dkulmacz
Member
More
- Preamp, Processor or Receiver
- Onkyo TX-NR818
- Front Speakers
- Hsu
- Center Channel Speaker
- Hsu
- Subwoofers
- Hsu
I have a bedroom studio using a pair of Kali Audio IN-8 monitors and an SVS SB-1000 sealed subwoofer, powered by a MiniDSP HD unit. The room has a decent amount of DIY rockwool acoustic treatment; floor-to-ceiling 15" superchunk wedges in the front corners, 6" thick panels on the sidewalls at first reflection points, a few superchunk wedges here and there on floor/wall boundaries front and side, a 3" thick cloud mounted 3" below the ceiling. The room itself is 10' x 12' x 8'. I've done plenty of data gathering and adjustment using REW and the Mini DSP EQs.
The odd (perhaps) problem? The Kali monitors -- who can play pretty flat down to around 40 Hz per REW -- produce a severe dip at 109 Hz when playing. I assumed this was a room resonance, because 109 Hz is very close to 10' wavelength. However...... when I play the SVS subwoofer with no crossover, it produces a relatively flat response all the way up to 200 Hz. No sign at all of a dip at 109 Hz. The Kali monitors are set as close to the wall behind them as possible, they're toed in 30 degrees to point at the listening position, and the back corner is less than a centimeter away from the wall (at ear-height, with the center of the woofer cones 33" from the side walls). The SVS sub is also nearly flush against the back wall, on the floor, side-firing with the driver sitting at the room midpoint.
As a combined 3-way system, any setup with a "normal" crossover point (say, below 80 Hz) shows the 109 Hz dip in full force. But I've found that if I set the crossover point very high -- from 160 Hz up to 200 Hz -- then the 109 Hz dip disappears, since the subwoofer (which doesn't exhibit the dip) is providing the sound at those frequencies. Or at least, that's my interpretation.
Because the Kalis are so close to the back wall, I didn't think SBIR would be the problem. But since the frequency is very near the side-to-side dimension resonance, maybe it's that. Though I've tried moving the speakers sideways within practical limits, and it didn't seem to do a whole lot to eliminate the dip. Is it possible to have SBIR issues with the side walls? And if so, any ideas on how to address this?
Also, is setting the subwoofer crossover point high -- say, 180 Hz -- a viable strategy to fix this? I don't know if that is high enough to start messing with the stereo image and such. It seems to be a nice fix for an otherwise thorny problem.......
The odd (perhaps) problem? The Kali monitors -- who can play pretty flat down to around 40 Hz per REW -- produce a severe dip at 109 Hz when playing. I assumed this was a room resonance, because 109 Hz is very close to 10' wavelength. However...... when I play the SVS subwoofer with no crossover, it produces a relatively flat response all the way up to 200 Hz. No sign at all of a dip at 109 Hz. The Kali monitors are set as close to the wall behind them as possible, they're toed in 30 degrees to point at the listening position, and the back corner is less than a centimeter away from the wall (at ear-height, with the center of the woofer cones 33" from the side walls). The SVS sub is also nearly flush against the back wall, on the floor, side-firing with the driver sitting at the room midpoint.
As a combined 3-way system, any setup with a "normal" crossover point (say, below 80 Hz) shows the 109 Hz dip in full force. But I've found that if I set the crossover point very high -- from 160 Hz up to 200 Hz -- then the 109 Hz dip disappears, since the subwoofer (which doesn't exhibit the dip) is providing the sound at those frequencies. Or at least, that's my interpretation.
Because the Kalis are so close to the back wall, I didn't think SBIR would be the problem. But since the frequency is very near the side-to-side dimension resonance, maybe it's that. Though I've tried moving the speakers sideways within practical limits, and it didn't seem to do a whole lot to eliminate the dip. Is it possible to have SBIR issues with the side walls? And if so, any ideas on how to address this?
Also, is setting the subwoofer crossover point high -- say, 180 Hz -- a viable strategy to fix this? I don't know if that is high enough to start messing with the stereo image and such. It seems to be a nice fix for an otherwise thorny problem.......