No I think you understood correctly. But as I said: I'm a mechanical engineer and in my branch there are differences if I want to control a slim "signal" or a broad one. I just applied that to electronics. (for fun and totally OT: Construction of a mechanism for water flow control. It's totally different if I want to regulate between one drop, two drops, three drops (per timestep - difficult) or between one litre, two litres, three litres (per timestep). And now I am able to choose - which one do you guess would I pick to construct 😉 )
May be different with electrical components. Maybe you are right and potentiometers perfect to such a grade that it doesn't matter.
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ofcource it won't sound the same With 3 watts as it does with 200.
but i was not comenting your post. i was commenting about hearing the sound from the speaker With so low Power that the cones are not moving. that is just not possible.
Compatibility maybe? One can always lower the volume if one has "too much gain". But a customer which can't get it's terminal volume loud enough is unsatisfied. "Build for every case (or most possible)"
Sorry, we are typing faster than I can read and follow. I started this brnach of discussion with
I was imprecise with my words. I meant "which JUST NEED a certain amount of spinach to sound as intended"
okei. try driving a First Watt F4 to clipping with that 2V p2p.
there are many amps out there that need more then 2V p2p. and CD player as Source is not a good example now in 2015. most people use streaming of some kind. there is often low levels on streaming/downloded files. even on CD recordings.
re: post #94
Let me say first... I'm not an expert. I don't understand, among other things, "...why they use, say 100K pot before gainstage and 10K after gainstage". It has no ring of familiarity.
I am glad to see Leucetius describe " sweet spot" that I brought up yesterday.
I don't have enough information to make a conclusion on #94. Dynamics-destroying pots seems unlikely. The consistency you see may result from 'Makes no difference; we'll stick to tradition' layout attitudes.
Let me say first... I'm not an expert. I don't understand, among other things, "...why they use, say 100K pot before gainstage and 10K after gainstage". It has no ring of familiarity.
I am glad to see Leucetius describe " sweet spot" that I brought up yesterday.
I don't have enough information to make a conclusion on #94. Dynamics-destroying pots seems unlikely. The consistency you see may result from 'Makes no difference; we'll stick to tradition' layout attitudes.
Sorry you are adding variables that i cannot answer Never had classA amplifiers never liked the sound of Pass amps ... ( sorry for that )
Also in this post some things are given to avoid generalization sources are known CD players and amplifier is known typical class AB CFp with 24K input imp. and so on driven with 0.7 volts i think
But there is a small contradiction in what you say versus my question
If for any reason the amplitude of your source is not enough then a buffer will not help you remember B1 ( device as a known example here) has no gain then you are in the case you need an active stage with some gain at least ....
so we are back where we started
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Interesting but an answer and explanation of post 94 will solve the issue immediately so your reply is welcome but didn't help much
and a small correction according to my opinion:
I never said that the pot it shelf is destroying the dynamics
I said that when the pot is set to as low as 100R or even less for low listening level then the next stage of my amplifier brought down to 100R from ground is not capable of producing the same dynamics next to a case where the this stage will be always 22K above ground .
( which is absolutely equal to the example given in post #94)
May be plain stupid, but since you are certified with/for a few manufacturers - ever asked them?
Ask them what ? for something i see as a standard practice over 30 years now
The structure of a consumer integrated amplifier normally is
-- a phono stage or not with gain enough to a line level signal
-- a selector switch between line inputs
--probably a tape monitor circuit for recording use
--and after that you have the combinations we discuss here
1) passive till the amp
2) a pot after the selector driving a buffer or preamp then to the main amp
3) a buffer or preamp after the selector then the pot and then to the amp
4) possible combinations of 2-3 including a tone control stage either in the preamp or as a separated stage
I will support that the cleanest you will ever get will be the passive one
Only noticed that in very low listening level passive sucks so i wanted to discuss with you why this is happening
do not mix up buffer with gainstage. those are 2 differet things.
the question you asked was why put another gainstage after the CD players gainstage. a buffer is not a gainstage.
Still i could do that only with Xindak they are very friendly people CAV too i may as well place a question to Advance Acoustic since the designer works in France so a may have access there for Teac i see it as pointless i think .
You have an active brain my friend
All your suggestions was a hit tonight thank you !!
You have an active brain my friend
All your suggestions was a hit tonight thank you !!
you are wrong
in post 94 i said clearly since the output of a cd player has already a gain stage ( capable enough for driving normal amplifiers ) why add a buffer in its output then a pot then the main amp
here you ask. why put in a gainstage after the CD players gainstage.
my answer had nothing to do With post#94
i am not confusing a buffer with again stage ...my answer was targeted in the case that the source's amplitude was not enough to drive an amplifier with a passive pot that has 2.2+ volts of sensitivity
In this case there is a loss of dynamics that will be audible at low power as the buffer gain is typicaly 20db to offset passive tone controls attenuation.
I stand corrected for this i hope you understood that i was referring to the configuration of having a CD player as a source B1 buffer after that , a pot after that and then teh main amplifier
Wahab welcome ...
Tones was never the issue here exclude them
we take as a fact that tones have their own stage to make things quicker
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