Originally Posted by rosstg
I currently have a 7.2.2 setup. I was debating adding another Atmos modules or another sub and have decided on the sub. I currently have dual PB-1000’s. I was thinking about adding a PC2000 but was told by a few SVS reps that it’s not a good idea, to stick with the same line. I’m planning on placing the 3rd behind my couch near my wall roughly 5 ft from MPL. My question is will 3 subs be ok or am I better with sticking with 2?
Originally Posted by rosstg
You convinced me to go with another PB-1000 since I have 2. Do you see any problems with using 3 1000’s or should I stick with just 2?
My room is 20ft deep, 13ft wide. My couch is 9ft from my screen with my dual 1000’s. I would place the 3rd roughly 9ft behind my couch against the side wall.
I can't speak for Ed, but I would not
add another PB1000 if I were you. Instead, if I wanted to upgrade my bass, I would trade-in or sell my dual PB1000's, and upgrade to dual PB/PC2000's. That would be a far more significant upgrade than adding another PB1000, and it would also be a much better long-term investment in your HT system.
Sometimes, people only answer the questions you ask them. If the question is, "Should I add a PC2000 to my existing dual PB1000's?" then I agree with the answer you got. It is not likely that the two different models would integrate well because they are so different in tuning point, frequency response, and output. But, it is precisely because
they are so different that I would recommend upgrading to the ported 2000's, rather than simply adding a third PB1000.
Adding a third sub can sometimes improve your overall frequency response, especially if you can distribute your subs on three different walls. But, the low-frequency extension will still be determined by the tuning point of that particular ported subwoofer model. And, the overall increase in max SPL from the addition of a third sub will only be 3db, averaged across the sub's bandwidth. (A doubling in subs yields an average of 6db of output, so going from 1 sub to 2 adds 6db, and going from 2 subs to 4 only adds another 6db.)
That is why it is so important to start with subwoofers which have the inherent output that you are looking for to begin with. And, it is why, with ported subs, you also want to start with the low-frequency extension that you are looking for--because that is determined by the port tune, cabinet volume, and DSP applied to that specific subwoofer.
A PC or PB2000 will have a frequency response which is several cycles (Hz) lower than the PB1000's you have now, and going from 2 PB1000's to 2 PB/PC2000's will increase your max undistorted output by a good deal more than 3db at every frequency. The 2000's are simply better subwoofers than the 1000's. In my opinion, that would be a much better option if you are looking for audible improvements in your HT system.