Home theater crossover question


I mounted my surround side speakers on the wall, so I used my Onkyo TX-SR803 receiver's auto configuration feature. I went into speaker setup when it was done and looked at the crossover settings, and now I have a question.

It set the front speakers to 200hz and the subwoofer to 120hz. Assuming the front speakers send everything under 200hz to the sub and the sub only goes up to 120hz, does everything from 121hz to 199hz get lost? Shouldn't the speaker crossover point be the same as the sub? Thanks.
scuby

Showing 2 responses by javachip

Kal says "all's well" and Kal knows what he is talking about, but I disagree with him anyway. If your subwoofer puts out anything much higher than 80 Hz, then it will be localizable. In other words, you will be able to hear it thumping away in the corner of your room, or against the wall, or wherever. Sound loses its omnidirectionality above 80 Hz. So you should manually override the crossover settings and set both the subwoofer and the front mains to 80 Hz, for upper and lower crossover points respectively. If your front mains are so small that they can't get down to 80 Hz with ease, then you must have two identical subwoofers, placed beside or under each front main speaker, and then you can make the crossover as high as you like.
I looked at the specs for the Infinity TSS-1100 satellite/subwoofer system, and now I do agree with Kal. Leave the crossover for the front left and right speakers at 200 Hz, if that is what the receiver selected in the auto-configuration. The twin 3.5" woofers in each of the satellites are in danger of getting blown by excess bass energy, regardless of their rated power handling. Also leave the subwoofer crossover where the receiver selected, since as Kal points out, that only pertains to the bass re-directed from the satellites, not to the LFE channel. You will not be missing any part of the audio range.

To recap, the subwoofer will not be damaged by too high a crossover, although the sound quality may suffer. The satellites WILL be damaged by too low a crossover. Just place the subwoofer as close to the front satellites as possible (ideally right between them) and the subwoofer should sonically blend in with the satellites fairly well, especially since you indicate that you do your 2 channel music listening on a different system.