Originally Posted by KPFury
yea i figured using the sub's variable xover would cause more issues than solve, but i wanted to try it anyway.
Basically i want to try the L/R + sub for 2.1 music by having the mains set to Large and Subwoofer enabled (in the receiver), and filter ON with variable xover set to around 50-60hz on the S12. Will setting the mains to Large disable the crossover onthe Panny? I don't see any setting to turn it "off"
For 2.1, if you set the mains to large, the only time the sub would play would be if you set the sub to get the same bass signal as the mains, thus doubling up the bass reproduced.
I'm not sure how your Panny works, but some receivers send all bass under frequency X, and other receivers still use that xo frequency for bass to the sub (when mains are Large and sub is LFE+Mains).
Lowering the crossover on your sub itself might be okay for music
, if your mains are playing full range, and you just want to boost the lowest octaves. But if you are going to do that, you can still crossover the mains at 60Hz/Small. This can take some load off the amp and speakers, and may make the sound a little clearer (especially at high volumes).
However, like I said, the frequency numbers on crossover dials on subs aren't 100% accurate. You can certainly tune it to taste.
With some experimenting, you should be able to blend the sub with the mains (set to small) and get very natural and detailed bass. If the bass extension on the mains is pretty good, and you have Large & LFE+Mains, then you have a lot of overlap of frequencies, and the potential for cancellation (= less bass). To check more scientficially, run frequency sweeps on Avia using a meter to see what the response looks like and find the best combination. You might find a lot of cancellation, and may be able to fix it with the phase setting on the sub, too.
But if you are going to use the setup for 5.1 movies as well, and don't want to fiddle with the sub every time you go between music and movies, either turn off the crossover on the sub if there's a switch, or if there's not a switch, just turn the crossover knob all the way up. If you don't do this, and you leave the xo on the sub at say 50Hz, you are filtering out the 50Hz - 120Hz range of the LFE signal as well.