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Use a recording with good natural depth to the sound-stage

as a test piece and listen carefully to your setup as-is, then with the treatment panels removed, then with them replaced one at a time. This should make clear if these are helping or hurting the sound-stage performance. If the panels don't affect the sound-stage, and there is little depth to it, then you have other problems such as RF noise that prevent you from hearing the effects of the treatments.

Another test is to clap your hands and listen to the room response before you remove the panels, and after. If you hear a sustained metallic ringing without the panels, then they are damping your slap-echo and you might need equivalent amounts of treatment but in different locations.

You might need some treatment behind the screen, where you would see your reflection if the wall were covered with mirrors. This depends on how reflective the screen is to sound.

If those are woofers in the ceiling, you might try disconnecting them from the amps and shorting their leads when listening to two-channel music. They will interact with the room sound and absorb certain frequencies. Shorting the leads will act like brakes applied to the cones.

For optimum bass from the Maggies, look into the Cardas formulas for speaker placement.


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  • Use a recording with good natural depth to the sound-stage - Al Sekela 16:32:39 12/15/06 (0)


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