Originally Posted by Cadd
Ok, next is the frequency sweep for me. Does the Avia disk do that? I should have gotten the package when I got the SVS sub!!!! Now, I'm going piecemeal and will end up paying a lot more.
How exactly does the frequency disk work? They play a tone....say 50hz. But how do you know it's 50Hz? The Radio Shack SPL that I have only tells me how loud it is (in dBs), but it doesn't tell me how high or low the sound is. Maybe it's time for me to so a search and do some reading.
You can still get it from SVS. I think it's $80 for the meter and the Avia disk.
Definitely run the sweep tones, which start at one frequency and go through all the frequencies to the last one (ie., start at 200Hz and go down to 20Hz). If the bass is really "bumpy", you need to experiment with placement as much as you can to get it as flat as you can (no more than 10dB difference between any 2 frequencies, less variation is even more desireable - flat is the most desireable).
There are also test discs you can get (or burn on your own using test tone mp3s) that have an individual sine wave for frequencies. You would know which frequency it is by the track number. Ie., the downloads section here has different sine waves, sweeps, and bass-heavy songs: http://www.realmofexcursion.com/
Yes, 34dB hot is WAY TOO HOT. I would assume that you have some big peaks in there throwing it off. Definitely check how flat/even the response is, and then re-calibrate after tweaking location.
If the sub is flat AND 30dB hot, then you are pushing your sub to reference level at -30 below (ie., -30 on the dial of reference level set to "0" on the dial). If the sub is relatively flat, and you set it so it reads the same SPL as the mains with test tones, then you are already about 2dB hot. If that's not enough bass for you, you need to watch at about -10 or -5, not turn up the bass. I have a feeling the response with your current placement sucks, and that's why you feel the need to run the sub so hot. If you listen to any music, it will definitely sound bad that way. Before I calibrated my sub, I had it at just under 1/2-way on the sub gain and a fe notches under the level of the speakers on the receiver. Movies sounded good, but music was very boomy and I couldn't turn it up very high at all. When I calibrated, I found out I was about 10-15dB hot. When I turned it down to match the speakers (-3 below other speaker levels on the receiver, 1/3 on the sub gain for me), music became much more natural, and I could watch movies (and music) at much higher volumes, and the bass in movies suddenly had a ton of detail rather than just being a series of boomy one-note booms.
See this thread to read about my experience experimenting with placement, and finally getting the sub's calibration in line:http://www.avsforum.com/avs-vb/showthread.php?t=640646