In Reply to: Help with dialing in a System (LONG) posted by jeffmathers on April 18, 2012 at 06:10:39:
Well, we ended up getting an OmniMic (thanks to a kind soul on Audiokarma) and using REW to check out the room. It measured pretty good but clearly had a room mode at about 45Hz and a null at about 110Hz. See first pic.
One of our crew suggested changing the phase on the upper mid/tweeter unit. I still don't know how he came up with this idea - although he said that since the bass units were quite a distance from the mid/tweeter units it suggested a problem. We reversed the speaker connections on the mid/tweeter units and remeasured. See second pic.
Improvement on the graph. And the sound was vastly improved. So for now the problem is fixed. My friend will add some additional acoustic panels at first reflection points to try to control that 5Khz rolloff.
Thanks for all the suggestions.
Jeff
SMAC website: http://www.michiganaudioclub.com
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Follow Ups
- solution found - jeffmathers 06:16:39 04/24/12 (0)