Interpreting REW Chart

1) It's most likely the room playing a roll in the measurements showing some room gain down low, if they were taken at the listening position. To get a better reading of what the sub is doing you can place the sub away from any boundaries and then do a near field measurement.

2) Someone with more experience in room treatments will need to chime in on what effect they could have but overall the raw graph doesn't look that bad. If that's your best spot for placement using the BFD to bring the 20-30hz range down a little and then playing with crossover, phase and possibly a cut in the 60-70hz range should get you a pretty level response with a natural house curve going.

Presuming that you have REW set up correctly, the better chart would be the one that appears flattest.

Where is your XO set? You may want to play around with the phase setting on the sub (or the distance setting on your AVR). That's a pretty nasty dip from 35-60hz, hopefully some of that is phase cancellation with the mains and tweaking the phase will help out... A BFD (or some other EQ) would definitely help.

If you want to get an idea on what the sub itself is doing without interaction from the room then place mic at the speaker or within an inch in distance from the surround and position the mic so it's centered. You could also do 1 meter but that's going to start getting more room interaction involved again.


A house curve is a roll off from bottom to the top in the FR. Many prefer it due to our perception, as the FR goes down our perception of the level decreases. In your graph for example start with a straight line at your response at 20hz and draw it straight through your 35-55hz response until you reach the crossover point. That's a very simplistic description and there are a zillion variations and degrees of it but that gives you the idea.

Phase changes the subs firing to get the smoothest response with the speakers at and around the crossover point. Unless you're doing sub with speaker measurements don't worry about it.


I think it will help a great deal with your peaks I know it did mine. BTW what receiver do you have. If you have one or are thinking about getting one, MultEQ should go a long way in leveling out that response along with other features and filters the BFD can't do of course Audysseey isn't as customizable either so its one or the other in that regard.

If you do have a receiver with MultEQ or are thinking about getting one I'd go that route first and then see where you stand. You might and probably will find you don't need external EQ.

Both, of course. Although what the sub, itself, may be doing on its own may be of interest, it is not so easy to measure this accurately, in-room. And, ultimately, that's not what is important, anyway. What is important is the measurement of the sub and room, together, as measured at your listening position(s). That's why you are running REW, right?


The phase setting will affect the interaction of the speakers and sub in the area of output over which they overlap. If you are measuring the sub, alone, as Jakeman02 pointed out, the phase setting should have no effect at all.



So, are you just running REW out of curiosity? Just to optimize your sub's placement? Phasing? That's fine, and can't hurt, but Audyssey will go a long way toward doing that for you, too. If you are going to fiddle with things like the phasing, do that prior to running Audyssey and, then, don't change it.

Was that graph generated prior to or after running Audyssey?

That huge hump between about 18 and 35 hz is probably a result of the bass boost from the Dynamic EQ. Switch off the Dynamic EQ and rerun the sweeps to see the response without that boost.