Join Date: Oct 2006
Location: Northern Virginia
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I don't have your speakers but based on specs I have heard, I think you could use these crossover settings in your Onkyo TX-SR805 as a starting point:
LPF of LFE: 120Hz
Double Bass: Off
I actually do have an MFW-15. You should be running a subwoofer cable into its R line input or the LFE jack. Try the LFE jack as it's supposed to bypass the crossover in the sub. If you run into the line input on the back of the subwoofer then turn the crossover dial to its highest setting. Start with the gain at about 9 o'clock in a smaller room then bump it up if needed. For example, if Audyssey boosts the sub level to +10, then the gain on the subwoofer amplifier is too low.
When I set up my speakers I used an SPL meter, my laptop, and Room EQ Wizard software. If you have the inclination and patience, it may be worth looking into it.
Upstairs: Epson 8500UB | Onkyo TX-SR805 | DVDO Edge | DefTech PowerMonitor 700 | ProCenter 2000 | BP2X | AV123 MFW-15 | Onkyo DV-HD805 | Sony PS3 | Pro-Ject 1Xpression III
Downstairs: Panasonic TC-P60VT60 | Onkyo TX-NR818 | Pioneer SP-FS52 | SP-C22 | SP-B22 | MartinLogan Dynamo | Sony BDP-S5100 | Xbox 360 S