Matt_Smi
August 21st, 2009, 7:38 PM
A while back I found this cool spreadsheet that someone put together where you basically punch in your SPL levels at each frequency and then it graphs it for you and compensates for the SPL meters in-accuracies. I did this with my VTF-3 MK3 and the results really surprised me, esp. since my system is more or less un-calibrated and I did this test using 160 kbps MP3 test tones! I plan to redo it with my Avia DVD however.
Basically all I did was set the volume on my Onkyo 805 AVR at -22 and the gain on the sub to half way or 12 O clock, played each tone twice and recorded what SPL I got. The sub was set to Max Output mode and yes I realize I am running it fairly hot (I usually have it on 11 O clock for movies) but regardless the sub never sounded stressed or made any port noise and even though this method isn’t the “proper” way of doing it or scientific at all doesn’t it still show that the sub is extremely flat, pretty much 100 Dbs across the board from 25-100 Hz with a few small +/- 1-3 Db peaks and dips. I think that is pretty damn good, I also want to try this in Max Extension mode. I have Ascend CBM-170 fronts and they as well as the sub are crossed at 80 Hz.
Basically all I did was set the volume on my Onkyo 805 AVR at -22 and the gain on the sub to half way or 12 O clock, played each tone twice and recorded what SPL I got. The sub was set to Max Output mode and yes I realize I am running it fairly hot (I usually have it on 11 O clock for movies) but regardless the sub never sounded stressed or made any port noise and even though this method isn’t the “proper” way of doing it or scientific at all doesn’t it still show that the sub is extremely flat, pretty much 100 Dbs across the board from 25-100 Hz with a few small +/- 1-3 Db peaks and dips. I think that is pretty damn good, I also want to try this in Max Extension mode. I have Ascend CBM-170 fronts and they as well as the sub are crossed at 80 Hz.