker are made of paper and i do not think 80 percent of those folks are deaf or 80 percent of the factories/industries have no competent engineers.
Speakers enclosure, having many speakers, while designed and tested using acoustic chamber (anecoic chamber) and microphone one meter distant..... microphone frequency response previously known....... all those things are analised to allow result as flat (or not too much unflat) frequency response.
So...made of paper, plastic, metal or other material...speaker factory have, of course, adjusted to be the most flat possible.
And read i have perceived those things using many different speakers, along many years, into many homes and i was young when i first perceived.
Do you know what i think.... this thread will be something exausting to me...people will blame speaker, my ears, my room, my house, my car, my wife, my construction... everything will be said...also that i have not listened ALL class a amplifiers made in this world..but this is ridiculous... all atempts not to accept class A can be a little bit mufled into the high end.
regards,
Carlos
Also plus and minus 3 decibels are considered flat
The error i perceive..the one i called "mufled" may be something from 4 to 4.5 decibels need to increase the treble level into the pre amplifier.
So... this is my perception, my opinion, subjective, personal evaluation...do not trash you class A because i said that.
I said also class A is the best possible sound we can have.... and everybody knows that.
Do not know about the small loss into high end...why people have not perceived, or not accepted.
Check your tone control folks... and please, do not tell me you are compensating your furniture absortion..... i will be thinking you have "Class A" into your family name.... Alike Peter Class A or something to be so resistant to observe things the way they are.
ahahahahahh!
Carlos
The error i perceive..the one i called "mufled" may be something from 4 to 4.5 decibels need to increase the treble level into the pre amplifier.
So... this is my perception, my opinion, subjective, personal evaluation...do not trash you class A because i said that.
I said also class A is the best possible sound we can have.... and everybody knows that.
Do not know about the small loss into high end...why people have not perceived, or not accepted.
Check your tone control folks... and please, do not tell me you are compensating your furniture absortion..... i will be thinking you have "Class A" into your family name.... Alike Peter Class A or something to be so resistant to observe things the way they are.
ahahahahahh!
Carlos
hi Balaboo
i did not say that the- "JLLH is a low powered Class A amplifier"
what i did say is- "the JLH class A is not suitable for guitar amp, it is a low power class A hi fi amp"
the distinction is the hi fi bit.
i am aware of the- "multitude of low-power valve amplifers that were the norm for guitar amplification"
i would have thought that 10 Watts would be a bit low for this maby a practice amp?
i consider such amps to be part of the instrument, sound wise, the nature of this type of amp and their particular colourations evolved alongside the guitar itself IMO.
solid state amps (even the ones designed for guitar), are still not liked by some. it took a good few years before solid state amps were accepted at all, must be hard to design them to have that particular sound. (or colouration which ever way you look at it).
the JLLH classA was designed as an hi fi amp, ie minimum colouration.
of course i may be wrong
🙂
i did not say that the- "JLLH is a low powered Class A amplifier"
what i did say is- "the JLH class A is not suitable for guitar amp, it is a low power class A hi fi amp"
the distinction is the hi fi bit.
i am aware of the- "multitude of low-power valve amplifers that were the norm for guitar amplification"
i would have thought that 10 Watts would be a bit low for this maby a practice amp?
i consider such amps to be part of the instrument, sound wise, the nature of this type of amp and their particular colourations evolved alongside the guitar itself IMO.
solid state amps (even the ones designed for guitar), are still not liked by some. it took a good few years before solid state amps were accepted at all, must be hard to design them to have that particular sound. (or colouration which ever way you look at it).
the JLLH classA was designed as an hi fi amp, ie minimum colouration.
of course i may be wrong
🙂
Re: Well folks..... do a simple test
Dear Carlos
All I'm trying to say is that I don't experience muffled trebles or loss of dynamics.
My pre-amp doesn't have tone controls, with flat FR from about 10Hz up to at least 85kHz, my amplifier's FR is also flat from 10 to more than 400kHz. My experience with a lot of amps are that the trebles can get harsch at higher volumes while I do not experience any harshness with my class A amps.
Regards
André
destroyer X said:
Dear Carlos
All I'm trying to say is that I don't experience muffled trebles or loss of dynamics.
My pre-amp doesn't have tone controls, with flat FR from about 10Hz up to at least 85kHz, my amplifier's FR is also flat from 10 to more than 400kHz. My experience with a lot of amps are that the trebles can get harsch at higher volumes while I do not experience any harshness with my class A amps.
Regards
André
Hi Carlos;
your topic's name confuse people so they think you generalize as if class A is the cause of muffed treble, while you are speaking of particular amp design used with particular speakers.
your topic's name confuse people so they think you generalize as if class A is the cause of muffed treble, while you are speaking of particular amp design used with particular speakers.
Hi Eva
What do you mean with "exotic way"?
Can you give us an example of a typical bad construction with this behavor in klass A?
Is klass A in general harder to construct for low outputimpedance and to bee insensitive for diferent speakers?
regards
What do you mean with "exotic way"?
Can you give us an example of a typical bad construction with this behavor in klass A?
Is klass A in general harder to construct for low outputimpedance and to bee insensitive for diferent speakers?
regards
Eva said:
Re: Re: Well folks..... do a simple test
One man's lack of harshness can easily become another one's "mufled treble". Getting rid of crossover distortion is not always good 🙂
Andre Visser said:
One man's lack of harshness can easily become another one's "mufled treble". Getting rid of crossover distortion is not always good 🙂
Observe this one.... not because it is mine...but because not mufled
And using the same speaker i have tested the Class A...the last one i have tested and tweaked... the one was the reason to create this thread.
Observe no mufled...also many others i use to play here do not play mufled trebles.... Symassym is not mufled, Techno (from Bora) is not mufled, GEM is not mufled, Aksa is not mufled, also HRII is not mufled...the clone i have made from the NAD3020 is not mufled and no chip amplifier sounded mufled.
So..it is not my speaker, nor my tweater, nor my computer, not my audio source, not my music, not my house, my wife, my dog and not my ears.
It is easy to perceive differences of sound when you compare... and also is hard to know if something is good or not, if mufled or not without comparison..... i think, or i feel, without comparison is no scientific.... humans have not that competence.
Listen this DHR Turbo recording......observe that digital cameras cannot record high frequencies without losses... even this way you can perceive not mufled.
http://www.youtube.com/watch?v=GE5EjMSqvMI
regards,
Carlos
And using the same speaker i have tested the Class A...the last one i have tested and tweaked... the one was the reason to create this thread.
Observe no mufled...also many others i use to play here do not play mufled trebles.... Symassym is not mufled, Techno (from Bora) is not mufled, GEM is not mufled, Aksa is not mufled, also HRII is not mufled...the clone i have made from the NAD3020 is not mufled and no chip amplifier sounded mufled.
So..it is not my speaker, nor my tweater, nor my computer, not my audio source, not my music, not my house, my wife, my dog and not my ears.
It is easy to perceive differences of sound when you compare... and also is hard to know if something is good or not, if mufled or not without comparison..... i think, or i feel, without comparison is no scientific.... humans have not that competence.
Listen this DHR Turbo recording......observe that digital cameras cannot record high frequencies without losses... even this way you can perceive not mufled.
http://www.youtube.com/watch?v=GE5EjMSqvMI
regards,
Carlos
DHR Turbo
Further information about the amplifier featured on "youtube" may be seen at http://users.tpg.com.au/users/gerskine/dxamp/
SandyK
Further information about the amplifier featured on "youtube" may be seen at http://users.tpg.com.au/users/gerskine/dxamp/
SandyK
Wavebourn found the thread title confused.. and was clear
All class A i have tested resulted mufled since the sixties.
No my dear Wavebourn...i am terrible sorry...i am talking about all units i have tested...and they were many...some from industries and the big majority made in my own home.... a lot of different speakers were used, i have also lived many homes and my ear was young, mature and now a days an old ear..... i have asked help from women , young folks and kids to avoid my ear fool myself.
As i told you, this does not means sounded bad.... in the reality no one of them sounded bad...all them sounded very good or even special.... Class A amplifiers, in my mind, are the good ones...but...because of many reasons i have exposed into this thread...i do not want them anymore.
You can go ahead and love them deeply and perceive them the way you want, the way you can, the way they are, or the way your illusion will create for that sonics...we listen with brain... decisions exists..beliefs, brands, how looks, how expensive is, how powerfull is..how much famous is...so....there are ears plus conscience, plus brain decisions and subconscience acting same time.... the first seconds you will not have all those "brain departments engaged" and you will listen the real thing.
To stay for too long listening will make you ears plus brain adjust the whole thing.... reason why people can perceive basses into 2 inch speaker playing using battery portable radio, AM broadcasting that does not has low frequencies...and even this way the guy ensure you that he could listened the bass (was his memory..musical memory that added that bass).... he have listened some "tóc" sound into the portable radio speaker and he have translated (perceived, listened,understood, recreated, processed, post ajusted, sound generated inside brain..) to Thum, thum, thum!
No class A will sound mufled, at least you have other type of amplifiers to compare into A to B testing...you can have a Class A and listen to it whole life and will perceive absolutelly nothing...but if you do the test things will be clear to you too.
When i said class A amplifiers...... i am talking about the power unit...the CD player or audio source entering directly into the power amplifier input.
I am not talking about "integrated systems"...the ones have pré amplifier inside the cabinet (enclosure, housing, case)....having pré amplifier you may have different results because of the pré amplifier... result came from the system, not from the power amplifier.
Of course this can be corrected increasing the treble just a little.
Test A to B is done using an H to H guitar switch, two positions, the one is use to reverse... 6 pins, two position.... or an A to B stereo switch.
The idea is to switch a single speaker... only one speaker...mono testing...only one channel into TWO amplifiers.
Those amplifier are adjusted into the same power level and they receive the same audio input (paralleled coaxial audio input cables)....
A operator will switch from A to B amplifier....you cannot know the one is playing...you cannot know amplifier A brand, or how it looks....it is blind...you just listen and knows nothing... even if you are comparing class A with Class AB..... and doing that by ourselve we are already, in advance, poluted by our beliefs and this will modify a little your results.
The operator goes switching musics..... many styles.... and telling you.
- Now it is "A" playing
- Now it is "B" playing
then you will perceive clearly that all them are different.
You can change speakers too...one test with speaker "red" and other complete test with speaker "green"...but do not mix those things not to confuse testing.
Wanna know differences into power amplifiers....power units only will be used...if you use one power and another having pré amplifier the result will not be fair and you will be comparing watermellows with beans.
You can leave all life married with a 7 feet tall woman... with a 60 centimeter feet and 450 hundred pounds weigth lovely blond woman and perceive her as beautifull.... gorjeous!
BUT... i think this may happens because you have never gone outside your home, your farm, your country site or your mountain home...if you visit other countries you will see women different... and some of them may be even more beautifull than your wife...
Only comparing.
Having an equipment and not producing comparison...you will not even know if it is really good or not.
I do not use to produce pictures because it is a real mess of wires and equipment into the table... a shame...and also because there are a lot of technological neurotical folks that will be scandalized (shocked) with my old rusted switch and they will start to say one channel can be different because of the switch, or my cable...well... the ones do not want to know...the ones prefer to be inside a dream or illusion.... they will hate the possibility to see the things the way they are... and they will do all they can to send trash over my test system.
Carlos
All class A i have tested resulted mufled since the sixties.
No my dear Wavebourn...i am terrible sorry...i am talking about all units i have tested...and they were many...some from industries and the big majority made in my own home.... a lot of different speakers were used, i have also lived many homes and my ear was young, mature and now a days an old ear..... i have asked help from women , young folks and kids to avoid my ear fool myself.
As i told you, this does not means sounded bad.... in the reality no one of them sounded bad...all them sounded very good or even special.... Class A amplifiers, in my mind, are the good ones...but...because of many reasons i have exposed into this thread...i do not want them anymore.
You can go ahead and love them deeply and perceive them the way you want, the way you can, the way they are, or the way your illusion will create for that sonics...we listen with brain... decisions exists..beliefs, brands, how looks, how expensive is, how powerfull is..how much famous is...so....there are ears plus conscience, plus brain decisions and subconscience acting same time.... the first seconds you will not have all those "brain departments engaged" and you will listen the real thing.
To stay for too long listening will make you ears plus brain adjust the whole thing.... reason why people can perceive basses into 2 inch speaker playing using battery portable radio, AM broadcasting that does not has low frequencies...and even this way the guy ensure you that he could listened the bass (was his memory..musical memory that added that bass).... he have listened some "tóc" sound into the portable radio speaker and he have translated (perceived, listened,understood, recreated, processed, post ajusted, sound generated inside brain..) to Thum, thum, thum!
No class A will sound mufled, at least you have other type of amplifiers to compare into A to B testing...you can have a Class A and listen to it whole life and will perceive absolutelly nothing...but if you do the test things will be clear to you too.
When i said class A amplifiers...... i am talking about the power unit...the CD player or audio source entering directly into the power amplifier input.
I am not talking about "integrated systems"...the ones have pré amplifier inside the cabinet (enclosure, housing, case)....having pré amplifier you may have different results because of the pré amplifier... result came from the system, not from the power amplifier.
Of course this can be corrected increasing the treble just a little.
Test A to B is done using an H to H guitar switch, two positions, the one is use to reverse... 6 pins, two position.... or an A to B stereo switch.
The idea is to switch a single speaker... only one speaker...mono testing...only one channel into TWO amplifiers.
Those amplifier are adjusted into the same power level and they receive the same audio input (paralleled coaxial audio input cables)....
A operator will switch from A to B amplifier....you cannot know the one is playing...you cannot know amplifier A brand, or how it looks....it is blind...you just listen and knows nothing... even if you are comparing class A with Class AB..... and doing that by ourselve we are already, in advance, poluted by our beliefs and this will modify a little your results.
The operator goes switching musics..... many styles.... and telling you.
- Now it is "A" playing
- Now it is "B" playing
then you will perceive clearly that all them are different.
You can change speakers too...one test with speaker "red" and other complete test with speaker "green"...but do not mix those things not to confuse testing.
Wanna know differences into power amplifiers....power units only will be used...if you use one power and another having pré amplifier the result will not be fair and you will be comparing watermellows with beans.
You can leave all life married with a 7 feet tall woman... with a 60 centimeter feet and 450 hundred pounds weigth lovely blond woman and perceive her as beautifull.... gorjeous!
BUT... i think this may happens because you have never gone outside your home, your farm, your country site or your mountain home...if you visit other countries you will see women different... and some of them may be even more beautifull than your wife...
Only comparing.
Having an equipment and not producing comparison...you will not even know if it is really good or not.
I do not use to produce pictures because it is a real mess of wires and equipment into the table... a shame...and also because there are a lot of technological neurotical folks that will be scandalized (shocked) with my old rusted switch and they will start to say one channel can be different because of the switch, or my cable...well... the ones do not want to know...the ones prefer to be inside a dream or illusion.... they will hate the possibility to see the things the way they are... and they will do all they can to send trash over my test system.
Carlos
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