Well using the C350 as a pre and the C270 as an amp isn't exactly separates. If you paired a C160 with the C270 you might be right, but I would think a C370 would be pretty much equal to a C350 and a C270, considering the price differential.
Do you want to use the C350 as a pre? Or do you want to add the C270 to the C350 to biamp? I added a C270 to my C350 to biamp my speaks and it works well. I can't say that adding the C270 made a huge difference in my system maybe stronger bass. At some point I plan to buy larger speakers that will benefit more from the C350 and C270 combo. I live in a small apartment and I'm not to able to listen to my stereo very loud. I'm using small two-way floorstanders and the two amps combined is probably overkill. I really never had any intention of adding the C270 to my C350. The C350 is a great amp by itself. but I found a real good deal on the C270 so I went ahead and bought it thinking I might make better use of the two amps down the road. Both amps are great products and I don't regret buying either of them. Because of my living situation and my speakers I'm not sure I've realized the full potential of the C350/C270 combo.
I wouldn't do it and would suspect all you would hear is a tad more bass. I added power to my NAD receiver and realized it was a waste. Hardly any difference at all.
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