All, I'm using a Yamaha RX-V870 Pro-logic receiver. This weekend I picked up the much discussed Sony WA-M40 powered sub. I managed to find an open box one at Best Buy for $109.60, compared to their sale price of $150, and the regular price of $199! So with that said, on to my question: The receiver has a subwoofer out, but all the manual says is that it's got a fixed crossover at 200 Hz. What it fails to mention is what channels are passed to this output. Does anyone know if this output sums all channels (L/C/R + surround), just the front three, or just the mains? Also, does anyone know if connecting a device to this output somehow engages a high-pass crossover on the remaining speakers? I doubt this is being done, just curious. At any rate, I haven't really had a chance to fully test this sub out yet, and I probably won't get a chance any time in the near future. I live in an apartment with old people below me that never leave... Thanks for any help! -Brett.