%^@#!! 130 Hz peaks and nulls from hell

  • Thread starter Thread starter arcadeko
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arcadeko

arcadeko

Illuminatius Overlordious
Ok,

I been building bass traps and broadband absorbers. Anyway - I got corner traps in all 4 corners, not fully floor to ceiling yet, but I have made some great improvements in the overall sound and leveling the graphs using REW.

I just finished up 3 more traps yesterday and decided to do some more testing, I was in for a nasty surprise.

I noticed a perceived peak in the 125 range so I set my tone generator to cycle around 100 - 160, at around 130 I get this major perceived boost, so I grab a mic and stick it where my head would be while mixing. I start recording the sweep and sure nuff - there is a 10 db peak, then I decide to do some experimenting.

I put on a constant 130 hz tone and decide to start moving traps around to see if i can reduce it, and I notice that there are just freaking peaks and nulls all around the room! I know this is the COMB and LBIR effects.

I used the LBIR calculator from real traps and I am about 4' (48") from the speakers. There should not be a peak at this frequency AFAICT. Anyway - I tried moving the monitors around, using just one monitor, moving the traps around, etc. And I can't get rid of this freaking spike.

One problem I have is that my monitors are right up against a wall, but even moving them 2 feet from the wall didn't help so it seems that it must be a reflection.

IDK what to do about it...

any suggestions? It's not a real big room as you can see so moving the desk is probably not an option.

This is essentially the way the studio and traps are set up

studio4.png
 
Damn....
I'd have thought you'd have been there. :confused:

You think takin those other two corner traps to the ceiling would do it?
 
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