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Has anyone tried double CLS

I had posed this question before because I had two pair of CLS11Z speakers in a Home theatre set up that I wanted to find a way to stack.I had just been feeling a loss of music after I sold my stacked pair of esl 57, and was curious about stacking the CLS. Would the bass improve as much as it did when the Quads were stacked?The similarity between the two speakers was that each speaker was bass shy and that attempts at sub-woofing never really were sucessful even after trying the Depth.So after seeing coverage of the RMAF and of the Kimber/Soundlab set up I decided that if they could double up the Soundlabs side by side,why couldn't the CLS be run that way?I was also bolstered by the fact that when my friend Tony went from three to four panels per side the sound from his Acoustats really improved.It is a shame that Martin Logan gave up on the CLS and went the hybrid route,because all they needed to do was increase the panel size.If Mr Saunders can get his hands on a couple of pair of CLS and wires them to a good amp in series he will hear that a lot of problems with the original CLS disappear.Maybe it will even change his priorities,so that great uncompromised sound and not floor space rules.
lacee

Showing 1 response by triodeotl

triodeotl's avatar
triodeotl
9 posts
 
No I have not tried that but it would be interesting to try if a person had two matched pairs.

Since the CLS panels are mirror imaged you would not want to stack them but put them side by side. One right channel with one left channel edge to edge (side to side).

I would put the narrow side of the panel side by side (to the inside of the stereo channel pair) so that they would physically be the center of the double pair.

Then what you would want to do since you would now have two power supplies per side is to wire them in series for the speaker connection from the power amp (amps).

The hot connector from one of the speaker terminals connected to the ground of the other speaker terminal on each power supply for that pair. A long jumper could be used for this purpose.

Then you would want to connect the speaker cable (from one channel of) the amp (amps) to the hot (red terminal) on one power supply and the ground of the speaker cable (from one channel of) the amp (amps) to the ground terminal on the other power supply.

This would raise the impedance of the CLS speaker PAIRS up to about 3 0HM’s and should make it fairly easy to drive for tube power amps or whatever you are using.

Both power supplies would of course need to be plugged into the wall for AC connection for each speaker pair.

I think that it would work but the only drawback is a wide room would be necessary to accommodate both stereo pairs.

If you are not familiar with series wiring here is a link that shows how it is done with raw drivers.

http://www.bcae1.com/spkrmlti.htm

If you do try this report back and report the results.
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