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Old 25th December 2006, 08:47 AM   #1
Leolabs is offline Leolabs  Malaysia
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Question Help to improve

When someone said that your amp perform not so good when listen to classical music(not so detail,blur up),what is the weakness of the amp and how to improve assume that the amp is a:
1)complementary BJT amp

or

2)chipamp like LM3875 GC

?????????????
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Old 25th December 2006, 09:18 AM   #2
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I can think of many reasons to this problem.....

It may be frequency responce and/or to low slew rate......

Listen to rock music, it can be hard to tell if the guitar should sound slightly distorted or not, however in classic music instruments are rarely played distorted!

I have a test cd with all frequencies and many acustic instruments plus live recording of common sounds from the real life (thunder, trains, jetplans etc) which I use together with a few selected music cd's to test performance of my amps
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Old 25th December 2006, 10:05 AM   #3
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Like ACD said, it could be many reasons.
You can check the +/- rail supply (relative towards ground). Use osciloscope, in AC mode, to see how it looks like when the amp is playing music in average loudness.
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Old 26th December 2006, 12:49 AM   #4
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Assume that the power supply section and all layout,wirings are ok,where to start???
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Old 26th December 2006, 12:54 AM   #5
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Quote:
Originally posted by Leolabs
Assume that the power supply section and all layout,wirings are ok,where to start???
with more efficient spks?

then with smaller amp........


frankly-if you are sure that layout is OK (at least with widely common project-amps,so you can compare it with other's xperience ) then problem is most offten in amp-spks-room-listenning habbits........... combination
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Old 26th December 2006, 02:25 AM   #6
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Hi Leolabs,
Not all amps are created equal, tube or otherwise. So your question is far to general to bring useful answers. I listen to classical with tube and solid state, no problems but they do have different sounds.

So, what is the make and model of your SS amp?

-Chris
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Old 26th December 2006, 05:34 AM   #7
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I looked at your question
Quote:
When someone said that your amp perform not so good when listen to classical music(not so detail,blur up),what is the weakness of the amp and how to improve assume that the amp is a:
I may be wrong here . I know one thing that ordinary people (maybe the one who commented on your amp too) said "detailed" or "fast" amp, usually they refer to amps that technically not perfect.
A little TIM or a little clipping behavior is desired to get the "detailed" or "fast" effect. An amp with bootstrapped VAS (where the output swing can exceed the rails, ie : making half output stage clipping), can be said have better details.
A good designed amp (low thd, no clipping in output stage, input stage can handle all signals without clipping) may sound boring if other gears (signal source, speakers) are in ordinary average quality.
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