nelmr
Active Member
Okay since the HSU VTF-15H is on it's way I'm trying to figure out what to do with my SVS 20-39PCi. I'm currently running the SVS -5dB relative to the other speakers, as it's limited in the large room I have.
So I was wondering if collocating the two subs, one at -5dB and one at 0dB would be advantageous? Assuming the same phase, and frequency, the gain by doing this should be just shy of 4 dB*.
So this would give me the option to run the LFE channel 3-3.5dB hotter for movies, or keep it the same SPL of the other channels with less distortion. However, the subs aren't identical. Would this pose a problem? I realize the boost would be less below 20hz as the SVS drops out at that point. But from 20-80Hz wouldn't this benefit still mostly be there? Even if the SVS were to be -10dB in comparison, I still get a 2.4dB gain by combining the two.
The other challenge is that I am sitting near the dead center of the room (if ignoring any adjoining areas). I realize this is not optimal for bass. But With the room I'm not sure of any other arrangements that work as this is also our living/dinning area. I'm not sure where the room nulls and modes are mathematically (as it's hard with the open areas). But I do know that 4-5 feet to the right of the listening location, there is about a 6dB gain in bass response using the S&V test tones for the sub.
Below is a diagram of the room layout. Since I drew the diagram, I have moved the SVS sub to the front right area of the room as the bass response is a couple dBs better there compared to the left. I've also moved the current listening spot and surround speakers about 1/2 a foot closer to the front of the room.

* Math works out to:
10^(0/20)=1
10^(-5/20)=0.562341
20Log(1+0.562341) = 3.875518dB
So I was wondering if collocating the two subs, one at -5dB and one at 0dB would be advantageous? Assuming the same phase, and frequency, the gain by doing this should be just shy of 4 dB*.
So this would give me the option to run the LFE channel 3-3.5dB hotter for movies, or keep it the same SPL of the other channels with less distortion. However, the subs aren't identical. Would this pose a problem? I realize the boost would be less below 20hz as the SVS drops out at that point. But from 20-80Hz wouldn't this benefit still mostly be there? Even if the SVS were to be -10dB in comparison, I still get a 2.4dB gain by combining the two.
The other challenge is that I am sitting near the dead center of the room (if ignoring any adjoining areas). I realize this is not optimal for bass. But With the room I'm not sure of any other arrangements that work as this is also our living/dinning area. I'm not sure where the room nulls and modes are mathematically (as it's hard with the open areas). But I do know that 4-5 feet to the right of the listening location, there is about a 6dB gain in bass response using the S&V test tones for the sub.
Below is a diagram of the room layout. Since I drew the diagram, I have moved the SVS sub to the front right area of the room as the bass response is a couple dBs better there compared to the left. I've also moved the current listening spot and surround speakers about 1/2 a foot closer to the front of the room.

* Math works out to:
10^(0/20)=1
10^(-5/20)=0.562341
20Log(1+0.562341) = 3.875518dB