Originally Posted by commsysman
It is kind of silly to have front speakers that are capable of producing some good bass, and then waste that capability by using the subwoofer excessively.
My experience would lead me to set up the front speakers to operate full-range, with no limiting of their output, and set the subwoofer's high-frequency limit filter to somewhere between 50 and 70 Hz.
I would not use the OPPO to set any frequency ranges or limits.
Experiment and see what sounds best, using a music clip or CD with good plucked string bass in the lower range, or other 40-80 Hz tracks.
Only careful listening is going to tell you what works the best, but try to get as much as you can out of your front speakers.
A 6 1/2" midrange is not physically capable of producing good bass at reasonable listening levels for acoustic music (like jazz) to say nothing of home theater. I'd try a 120Hz cross-over, especially with a ported speaker which unloads below its port tune and produces excessive distortion.
Output at the maximum linear excursion into full space for various representative drivers at 3 feet is as follows at 120, 80, 40, and 20Hz. Many drivers have less excursion and lower output. Subtract 3-5dB for living room dimensions and more for a larger space for the SPL at your listening position
Size Driver Sd (cm^2) x xmax (mm) 120Hz 80Hz 40Hz 20Hz
4 1/2" Seas W12CY001 50 x 3 89dB 82dB 70dB 58dB
5 1/4" Peerless 830873 88 x 3.5 95dB 88dB 76dB 64dB
6 1/4" Seas L16RN-SL 104 x 6 101dB 94dB 82dB 70dB
7" Seas W18EX001 126 x 5 102dB 95dB 83dB 71dB
8.5" Seas W22EX001 220 x 5 106dB 99dB 87dB 75dB
10" Peerless 830452 352 x 12.5 118dB 111dB 99dB 87dB
Good jazz recordings at 85dBC SPL average can have 107dB peaks at the speaker. Reference level home theater can get you to 110dB.