Room Treatment Options?

7271 Views 43 Replies 6 Participants Last post by bpape, Nov 9, 2008

fredk

Discussion Starter · Sep 15, 2008

I am in a situation where I have an irregular shaped room with some nasty bass peaks and nulls.

The Room:

The sub is located along the side wall (center of picture) and the surrounds are where the red Xs are.

Here is the bass frequency response graph:

I have a nasty peak at 52Hz and a nasty null at 76Hz.

From the reading I have done, traditional room treatements are good down to around 80Hz. If I understand correctly, my only option for that null is a tuned absorber like a Helmholtz/pannel resonator.

I am also extremely limited in placement options. I have the rear left corner from floor to ceiling, but can only put something in the front left corner in the top 1/3 of the room only. I do have the front and rear and some side ceiling/wall corners. I could also tuck something behind the main seating couch.

Where do I go from here?

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Wayne A. Pflughaupt

· #14 · Sep 21, 2008

Hi Fred,

Is the back corner near the left surround an option? You posted this graph on the REW Forum last week taken from that position, and it looks much less problematic as it has only a single peak from a room mode (which are easy to equalize) but no serious nulls (which can be a challenge).

You could use the BFD to tame that 38 Hz peak and have a decent curve. Of course, that won’t help any ringing issues you may have; the traps will do that.

Regards,
Wayne

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Wayne A. Pflughaupt

· #20 · Sep 22, 2008

Wayne. That position is possible. The thing I didn't like is that the peak is higher and shifted down to 38 Hz. There was also more ringing between 20 and 40Hz.

Could be that was a fluke. It's doubtful that moving a sub to another position will have an appreciable effect on ringing (other than perhaps a room mode measuring worse or better). It's best to take multiple readings at any prospective position if you're looking ar waterfalls. They can vary quite a bit from one to the next if you're using the Radio Shack meter.

Also, the peak being higher won't have any effect on whether or not it can be equalized.

The concern I have with equalization, is that it (probably) solves the problem for only one seat. If there is a way to considerably reduce the peak over a wider area, I would like to pursue that, even if it means considerably more effort and learning on my part.

You won't know if it helps for other seats or not until you measure from those locations. If you're seeing the same peak at different seating positions, then EQing it will be a benefit for all those locations. I have a peak at ~42 Hz that shows up in 4 out of my 5 seating positions, and EQ made an improvement for all of them.

Regards,
Wayne

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