Originally Posted by h2oluver
The sub has both LFE and line inputs. By using the line inputs I should get a few more db's which is better right? Also by doing this I'm assuming that using the line inputs versus the LFE input, that will in effect put my subwoofers crossover into play versus the LFE which bypasses the subs crossover and uses the AVR's crossover for the subwoofer. Am I correct on that?
If you have both L & R low level input and LFE input on the sub, generally you'd just use a single cable from the sub output to the LFE input. LFE input on the sub generally bypasses most controls on the sub, so that there is no conflict with the settings you dial in on the processor/receiver.
And, yes, it is true in some cases you get increased relative
output from the sub using a "Y" to the left and right vs. either left or right alone (doesn't make it a more powerful sub, just means you have to compensate for a difference in gain). On one of my subs I measured about +4.5dB difference.However,
if using the LFE input this shouldn't be a factor because with just the mono input there is no need for the L & R summing circuit and the resulting gain difference when using just the L or just the R input. IOW, IMO, a single feed to the LFE input will produce the same level as a double feed to the L & R inputs.