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Old 18th November 2009, 09:36 AM   #31
rabbitz is offline rabbitz  Australia
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I have OCD, so the amp and designer matches.
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Old 23rd February 2010, 05:53 AM   #32
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how would the AKSA sound on batteries?

how would i know if the mains really is causing the change in sound?
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Old 23rd February 2010, 07:35 AM   #33
AKSA is offline AKSA  Australia
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Kenji,

You would need six 12V SLA 6AH batteries; quite an investment. I have never tried it, as I always viewed this as impractical, too much invested in the batteries and the charger. You would still need large storage caps for earth return from the speaker voice coils, so all of the cost advantage is clearly lost.

But I've no reason to believe it would sound bad, and it may even sound better since PSRR becomes an irrelevance, whatever that means, of course!

Hugh
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Old 23rd February 2010, 08:12 AM   #34
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Hello Kenji

You should have said that you ask this batteries question because you ask me why the sound of your Aksa amp keeps changing, you say that one day it sounds very nice, next day or 2 days afterwards it not sound very good. And I've told you that maby it can be a noisy main problem.

Maby it's an electric motor or others noisy electrical apliances who run few day a weeks near your home.

You could try the felix main filter, here is the link:

Felix project


Bye

Gaetan

Last edited by gaetan8888; 23rd February 2010 at 08:25 AM.
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Old 23rd February 2010, 09:14 PM   #35
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hi Professor Hugh Dean,

can you tell me how effective mains filtering would be here? Or is it the shape of the mains supply which matters?

Professor Gaetan,

I've looked at the link. Could you tell me what the CMC is and does? What would be the best way to make this? Obviously because it's mains voltage I want to be very cautious about the construction.
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Old 23rd February 2010, 11:29 PM   #36
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Quote:
Originally Posted by Professor smith View Post

Professor Gaetan,

I've looked at the link. Could you tell me what the CMC is and does? What would be the best way to make this? Obviously because it's mains voltage I want to be very cautious about the construction.
Hello

CMC = common mode choke. It's an inductor or a choke with two windings in opposite directions to cancel electro-magnetic noise. You can find those in electronics parts stores.

The felix filter are a CLC filter. The capacitors are shorting the high frequency noises and the coil are have high impedance to the high frequency noises.

You should read that felix thread.

Bye

Gaetan

Last edited by gaetan8888; 23rd February 2010 at 11:57 PM.
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Old 24th February 2010, 07:06 AM   #37
AKSA is offline AKSA  Australia
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Kenji,

I suspect that a mains filter on your amp will bring consistent sound quality.

Absolutely worth a try. The mains system is heavily polluted with spikes in large cities. That certainly applies where you live.

Cheers,

Hugh
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Old 25th February 2010, 07:58 PM   #38
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Prof. Hugh Dean,

I have always been curious why you use the cd player that you do? It's an old model and newer dacs have come out which are reported to offer a much higher performance at low cost. Did you 'tune' the aksa to suit the sound of old cd players? I am finding that I keep coming back to these cd players and do not like the sound when using newer DACs.
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Old 25th February 2010, 09:14 PM   #39
AKSA is offline AKSA  Australia
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Lack of funds, I guess......

I find the CD player has much less effect on the sound than the amp and speakers.....

Perhaps we need to think about 'higher performance'? Are you talking measured, or perceived? If the latter, it's a matter of taste, I suspect. Most middle priced CD players are pretty good, anthing from the mid-nineties on, that is.

Hugh
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Old 25th February 2010, 09:24 PM   #40
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It took me a loonngg time to find a CD player that i didn't want to just toss out the door... far too many sound very artificial and ruin the entire system.

You should audition one of Joe R's BDP-83s you might change your mind

dave
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