Okay, MPC reviewed the similar Megaworks 6.1 in September 2003
http://www.maximumpc.com/reviews/speake ... 12-10.html
My guess is that MPC likes the sound quality of the Z-680s better, probably due to the sats:
"In our 20Hz to 22kHz sweep test, the MegaWorks’ new sub passed with flying colors, but we were a bit disappointed by the high-end response of the satellites. They stopped producing recognizable tones at around 19kHz."
MPC wasn't the only reviewer that complained about the treble:
http://www.techspot.com/reviews/hardwar ... ks-6.shtml
Comparatively average treble compared to the mid-range & bass performance. "
Thx IronbarSinister for the info on the MegaWorks 5.1s! Have yourself an avatar!