Hi zathras,
Incidentally, a 6-ohm load is not a problem for your receiver, even though Pioneer cites "8 to 16" ohms as the recommended impedance range. Virtually all A/V receiver manufacturers do this, to keep users from pushing the units beyond the power-supply capabilities.
It's 4-ohm loads that cause trouble with many receivers. The VP-150 has a 6-ohm nominal impedance and won't present a "difficult" load to your Pioneer.
I'm currently using the VP100 with two M22ti's and I'm now quite satisfied with the timbral blend.
Regards,
