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Old 4th August 2005, 04:09 AM   #1
diyAudio Member
Join Date: Dec 2002
Location: dry ol Melbourne Australia
Default Amperes of Pass amps & Pass for ESL

I plannng a system that will have dipole bass, ESL mids (89 db panels from E R Audio in Perth Australia) and G ribbon tweeters. Active bass, maybe passive mid & tweets.

ESLs seem to be hard to drive mostly in the bass and at 20 kHz.

Iím considering a number of amps for the job, including
- a 30 watt Aleph kit,
- second hand 25 w Pass A-40 thatís just on the market locally

The (in this forum) heretical:
- Rod Elliottís MOSFET P101 or maybe P3A,
- a second hand ME (range 60-150 watts),
- a 25w Monarchy Audio SM-70 Pro (zero feedback in output stage),
- something else?

Iím soon to find out from E R Audio how many amperes he recommends.

* Who has heard a Pass amp driving ESLs ~ what did you think?

* What are the amperes current the various designs put out?

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Old 4th August 2005, 06:04 AM   #2
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Join Date: Aug 2003
Location: Long Island, New York
I don't think the Aleph 30 is well suited to drive electrostatics nor are any of the amps you mentioned. Being totally honest, a pair of Aleph 2's @ 100 watss per channel would do a nice job but a pair of Aleph 2's will cost about a $1000 to build when you figure a pair of 750 VA toroidal transformers, heastsink material, 24 matched output devices, 2 matched diff pairs, circuit boards and their parts, chassis etc. I have a pair of Martin logan electroststics at 88 db/watt and find the the aleph 2 is just right because the impedance dips a bit in places.

PS: There is no such thing as an Aleph Kit. With an Aleph you download a schematic, either design your own boards or maybe buy some from members of the forum in a group buy, find the rest of the parts and you are on your way.
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Old 4th August 2005, 07:20 AM   #3
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Join Date: Dec 2002
Location: dry ol Melbourne Australia

(Aleph Kit - I should have said group parts & group PCB buys)

Iíve heard from an ESL supplier that a 60 watt class A does a good job, though he also thinks a NAD adequate (me sceptical).

Your Martin Logan has passive crossovers I assume? Even for *just the mids - 100 watts?

What is anything good and reasonably affordable??
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Old 4th August 2005, 03:28 PM   #4
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Join Date: Sep 2003
Location: Paris - France

* Who has heard a Pass amp driving ESLs ~ what did you think?
I have a A75 driving my Martin Logan Aerius i and it's wonderful ...
The Aerius i go low at 1.7 Ohms > 15kHz

* What are the amperes current the various designs put out?
It's 2 channel * 2 * 12 IRF in TO3 and more than 70 amps output



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