Thanks very much Wayne.
So how does my room look?
I take it that the top image is showing I have problems around 100 and 130...?
Welcome to the Forum, Martin! It looks like you got a handle on REW. :T All you need to do now is re-scale your graphs. The top one needs a vertical axis of 45-105 dB, and the waterfall needs to be LOG instead of LIN (FREQ AXIS icon).
Decide which one you want to test, turn off the other one.I think that's both of my monitors..
How do I test them one at a time?
You’re aiming to get response roughly linear along the Target line. Right now your worst problem is that response sags badly above 2.5 kHz, not to mention a huge “hole” between 4-8 kHz.ps - could you link me to images of a really good room so I can see what I'm aiming for?
Well, you could open the Windows mixer and slide the balance control to the left or right.Obviously I imagined a more complex, software-based solution...
You're somewhat limited in the movement of studio near-field monitors or the mixing chair, so you would need to treat the area.what are the likely causes of these problems
Cancellation. There are formulas for calculating this, but it has to do with the distance between the bass driver, the room boundaries, and the frequency in question. The distance between the drivers themselves (in the case of stereo speakers) can also come into play.What is the likely cause of the nulls at the bass end? 85 - 105 is pretty disasterous.
The area between 1.5 and 2.5 kHz could be attenuated, but aside from that everything in the 330-2.5 kHz range is acceptable.As is 330 and everything above 2.5k!
Treatments that absorb would be your best bet. Wall-to-wall carpet on the floor would be good start, in case you don’t have any.Although, that said, I can clearly hear the flutter echoes.. Any ideas?
Treatments aren’t going to help the problems you have at the top end. Equalization is probably your best bet. That said, I have a hard time believing your studio monitors, assuming they are decent quality, are doing so poorly up there. I’d be more inclined to question the accuracy of the measurement. If you haven’t been, measure one at a time.So how best to treat the top end? I'm guessing diffusion as there seems to be too little of it...?