[orientalexpress]

just curious,how to do it proper way.

lapsan

[jaywills]

You might start here:

http://www.integracoustics.com/MUG/MUG/tweaks/quad/hey_you/stacking.html

Cordially,

[BobRex]

Given the design of Quad 63s (large point source), stacking would place equally contributing points roughly a meter apart.  The resulting image would be very confusing.  Stacking the older 57s works, but that's because the panels are strips, and therefore the result is a small line source.

[Atom666]

http://quad.hifihaven.com/model/ESL-63/article:Quad-ESL-63-stacked-by-Stewart-Penketh

[BobRex]

This is more than just "stacking" -  this is a rebuild that requires a rewiring of one of the sets to eliminate the majority of the delay line.  If I'm looking at this correctly, only one power supply is used, what's the impact from that?

The bottom picture shows the stacked 57s.  The major difference is that you can easily separate the stacked pair, and be back to "original" status.  That's not the case with the 63s.

[Jazzman53]

This is more than just "stacking" -  this is a rebuild that requires a rewiring of one of the sets to eliminate the majority of the delay line.  If I'm looking at this correctly, only one power supply is used, what's the impact from that?

The bottom picture shows the stacked 57s.  The major difference is that you can easily separate the stacked pair, and be back to "original" status.  That's not the case with the 63s.

If I'm reading it right, you're right.  Since the panels are driven primarily by voltage (not current), I would guess there would be no problem with using the single power supply.  In fact my experience is that more amp power is drawn in driving a smaller size ESL to a given SPL than a larger one.  However, the capacitance added by the greater panel area could roll off the top end of the treble, although the roll off could remain in the ultrasonic region, in which case you wouldn't hear any difference.  I'm at work at the moment so no time to digest this modification in depth... sure looks interesting though.  And, BTW; with ESL's, bigger is definitely better!