Originally Posted by crazy1mg /forum/post/0
For now, set the cross-over in the receiver to 80Hz, and identify all of your main speakers to the receiver as being "small".
If you have the subwoofer connected to the Subwoofer/LFE output of the receiver then either disable the cross-over control in the subwoofer itself, or turn it up to the highest possible frequency.
The receiver will use the cross-over setting to "roll off" the frequencies it sends to your so-called "small" main speakers, so that they are not trying to struggle to produce low bass, and will "roll on" the frequencies it sends to the subwoofer for the same reason. The bass that isn't going to your "small" speakers will be redirected or "steered" by the receiver to your subwoofer so you won't lose anything.
You disable the subwoofer's own cross-over to keep this filtering from being done TWICE for the signals sent to the subwoofer.
That's a starting point.
Next, get a Sound Pressure Level meter (the one everyone uses is sold by Radio Shack and is quite inexpensive), and a calibration DVD such as Avia or Digital Video Essentials (DVE). Using any test tones generated by the receiver, and/or the audio tests in the calibration DVD, first balance the volume levels for all of our speakers -- including the subwoofer. This is done using the receiver's controls, with possibly the aid of the volume knob on the subwoofer. This is the single most important thing that you have to do, and it is much easier to do it accurately with an SPL meter.
You will likely also be asked to specify the distance from each speaker to your listening position.
Having done that, then NOW you can worry about cross over settings. The calibration DVDs come with instructions that will help you get a handle on this.