I'm not sure, but I have 2 MC 7300's, and 1 MC 2205. I've compared them, and the 7300 has much better bass control and a bit more "authority". Both are sweet and tubey in the mids. They're hooked up to 6 Klipsch Cornwalls, and the 2205 powers the big award winning Klipsch center channel. The 2205 is about 27 years old, and the 7300 about 6 I think. Don't know if this helps. You may be looking for the technical and accurate answer. Have you tried Roger's Sundial site? This gent know all there is about Mac as a former engineer.
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