Did you use YPAO to set up?
I did with my new Rocket 760s and it cut bass -12dB at 80Hz. I had the same impression as well as shock and horror...whattya mean people are running these things without a sub?
The next day I re-ran the program with the EQ skipped.
There it was!! Crisp, clean, powerful bass, no need for a sub at all, and I only have 4 6.5" so hopefully this is your problem as well.
And yes, I thought Direct bypassed all that stuff, but apparently it doesnt.
You can go to your manual setup and change from PEQ to GEQ and leave it all flat, that is what really got it going for me.