Originally Posted by Raylon
Soooo, I went through this same thing when I moved from an ancient 10" JBL to a PSA 1500. So I moved from a 10" 300W sub to a 15" 800(ish?)W sub. And like the OP is saying, I was severely underwhelmed by what I would call the 'rap' range. From 40hz and up, the JBL actually did kill the PSA when it came out output. Was it probably distorted as hell and sounded like crap? Yea maybe, but it was louder. The PSA kicked ass down low, down to some areas the JBL never ventured. But that little JBL, with it's higher tune and my carelessness with the gain knob, allowed it to be louder than the PSAi in a certain range.
So OP, I feel your pain. I needed that 40-80hz boominess back so now I have 4 18" subs. I don't think this is a placement issue at all like everyone else. You are just used to hearing a higher tuned little sub be really loud in one area, and the SVS probably can't reach that area as well. It does other things much better, but it can't do everything.
I get what you are saying, but There is no way that a 10" JBL even comes close to a PSA 1500 anywhere. I had the 12" JBL in my room and it wasn't it even close. Actually I have had several brick and mortar subs in my room to compare...Paradigm PDR10, JBL ES250, Polk PSW505...again not close anywhere. All of these subs are 106-110db subs in the 40-80hz with the peak of their output centered around 50hz. The PSA 1500 is a 115-117db sub in that range.
It does take time for your ears to adjust to a sub with a cleaner flatter response. Most of the Brick and Mortar subs are 50hz 1 note boomers.
The PB-4000 is not efficient in the upper end of the frequency range <50hz, but looking at it's output numbers his previous shouldn't be close anywhere.
I do agree that it might not be a placement issue, it could be a calibration issue...I had to do some manipulating with the setup to get the same level of Bass with the Marantz 6012 that has Audyssey XT32 compared to my Yamaha's that have YPAO. Audyssey is not really easy to setup for a Novice. If you do the standard calibration process that it prompts you to do, then you end up with a high dollar sub that has NO BASS.
Mike Thomas has a excellent setup guide that all owners of AVR's with XT32 should read.
The OP does not need a mic or change placement yet. There are some order of operations I would do to try and figure out the problem.
Let's start fresh and try these steps:
1) Pre calibration. Use the level match function in Audyssey. Adjust the level of the sub past the green. Set it for 80-82 db. Ignore the warning and proceed to calibrate.
2) After the calibration finishes. Go in the the manual setup and set all speakers small, 80-90hz cross overs.
3) Verify that Audy set the sub level around the -9 range. Then move it up to -3.
4) Do not use the sub level adjust, that just ends up clipping the signal.
5) If still low bass output, Then turn Audyssey off together, and move the sub trim in the AVR level to 0, and start increasing the Sub level in on the sub amp. If you start to get good bass output then you know Audyssey is trying to apply too much EQ to fix a potential room response issue. Now it's time to invest in a mic and start moving the sub around and measuring the room response to find a area that will require the least amount of EQ to flatten the response.
6) If still No bass output, Disconnect the sub from the AVR and hook it up directly to a smart phone with a 3mm to rca y adapter and play some music. If the sub has good bass output then you have a AVR or cable issue.
7) If still nothing...Call SVS. SVS has had some minor issues with amps. I had to have the amp replaced on my SB12 due the gain side failing and I couldn't get any output from it.