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putting foam on the walls will create an EQ that is biased toward high frequencies, damaging the response of an otherwise good speaker you may have bought.
Very dumb question here: why would foam absorbers create EQ biased towards high frequencies? Wouldn't foam absorb high frequencies since their wavelengths are so short, while allowing lower frequencies to pass through and reflect off the walls? In other words, if absorbers are generally ineffective for absorbing bass because the wavelengths are too long, then why would absorbers make a room sound more trebly?
Also, if one doesn't have coaxial speakers, wouldn't a couple of ceiling panels about halfway between the speakers and the listening position help even out the off-axis response?