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Tweaks for systems, rooms and Do It Yourself (DIY) help. FAQ.

Re: room acoustics

209.215.72.209

Rob,

The use of the wall panel sound absorbers is mostly for improving imaging and soundstage, allowing you to hear the recorded reverb and ambience on the recording better, without the room's overall sound being totally superimposed over the recorded sounds. This can sometimes make the overall FR flatter, but the use of these panels is not designed to help room modes or FR problems directly.

The use of the bass traps IS designed to help room modes, and they are highly effective from around 250 Hz on down in taming room modes, and allowing the bass to develop more naturally and without room boom.

In your case, since you have a small room, you would not want to make the bass traps too overly large, but yet, you would want to make them as big as you could to help the bass as much as possible. The very LF require a larger trap to help smooth them. A good minimum is an 11" diameter bass trap, this is the size of the smaller retail Tube Trap from ASC. Larger traps, such as a 14" diameter, will be more effective in calming the deep bass room modes.

As for the 315 Hz "dip", it is not enough to worry about relative to the other variations in your room, and reducing the bass modes WILL make the midrange seem cleaner and smoother than it is now, even if the reading s don't change. As I have posted in the past, the RS SPL meter and most test tones are using an averaging mode, they have to, to get a steady reading. This does not show the true picture with musical transients, or how the room reacts to those. This is where the treatments, both the wall panels and the bass traps, can help with transient information being much cleaner and clearer.

I would say, build the two side wall panels, and see how that helps (they can't hurt), and then go for at least a set of four bass traps, either one in each corner, or a pair stacked in the front corners for LF control.

Jon RIsch


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