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i'd planned on doing a modification like this for a while, and since my rear speakers developed a bit of a rattle a while ago (which i was unable to fix; i think the driver itself went bad) and i finally had enough of it and decided to buy a proper 5-channel matched setup, and the new speakers were definitely too big, since the rears are bigger/heavier than my old fronts.
so, this way I have some pretty nice stands (with cable routing) which can actually support decent speakers and have great isolation, but didn't cost much at all (basically $62 for all four, plus a bit of time for assembly)."
click here for fluffy rant's step-by-step pictures.
other audio visual hacks:
> a hip mobile music console
> the very clever audioasylum lack table music cabinet