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Old 3rd January 2006, 08:35 PM   #21
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So putting cost aside this amplifier as designed originally is a low
distortion high fidelity one but to give us an idea of how good its
sonics are it should be compared subjectively to other designs i
would be most interested to see how it compares in this respect
to dartzeel, pass, and mikeb's symasym

cheers
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Old 3rd January 2006, 11:07 PM   #22
AKSA is offline AKSA  Australia
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Emtech,

I believe you can take Rellum's comments as gospel. He is well known to me, and utterly reliable, as is his friend, Hubert.

From my knowledge of amp design, which is very highly subjective, I believe I can say the amp would be extremely clean, reasonably fast, and neutral. More than this I cannot say.

There comes a time when you have to build these things.......



Cheers,

Hugh
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Old 3rd January 2006, 11:20 PM   #23
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Quote:
Originally posted by AKSA
.....
From my knowledge of amp design, which is very highly subjective, I believe I can say
.....
Hugh
this is a most honest way to make a statement!


it is different to say:
I changed this component, and sound is now this and that

from saying:
I changed this component, and my subjective impression is, sound is now this and that

and notice one thing:
a subjective impression may very well be for real
if you hear more bass, it may be for real there is more bass in sound
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Old 3rd January 2006, 11:28 PM   #24
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Thanks again Rellum,

For your further valuable insight.

The issue you raised on the bootstrap capacitor drop in loop gain at very low frequencies is an inherent characteristic of the topology. The corner is currently around 5 Hz and down to 1 Hz with larger bootstrap C's so I can't imagine this affecting damping at 20 - 50 Hz. The gain is coming off quite a high base.

Hi Mastertech,

A/B/C comparisons are always interesting. Especially without bias.

Hi Hugh,

Agree wholeheartedly. The listening experience is the final arbiter, objectively on a neutral system where possible.

Not unlike my good mate's hearing aid.



Cheers,
Greg
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Old 4th January 2006, 12:10 AM   #25
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Lineup,

Those who know me say my comment is entirely in character. Like Greg, though from a different perspective perhaps, there is a clear honesty which is the essence of my business.

This is not to say that a highly subjective knowledge is inferior; quite the opposite, the subjective knowledge properly follows only once the objective knowledge has been absorbed. The engineering is fundamental, after all......

Greg,

I noticed your comments on opamps, and the conundrum of subjective listening tests. I agree emphatically, but I'd be interested to know if you feel you can measure and quantify these subjective differences, and if so, how?

It should be clear by now that I'm not actually against you; I largely agree with you, but am very interested in the subjectivity of human aural perception.........

BTW, if anyone here wants to get a handle on how my amp sounds, try these comments here: AKSA comments

Cheers,

Hugh
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Old 4th January 2006, 12:12 AM   #26
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Hi all,

Congratulations for all your electronical works, you are
great.

Forgive me for my bad English ...

I wrote this little review about Greg's amp by listen to Francis' prototype which, without any doubt, could (certainly will...) be improved with top power supply, different in/out impedances matches, potentiometer and on...

All IMHO:

Mastertech:
Macro-dynamic is the result of the ability of a component to reproduce transients from low to high spl.
Micro-dynamic: transients from low to slightly higher spl.
<<how is that defined scientificly?
*** 0 to first watt(s) for micro; first watt(s) to X-watts for macro.

Lineup:
To summarize: Foundamental notes are transients; details are harmonics; micro-details are harmonics at low spl. If your cds have only high-level harmonics, so OK with your comments: "only a few cds have micro-details..."

My
I'm not an EE, you all are EE's; if I was one, I really would ask me:
Where am'I going with my Solid-States works?
Do I believe we are living with perfect recorded sources? with perfect speakers? in a perfect acoustical listening room?
Why do some guys sooo enjoy listening to SE-valves amps? Do I still believe they are enjoying a large amount of 2nd harmonic distortion or micro-reverberation valves' effect? If they allways link their 5 watts pair to high efficient speakers, is it to listen at high spl levels or to catch something else? What is the real relationship between technical parameters and the intrinsic essence of the emotion when listening to music in my domestic environment? So, do I believe straight wire with gain really is the goal?

Don't me, remember my first words.



Hubert
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Old 4th January 2006, 03:09 AM   #27
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Quote:
Lineup:
To summarize: Foundamental notes are transients; details are harmonics; micro-details are harmonics at low spl. If your cds have only high-level harmonics, so OK with your comments: "only a few cds have micro-details..."
You must have mixed me up with somebody else.
I would never use expressions like micro-details.
Unlikely when it comes to sound of music.
Possibly I could talk about details in an amplifier.

And if we use microdetails, we have to specify
where is the limit to make a detail into a micro-detail.
What is the size of a micro-detail?
And what unit would we use?
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Old 4th January 2006, 03:21 AM   #28
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Hubert-
I'm not an EE, you all are EE's; if I was one, I really would ask me:
Where am'I going with my Solid-States works?
Do I believe we are living with perfect recorded sources? with perfect speakers? in a perfect acoustical listening room?
------------------------------------------


where are you going? tell us, youve made a point but you have
confused me, you say youre not EE, as a reviewer you should at
least tell quality what is it you see as such in an amp, i would be
very interested if you could share some insights into this as a
manufacturer i always listen to reviewers at the end of the day
they make a judgement on some form of quality, please do
comment much appreciated


" Hi all Congratulations for all your electronical works, you are
great. "

thank you very much
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Old 4th January 2006, 09:15 PM   #29
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Hi all

Linup, post11:
Quote:
Lack of some inner details is no big problem for me.
I said my english/american is bad !: "micro-details" = "inner-details".
But you are right, pointing out that the frontier between details and micro-details_ oups, my mistake_ inner-details isn't defined, at least scientifically; so, may I suggest that inner-details could be defined as frequencies which are almost the same than others, i.e. 440, 480, 500, 530 hz, reproduced at the same time and at low spl, WHILE other frequencies i.e. 1200, 1900, 3500hz are reproduced at higher spl...real IM issue...

Mastertech:
Quote:
where are you going? tell us, youve made a point but you have
I'm going to try to let you know my thoughts about reproduced music IN A DOMESTIC ENVIRONMENT; These are my thoughts and I fully agree that others could be totally opposed to my views...

If I am looking at the complete reproducting system, what am I seeing?
1) a different place (my listening room) than the recorded place (as different than i.e. a church, a concert hall, an open-air area and on). The problem here is not that my room don't have the same sizes, same reverberation factor and on than the recorded place; the problem here is that the stereo principle does not take into consideration the acoustical properties of my listening environment. It is an almost perfect principle only for and in itself.
2) audio manufacturers acting and hardly working on technical features, with the goal to perfectly enhance the technical features needed by the stereo principle.
3) almost nobody asking himself what is the goal of the MUSIC?

I will stop here because the purpose is to point out that reproduced music isn't only for me the accurater transposition of an audio event into my listening room. My goal when listening to recorded music is to enjoy it the best possible by getting the emotion included in the opus.
Straight wire with gain isn't able to plenty satisfy me because my environment doesn't allow me to listen at realistic level: I have a family, neighbors, and my listening room isn't in open air.
Obviously I need accurate and non tiring components, but it's not enough.

Emotion for me comes when ( yes, with good cds, I am not asking for miracles) a system is able to let me really "fall/plunge" into a surrounding musical volume even at low listening level. This needs airy sounds, certainly a physiological fr-range and huge amount of inner-details capability.
My current tweaked Rogers E40a, a classA double push-pull 6L6 integrated gives me almost satisfaction at the moment. Unfortunately I did not find a solid-state that gives me the same pleasure; I listened to Hugh's AKSA 55w nirvana+ and evidently to Greg's SKA: Both have huge qualities, certainly no high priced commercial stuffs I listened to were better. However, even if my tube has more distortions, they are less important for me than its qualities.
I really hope it isn't a matter of tube vs solid-state techs.
As a (very modest) speaker diy guy, I believe particularly in one tech feature...I don't know if you, E guys are working on, but...could time-domain issues be one key?
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Old 4th January 2006, 09:34 PM   #30
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well without any feelings being hurt how do you compare the ASKA to the SKA ?......I am into heavy loud music,and dynamic HT...My favorites are Rob Zombie, Judas Priest, SOD etc....My speakers are going to be RAW acoustics RA8...I previosly ran the H/K AVR 8000(thier best offered) and Definitive BP10B's.....I am not an audiophile obviously LOL
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