Krell KSA clone, Aleph J or AMB for Quad 57? - diyAudio
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Old 29th July 2014, 02:19 PM   #1
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Default Krell KSA clone, Aleph J or AMB for Quad 57?

I've got a pair of Quad ESL57 sitting in a smallish room 11x15 feet. I'm currently rotating EL34 PP, 300B SE and modded Naim amps through them. Each setup has its own rewards, though if I had to pick one, I'd go with the EL34 (Assemblage ST40).

I'm looking to try something new. OTL is out for now since the cost of tubes is a bit too much. The Aleph J is appealing as is a KSA K50 clone. Something completely different might be the AMB power amps. Anyone had a chance to compare any of these on 57s or other electrostatic?
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Old 29th July 2014, 02:33 PM   #2
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No idea what AMB is...

Krell = death, imo. Too hard and grainy for this speaker.

The Aleph might be ok.
The F5 implemented properly would perhaps be magic.
Can be made in the ideal power range, and does have extraordinarily nice sound.

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Old 29th July 2014, 02:40 PM   #3
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The F5 was on my consideration list. I was thinking about doing an Aleph and then doing an F5, just swapping out the driver boards.

AMB are these guys:
The β24 Fully-differential Power Amplifier

They do some cool DIY stuff that is very well supported. I have their DAC and it is pretty nice.
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Old 29th July 2014, 03:37 PM   #4
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Anybody have a link to evidence that shows you can hear the difference between amps in blind testing with equalized outputs?

Ben
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Old 29th July 2014, 04:12 PM   #5
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Do you want to open this can of worms?

And, please tell me how you would "equalize" outputs for amps with flat frequency response? The only place that amplitude EQ would have an effect is in the bass. We can skip the bass, and use them from midbass up, if you prefer?

Also can you cite any double blind tests that show that equalizers are inaudible?

move ahead folks, nothing to see here...

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Old 29th July 2014, 04:28 PM   #6
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I'm using an old Lazarus H-1A on my Quads - Best I've tried so far. It's a Class A - Hybrid design - Mosfets on the output. The "tubes" I've tried sound mushy in the bass. The Quads can take/use 50 "clean watts".

Charles

Last edited by stellavox; 29th July 2014 at 04:31 PM.
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Old 29th July 2014, 05:13 PM   #7
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Originally Posted by bear View Post
move ahead folks, nothing to see here...

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Really?

A pretty entertaining little article to read about a famous encounter. Granted, this particular event related to digital processing, it is fun to read. For the moment, I can't google Stan's article on amp testing - perhaps somebody can find it faster.

Boston Audio Society - ABX Testing article

The highly admired Stan Lipshitz (who has been a Quad ESL guy in the past) has shown in articles published in professional, peer-reviewed journals that once equalized, people are unable to make the judgments they sometimes loudly, even abusively, claim they can. In the link to the Boston Audio Society, the person being tested is Tiefenbrun, the man behind the fine Linn brand.

Ben

Might be this article:

S. P. Lipshitz and J. Vanderkooy, "The Great Debate: Subjective Evaluation", J. Audio Eng. Soc., Vol. 29, pp. 482-491 (1981 July/Aug.)
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Last edited by bentoronto; 29th July 2014 at 05:36 PM.
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Old 29th July 2014, 06:08 PM   #8
Bigun is offline Bigun  Canada
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I suspect for some of us that even if we couldn't tell a difference, it's irrelevant because our hobby is to obsess over amplifiers - we simply wouldn't care about double blind testing stuff

In my case, I've found every amplifier I've built to sound different, in some subtle way.

I remember doing an internet search for comparisons between the F5 and Aleph and found a lot of folk saying they liked the Aleph. The implication was that the F5 was a bit too honest and at the end they wanted an amp to listen to music so the Aleph did it for them better than the F5. Sorry, can't remember where I read that, but that's the summary that stuck in my mind from what I found.
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Last edited by Bigun; 29th July 2014 at 06:11 PM.
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Old 29th July 2014, 06:30 PM   #9
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Originally Posted by Bigun View Post
I suspect for some of us that even if we couldn't tell a difference, it's irrelevant because our hobby is to obsess over amplifiers - we simply wouldn't care about double blind testing stuff
Yes, I'm busy obsessing over output impedance for my new home-brew headphone amp.

Years ago, I did a social-survey study of the 400 Highway System neighboring homes (similar to US Interstates) as the government considered different kinds of noise barriers. Funny thing, we found only one kind of noise barrier that consistently reduced the highway racket: the one you built yourself.*

Ben
*You may giggle at that result (unless you are a golden-ear), but it led to an obvious policy strategy... which, of course, was never adopted by Ontario.
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Old 29th July 2014, 06:38 PM   #10
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No, no, no. Please don't jack.

I'm interested in building a new amp for Quad 57s that is different (topology, sound, heat dissipation, aesthetics, blah blah) from the ones I use. I am interested in DIY Class A because I've never built one before. If you have had one or more in an ESL setup, I'm interested in your opinion.
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