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In Reply to: RE: Any experiences with different caps in the Prometheus posted by doughter on August 31, 2008 at 04:24:01
I've spent a lot of time playing with a room analyzer, my subwoofer placement and settings. My experience may not apply to your room but here's what I found:
I used to have the crossover at 10:30 or 11:00 (on the previous plate amps, not the current SAM2s). The analysis mic and software showed that I had a hole at the integration point between subs and main baffles. It's easier to setup the subs this way because you can whack up the bass level to get great deep bass but I was missing upper-bass as a consequence. I now have the crossover at about 2:00 and the level much lower. This excites room modes far less and lets me hear whole bass lines that I'd been missing, timing is better too as my troublesome room modes are pretty much fixed. The graphs I have for the bass response are really quite good now.
I'm also trying digital eq on just the bass feed on my now optimized subs, this really is the icing on the cake.
I have a behringer EQ (collecting dust) that I tried separately on the bass but I think it was messing up the sound somehow. I think I should buy the mic for it and do my own room analysis.
I found that turning up the crossover point did ruin the imaging somewhat as Robert has written about but I'll try your low volume method tonight and see how it sounds.
The XTZ mic & analysis software allows me to much more accurately understand the bass response than the Behringer does. It think it's vital to have a good sub setup before using the Behringer. Also Behringer recommend not using the RTA below 100Hz because it's not accurate (for some rooms), I'm guessing this is due to room modes and because they only use a single mic position.
I found that when the subs are setup to not have a hole at the sub to main baffle integration point, setting the sub level becomes incredibly sensitive. 1mm either way kills or floods the bass.
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