You said you are feeding the 800 off the DSP. I assume that means you are feeding the 800 off either the left or right channel as there are twin DSP boxes - one for each LFR.

I have twin 500s. I feed each off the left and right DSP boxes. I feed the 800 off the Onk's .1 channel.

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