onkyo a-9050

Hi, and happy xmas to all, I interessed to this amplifier and want say if someone know how sound and if this valid alternative to the other brand like yamaha, pioneer etc.. in this price range.
I view the specs but I don't understand why the power is :
75 watt rms in 8 ohm and 65 watt in 4 ohm, but maybe because 4 ohm power is limited to avoid overloading the transistors or is there some other reason?
but it is an integrated working in class D or the classic A / B?

I would jump on this Marantz PM6004 that is on sale at music direct before the price goes up. Or go with the Yamaha S-500. But I think that the Marantz is the best of the lot.

MARANTZ PM6004 INTEGRATED AMP at Music Direct

Marantz PM6004 Review | Digital Trends Reviews

Marantz PM6004 review from the experts at whathifi.com

The Amp is an NAD C375 it doesn't have a sub out. So i was told to use speaker out to in on the sub from speaker 2. The problem with that is the sub doesn't have speaker conn. The pre out 2 may work but whats the deal will the volume control nob, please help

JohnMichael has the A-9555. Not sure how close it is to the A-9050 but maybe he's got some experience with that model too? He may be able to able to give you some first hand impressions.