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Old 27th September 2002, 02:15 PM   #1
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Default What amp best for ESL's..?

In the first place, I would like to say hello to everyone, since I am
actually a newbie here...now let's comne to the gist of the matter...
I can't listen to my (Densen B-100) amp anymore. It simply
doesn't cope withe my Martin Logan's. So there's the question...

What schematics...

Beacause now I have a lot of free time, I finally decided to
stop reading and start soldering some stuff, not afraid
of anything more complicated

My objectives are :
100 W / 8 ohm 200W/4 (Logans need some power)
Maybe it will sound a little bit stupid, but I want tu use the
best circuit available, not the second best (I mean, in terms
of *objective* sound quality)


Any Krell schematics, Maybe ML posted in the other thread would be ok..?
What about Erno Borberly Class A modules..? I must admit it appeals to me

Any suggestions...?

Thanks!!!

Adam
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Old 27th September 2002, 03:06 PM   #2
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http://www.headwize.com/projects/sho...lmore2_prj.htm
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Old 27th September 2002, 03:41 PM   #3
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Adam, I have also Martin Logan (SL3) and my advice here is: Use an amp with good ability to handle capacitve loads. Avoid amps with too much foldback current limitation (hard to know that maybe if you don't have the schematics before you buy the amp). My QRO amp can withstand 10 µF without a problem. I'm totally sure of the value. I tested this long time ago. My amp has also "vertical" current limitation (same current independant of voltage).

One other important thing is that the amp has little global feedback in the 1 MHz region and above. See the Leach amp for details.

http://users.ece.gatech.edu:80/~mleach/lowtim/

I forgot: Why don't you take a look at Mr Pass' amps since you are here? I imagine that they can take difficult loads, don't know that though, but I'm sure someone here knows more about it.
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Old 27th September 2002, 03:55 PM   #4
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Thanks Peranders for answer!

Currently I am using ML Scenarios, but planning to use it as rears
and buy SL3 for front (or maybe ReQuest's).

How does your QRO sounds with SL3...?
Why not Pass, hmm, I'd rather go for PP, not SE.
Are there any schematics for Aleph-X, which
are bridged SE (if memory serves)..?

Adam
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Old 27th September 2002, 04:42 PM   #5
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What about the version of the JLH amp for ESL speakers?

http://www.gmweb.btinternet.co.uk/jlhesl.htm

I haven't tried it myself, but's basically JLH'96 modified for higher current drive. I've tried the regular schematic with most of the mods detailed there through, and i can't praise the amp highly enough.
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Old 27th September 2002, 04:58 PM   #6
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Yes, JHL would be a nice idea, but I am not sure whether
33 V p-p would be enough for me (I am going to stay in
ESL's family for a while). Please bear in mind that I plan
to buy bigger ESL which are much more power hungry than
orginal Quad's...

I'll ask again - what about some Krell and ML schemas mentioned
in other threads..?

Best regards,

Adam
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Old 27th September 2002, 05:43 PM   #7
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Quote:
Originally posted by Lisandro_P
What about the version of the JLH amp for ESL speakers?

http://www.gmweb.btinternet.co.uk/jlhesl.htm

Call me a wuss, but I would not want to connect ANY speakers to a direct coupled amp with no protection circuits. A component failure can easily send the power supply current through the primary winding of the transformer in the speaker. Most transformers won't last very long with a few amps DC running through them.

MR
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Old 27th September 2002, 06:15 PM   #8
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Default Better safe than sorry

That's why I am trying to install the Vellamen Kit K4700 in the JLH for ESL
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Old 27th September 2002, 06:23 PM   #9
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Quote:
Originally posted by Adam
How does your QRO sounds with SL3...?
Hint: I have designed the amp myself. Can you guess?

Right, I am very pleased. The amp is switched on every day(almost), worked like clockwork since 1989. I have the TV connected to my stereo. Martin Logan + digital TV sound(NICAM) is cool.

Later I will make QRO Mark II public, future project (to some people: This is not an add!).

I have a feeling of that ML fits most amps except for those which are sensitive for capacitive load. I have seen a figure about the capacitance, is it 10 nF in ML?
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Old 27th September 2002, 06:36 PM   #10
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Quote:
Originally posted by MRehorst

Call me a wuss, but I would not want to connect ANY speakers to a direct coupled amp with no protection circuits. A component failure can easily send the power supply current through the primary winding of the transformer in the speaker. Most transformers won't last very long with a few amps DC running through them.
I totally agree! What happens when my older MOSFET amp (without DC protection of course) puts + 75 V DC out to my three 5" wideband speakers? Which happened three times!

The speaker will be destroyd in less then 3 seconds, fire smoke! SMELL!

My QRO amp has an advanced DC-protection (4th order Tjebutjev at 7 Hz, max DC 1.5 V and response time of <1 second. The protection circuits are fed from a separate PS in order to get an extra safe function but it's possible to feed them from the high driver voltage. +-80 V. This is one more reason to get complex.
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