might be more appropriate to this section : First, I must tell you that I've read a lot of past thred on this matter, but I still don't get it.... I got a Kenwwod VR-410 receiver, 5 speakers kit(small) from Kenwood and for sub I was previously using a passive low end 8" Kenwood sub but now made myself a nice Shiva Sonotub and I've been running it for 1 month.Both my sub have been powered by my old 100WX2 Pionner Stereo amp(so I am runnig it like a poweer sub via the pre-out LFE Now I got Avia Guide disk and a SPL analog meter from RadioShack I got no problem to calibrate the 5 channels, but I got to the sub, it is a whole different story : I've read on most post here that to properly calibrate your sub level, on Avia on the chapter 7 subwoofer set up(the test when it alternate between a High noise and a low noise) I should read on my SPL(set to C and slow) the same DB for both sound noise right? well there must be something wrong on my set up because if I crank it that much, it is way to much bass(very strong boomy distorted, ear bleeding bass!!) Now don't get me wrong, I love strong bass, but tight bass, and I found that with DB hit on my SPL 10 DB lower than the higer pink noise seem to be quite a good level. And I still have very good Wall shaking bass! now I know that you have to set your system the way each of us like it, but I am the kind of guys that love to follow rules when calibrating, and this one dosen't match. at first , I tought that it was becaue of my poor first 8" sub and that he wasen't able to deliver a high level, but now with my DIY Shiva, I still got the same king of setting needed(of course It sound way much better and deeper!) anyone else experiencing the same king of trouble(if I can say so)?