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In Reply to: RE: ESL 2812 vs ESL 57 posted by Tube747 on April 13, 2017 at 13:42:39
I can't speak to the 2812; however the '57 needs to not see over 30 volts- so your 50WPC Plinius should work very nicely-
Yes the '57 goes down to ~2 ohms in the bass - but ideally you would use a '57 with a sub cutting over at 100Hz....
Happy Listening
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Not many subwoofer has the speed to track the Quad ESL at 100Hz.
Crossover at 100Hz is not really the right way to integrate a sub with the Quad.
Let the Quad run full range and blend the sub in around 40Hz. Even a modest sub set-up this way will blend nicely with the Quad.
Original Quad ESL impedance - not all that low in the bass frequencies; treble is another matter
See the graph, which is from http://www.audiomisc.co.uk/57and303/interact.html
If you install the Zener boards from Quads Unlimited, you can use high power amps with the original Quads without worry.
That said, I've found that they seem to work really well on good amplifiers of around 50 watts. I'd bet that Plinius would sound great.
50w for single Quad ESL 57 or stacked Quad ESL wired in parallel?
I've used a 50 watt @ 8 ohms / 100 w @ 4 ohms solid state amplifier (Forte 4a) to good effect on a single pair of original Quad ESL's which have the Zener Protection Boards in them for over a year. I have recently changed over to a Harman-Kardon Citation II which offers 60 watts per channel.
I use the Quads in a small room, and I get satisfying volume levels. Of course one man's satisfying volume level is another man's background music....
I've measured 100 dB maximums in this particular listening room from the Quads.
The limit of single ESL 57 is 30v, what about stacked Quad ESL wired in parallel. Does it double the figure to 60v?
I've read that stacked ESLs should be run in series.
No.But all of this maximum voltage, etc., is a thing of the past. We now have protection circuits that will allow use of ANY amp with the original Quad without fear of damage. I use 300 watt tube amps with mine.
Edits: 04/13/17
IMO, an amplifier can drive the 2812 shouldn't be aproblem to handle the 57.
This is not a question of amplifier stability, etc., this is a question of maximum input voltage for the ESL-57.
The user should install the protection boards in the ESL-57 if they are not already there. This will allow use of any amplifier no matter the voltage swing.
No ESL-57 as produced from the factory will have the protection board. This was made available after production ended for the speaker.
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