I think a lot of us here see "6000 cu ft rooms" and instantly think "this person needs a vent to get flat response unless he's willing to pay thousands of dollars..
I'm guilty of it. I won't deny it at all. Yet I'm a hypocrite
I'm running a sealed subwoofer with no bottom end equalization. QTC = .58 (not factoring in stuffing though, so it may be a bit lower)
Anechoic Simulated F3 = 33hz
Anechoic Simulated F10 = 17.5hz
Now my basement is pretty big. It's your typical 25 x 17 x 8 (or 10?) family room type area open to the kitchen and some other rooms and a hallway. Pressurizing it on paper is something I don't think I would ever attempt to do.
I ran some sweeps today. Since I was too lazy to set the subwoofer up on its own, it is being run with the receiver high pass filter in place. I did set the High pass filter as high as possible, though (180hz), so most of this response is from the subwoofer alone. Main speakers set to small.
Measurement microphone is a Parts express calibration of the Dayton EMM-6.. at the very least it should be reasonably accurate down to 20hz. Anything lower than that is effectively a crapshoot as the calibration file does not include information below 20hz.
I also managed to audibly clip my marantz for the first time ever... a part of me was happy <_< and the other part was not so much
1/24th octave smoothing was used.
Sweep 1 (yellow) is somewhat nearfield to the subwoofer. Maybe 8inches. It hopefully takes away as much of the "room" response as possible. The sub is placed near a wall so i doubt it`s perfect though. I can't really explain the bump between 30 and 40hz to be honest, though. On paper though, this sub is around 3db down near that point with a shallow (12db/octave) rolloff.
Sweep 2 (purple) is the so-called sweet spot but in this current positioning it's anything but a sweet spot. This is exactly why measurements are important for this sort of thing... Take a look at the room lift. Even though my FR is ANYTHING but flat in-room(kind of explains why I`ve felt my sub seemed to lack midbass... I realize the importance of placement but I`m kind of lazy and don`t wanna depend on my ears), it`s
Sweep 3 (fushia) is a spot I like to sit at; same couch, but about a seat and a half over. Again, it`s anything but a sweet spot
but the room lift is still pretty identical.
Sweep 4 is the extreme off axis seat. ~45 degrees from the center channel, and just adjacent to the subwoofer. it's a bit closer compared to the other two seats, so i was expecting some different results (also based on what I've heard). The room lift dissapears at this seat though, which is odd, but does seem to explain the reduced "rumble" i've heard at that seat..
Moral of the story... yeah, I should mess around with placement for this sub. Measurements can be eye-opening. I might play around with placement now, but it's like... 350lbs dude... so not fair! ;-;
