Originally Posted by Jens Eklund
is quite complex but in general; by placing the source close to the boundary (assuming somewhat rigid) you will push the cancelation frequency up in the frequency range (since you decrease the flight time difference between the direct sound and the reflection from the surface behind the speaker. There are many positive effects by doing this:
Most speakers become less omnidirectional as the frequency increases so the reflection from the front wall might not be as severe as if it was a low frequency (since most speakers are omnidirectional below about 300-500 Hz).
A “high” frequency reflection is easier to absorb than a low one.
If the entire area below a certain frequency is raised due to constructive interference, you can use the controls on the monitor to compensate for this as it was designed for this purpose. If one the other hand you have peaks and dips due to SBIR if the speaker is not close to the boundary, you cannot use these tools to compensate.
But again; SBIR is complex and as soon as the boundaries are not very ridged, solid and heavy, you really cannot guess what position is going to be the best one (unless you can flush mount the monitors).
Awesome you answered my next question about the adjustments on the back of the speaker:
To recap: if there's peaks and dips after testing, speaker position and treatment will be a better bet to correct it (SBIR is a possibility ) if the whole low frequency is affected as a whole it's due to it being close to the wall then I can use the room adjustment on the speaker.
Which brings me to the next question:
Theoretically that room control on the back of a speaker (in which has a roll off around 500hz) is the only effective eq adjustment on the speaker in terms of acoustical accuracy? The other controls should be left neutral because then its similar to using eq which won't fix acoustic issues, correct? Seems like they're there mainly if someone wants to use a sub and roll off the low end or if someone doesn't want accuracy and more so them to sound good (like in a home theater setting).
My last and final question (you have cleared a lot up for me and I thank you a lot!) Besides avoiding SBIR what's the difference between having a monitor (front ported if any ports, I'm assuming rear would be a mess?) in the wall compared to flush up against it?
How come studio owners say putting a front or non ported speaker in a wall CAN be a good way to avoid issues, but home theater people claim that if a speakers not designed for being in the wall it will sound like crap? Can only mid fields and bigs be placed in the wall? Would it be unheard of to place a near-field in a wall?