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Need solutions for flattening frequency response.... (1 Viewer)

Jeff_Wi

Stunt Coordinator
Joined
Sep 13, 2004
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I recently ran some frequency sweeps using Spectrum Lab and a Radio Shack spl meter.

http://pg.photos.yahoo.com/ph/cr8250/album?.dir=/8848

Can someone recommend what is the best approach to reducing the nasty bump centered at 80Hz? I have read about the BFD being good for this, but what about broadband eq, such as a 31-band eq? I have tried multiple xover settings and phase settings. The problem is actually coming from my mains, in conjuction with the room properties
 

MingL

Stunt Coordinator
Joined
Mar 26, 2003
Messages
214
The free way is to adjust the x-over on the sub to a lower value.

At 80Hz, it may be the case that both the subs and mains are active at the same time and they are reinforcing each other (thats probably why 80hz is approx 6dB higher)

Maybe try crossing over at 60hz or 70hz and things may just measure better.
 

Jeff_Wi

Stunt Coordinator
Joined
Sep 13, 2004
Messages
53
Well, actually the xover is set to the lowest of 40Hz. I measured the response of the sub only and the true slope is at about 70Hz -3db. By the way, can anyone see my graph? It was there at first, I think. Now it isn't.
 

MingL

Stunt Coordinator
Joined
Mar 26, 2003
Messages
214
Don't see it now.

Could you post the graph of the subs alone, mains alone and the sub+mains superimposed on the same graph? Its easier to see things this way sometimes.
 

Jeff_Wi

Stunt Coordinator
Joined
Sep 13, 2004
Messages
53
Ok, finally got the graph to work. As soon as I get a chance, I will do a comparison graph.
 

Mark Seaton

Supporting Actor
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Oct 10, 1999
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599
Real Name
Mark Seaton
First try setting the crossover for the mains up at ~80Hz. Then measure again.
 

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