Quote Originally Posted by Opti-cal View Post
I've got a nasty dead spot (below 200hz -8db or more) right around my listening position.

.............

I don't really know if the dead spot is because waves are colliding there or because something else is stopping them getting there if that makes sense.

I will be treating the the main two corners behind the speakers with 100 x 30 x 30 bass traps and 50mm panels at various reflection points around the room as well as behind my listening position. Plus some strategically placed bookshelves and storage units of vinyl etc.

I'm hoping for a much improved sound but I'm just wondering if there is anything else I can do to address it?

Room is a weird shape kind of like a plus sign with the speakers in one section of the 'plus' and the listening position at the front of the opposite section.

I did have it sounding better but I moved some stuff around and now can't recreate whatever acoustic effect the 'stuff' was having.

Any advice or suggestions much appreciated.

Cheers,

Chris
Hi Chris,

I and a friend of mine have played around in out listening rooms with speaker positions, listening position, and dampening devices to try and get it as good as possible. Based on what you said about your room I would suspect it is reflections converging at your listing position and canceling each other out.

How are you measuring the 200hz dead spot? I use REW(free for Mac or PC) and us a simple USB microphone. After calibrating with the mic at my listening head position I do a sweep measurement form 20 to 20Khz and look at the curve. If the past I then made simple adjustments to speaker positions and so on looking for improvement. I also tried temporary bass traps by placing old blanket in the corners on poles/lampstands and hanging towels off the walls at strategic points. This would be worth trying IMO before splashing out on traps only to find they make little difference. Each time you make a change re-measure and see if its better.

I hope this helps a bit, but perhaps you have already done this. By the way I would turn the subs off to start with and get it right with the mains and then re-introduce the subs and see if they are the issue or not.