How many channels would you want a sound field DSP to support?
1-2 - one stereo pair
3-4 - two stereo pairs front and back
5-6 - three stereo pairs
5-6 - two stereo pairs, centre and subwoofer
7-8 - three stereo pairs, centre and subwoofer
>8 - in every panel a speaker!

Imagine that you only want to buy one box - don't consider the option of buying two four-channel boxes and running them side-by-side for eight channels.

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Owner of Mark I empeg 00061, now better than ever - (Thanks, Rod!) - and Karma 3930000004550