I meen that you need to have a matched set no matter what you buy. You want all the front left, front right, front center speakers to be very close in performance with the center speaker perhaps having a little more power handling cappacity. The two rear speakers can have a little less low end responce than the fronts but all of the speakers need to have the same frequency and dispersion patterns. There was a trend a few years ago to use "rear" cabinets that had a figure 8 patern. They were placed on the side walls just behind the main listening position but not on the back wall. They seemed to spread the sound field more but lost some of the localization in the rear channels, they worked really well with sound field generator circuts to simulate listening in a variety of envirements like a concert hall or jazz club. The important thing is that all the speakers, other than the subwoffer of course, sound identical but you can allow for a little less base in the rears
Allong with the dimention ratios I will also dig up some suppliers of wall treatment products to help control the reverb field. I think one of them might have a computer program that taken the dimentions of your final room design, funiture placement and equipment layout could recomend what specific modules to use and where to place them. I saw this in one of the home recording mags.
Grayson
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