Can four of the channels be bridged into two for more power?

No, This amplifier was not designed for bridging. Keep in mind, when you bridge an amplifier, you raise the noise floor, cut the amplifiers slew rate in half, and the amp looses control of the speaker cones. If you want High-Fidelity sound reproduction, you're not going to get it by bridging.

can mm7055 strong enough to drive KEF R205 speakers

You will have more power than you know what to do list trust me an absolute great amplifier

I have marantz av7500 surround receiver, can I connect it with power amp?

Yes you can. Just connect the mm7055 5 inputs to your marantz av7500 pre-outs and you will have your front, centre and rear channels connected. If you have an active subwoofer it should stay connected to the marantz av7500 subwoofer output.

ASIN	B003R7KMSI
Batteries	2 AAA batteries required.
Best Sellers Rank	#218,767 in Electronics ( See Top 100 in Electronics ) #1,324 in Audio Component Amplifiers
Brand	Marantz
Date First Available	September 1, 2010
Is Discontinued By Manufacturer	No
Item Weight	37 pounds
Item dimensions L x W x H	15.16 x 17.32 x 7.26 inches
Item model number	MM7055
Manufacturer	Marantz
Mounting Type	Surface Mount
Number of Channels	5
Output Power	140 Watts
Package Type Name	box" or "carton
Product Dimensions	15.16 x 17.32 x 7.26 inches
UPC	699927121457

Marantz MM7055 140 Watt 5 Channel Power Amplifier (Black)

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