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Originally Posted by Robert_J
Please explain why? There are dozens of recommendations in the Speakers and Subs section about turning up the crossover to the maximum value or better yet, using a bypass if the sub happens to have it.
-Robert
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40Hz would be the absolute worst place to set the crossover on the sub. If you are using bass management on the receiver, it is probably not lower than 80Hz and with the sub set to 40Hz, you just lost most of your bass between 40-80Hz. If you are not using the bass management on the receiver, there are very few mains and center speakers able to produce usable output at 40Hz, so again, you just lost significant output above 40Hz.
The correct answer is to use bass management on the receiver and turn the sub crossover all the way up (or turn it off). This means only one crossover will be applied in the range of the sub. Introducing two crossovers (receiver and sub) into the mix will cause nulls due to the crossover slopes being too steep when they overlap across the same frequencies. If the cutoff is too steep, you lose output in the steep areas.
) That system however has a Infinity BU-2 sub. The receiver has only one output for sub, but the sub has a high level input and low 2 level inputs (R,L). My old setup had both wired up. My question is what is the appropriate way to wire this up? Do I only use high level? IDK. And by the way, I just bought a new LCD and HD Directv. With all that money spent I don't have enough to replace sub. If it works it works. 
