Using Dipole Speakers in a Stereo System

I have a pair of ML Summits and hang thick, picture-frame style absorption panels on the wall behind it to eliminate/minimize the dipole effect. It is very effective, and you will get what you are looking for. You can "turn on/off" this effect anytime by simply placing/removing the panels.

In my set up, I use two 2' wide by 4' tall panel. They are oriented so that they are covering the back end of the electrostatic frame and not the subwoofer enclosure. The idea is to eliminate the dipole reflection.

You will get some effect by placing different types of fabrics or rugs behind your speakers. The best materials are those that absorb the sound and not those that reflect or diffuse them. Your best bet is to go to Lowes and buy two sheets of insulation (Roxul about 3.5" thick each) and place them behind your speakers. The plastic covering might reflect the sound, so you might have to open it. You can always return them after performing your experiment.

There are many finished acoustical panels available out there. Some of them can print pictures on the fabric cover to make it more room friendly. Mine are from Mix Master Acoustic, and I find them sonically and cost effective.

Let us know how that turns out.

That's good to know. You can also try doubling the thickness of egg style foam to see if it improves some more.

I think a higher density absorbing material will ultimately be your solution for the Odysseys if you are looking for further improvements. Several materials have been presented here.

On a separate note, what is the dB value of soft and loud volumes you are listening to? If you don't have an SPL, several apps can be downloaded for free. For me loud is 80dB or more, and the panels remain effective at minimizing the reflections. As you pointed out, the louder it gets the more effective the results.