SVS PB 12 + help please

Kelley_Moore

Ron Temple wrote:

I'm kind of in danger's camp on this one. If it's not the driver or amp, you've got some major suck out's in play. The Plus 2 will take care of that and if you keep both, you're going to have bass you can taste.

I think he is going to have bass he can taste just from getting the PB12plus/2, but having the other one may not give him any additional benefit especially under the symptoms he is describing. I asked Tom about purchasing an Ultra/2 to replace my Plus/2 and how much of a difference would it be. Tom told me the following…

“The PB12Ultra/2 is slightly more powerful than the PB12plus/2…but performance gains wouldn’t be very cost effective in my opinion. For the most part, it would be 1.5dB…maybe 2dB tops. Adding a second PB12plus/2 would give you a 6dB gain. And I project the new PBUltra/2 (available in 2007) to be equal to dual PB12plus/2 subs too. “ WOW!!

“Something like a 20-39PC+ cylinder will add 2-3dB across the board (assuming you place it near the Plus/2). But again, unless you are approaching the output limits on the Plus/2 on a regular basis…adding 2-3dB of headroom probably isn’t going to make a huge difference to you.”

If you have to throttle back or “calibrate the sub just under the point where that bottom occurs, there is no bass in that entire scene” the new PB12plus/2 may drown anything the old sub is pushing out. Did the boys at SVS say if they thought something was wrong or did they attribute it to room size?

Either way, I think you are going to be extremely pleased with your new purchase. If it were me, and this only my opinion which means nothing, I would consider spending $200.00 in shipping to put the old sub on the 15 day DL and send it back and have them look at it.

Good luck and keep us updated,

kelley

Schwingding

Below is the note I sent to SVS after being THRILLED by the PB12/2 that arrived yesterday. I'm still laughing because I thought the PB12+ was big, this thing is a monster.

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Hi guys,

The PB12/2 arrived yesterday. Firstly, it is finished absoutely stunningly. Any expensive furniture maker would be proud of that finish.

HOLY CRAP DOES THAT THING PUT OUT SOME BASS.

I turned off the existing PB12+ while installing the new /2. As directed, I calibrated it inline with the SPLs from my other speakers, while starting with the gain on the sub between 1/3 and 1/2 way. I used the 20Hz tune for initial setup.

Started out by immediately playing the scenes that was stressing out the PB12+ and grinned from ear to ear - no problems at all. BUT THE BASS! The room is more full of sound, and I have a harder time hearing where the sound originates - a good thing.

So then I turned the other sub back on and recalibrated with both on - this required dropping the input signal by almost 8db on the receiver. Then I started playback again, SWEET! But that smaller sub still has the same trouble during those lowest of low scenes. This makes me think there might actually be something wrong with that sub.

I then moved to other material - music, etc... and had a superb time playing with my new toys. No troubles at all with the older sub until I play those few movie scenes previously identified, so I stuck to music and was in blissful low frequency heaven. I found a bunch of new room problems, now the drywall itself is making noise. Seeing as how there was so much effortless bass being produced, I figured I'd move the subs both to the 16Hz tune, and that was achieved with apparently zero loss of higher end in my room and at my sound levels.

I'm going to send that PB12+ back to have it checked out, but I'm wondering if you'll take it as an exchange on a 2nd PB12/2? (really)

Thanks again for your great support. This PB12/2 is frankly, unbelievable. The two together achieved some SPLs that I found a little disturbing when I was really working them out. I could swear that I heard them laugh at me when I wondered if they could go louder.

Mike

Ricardo

Congrats......isn't it great when everything works out better than expected???

On that second PB12/2.....you're really insane

Ron Temple

Congrats Mike,

I agree there's something wrong with the Plus. Send it back. You might check with G-force regarding 2 Plus/2s. He initially got 2 of them in a room about your size, but ended up selling one due to cancellation I believe. IIRC, one sounded better. I wish I had the space...maybe next year.