I swear at one time I saw a photo of yours with a TV and a bed. Could have been a different room I suppose.

I found my 800 extremely easy to place. Just no contest compared to the 600v2. Set the polarity switch to zero at that position. As for the phase control, which your 500 lacks, you'll have to use a dB meter and run a test tone at the crossover frequency. If you're going to run room EQ, set the gain to flat on the back of the sub. I run it flat for movies and boost for music. Set the gain knob on the back to about a third for your room size.

House of the Rising Sone
Out in the mid or far field
Dedicated mid-woofers are over-rated