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Hello, I have inherited a McIntosh MC-7270 amp, and plan on wiring it to my two Bose 201s to test before selling. I need to know how to properly wire the speakers to the amp. The rear of the amp looks like this: [url]http://www.eonet.ne.jp/~audio/MC-7270-51.jpg[/url] and the Bose are 8 ohm. In case you can't see, the outputs panels on the left are right channels of the amp read COM, 1, 2, 4, and 8 ohm. I just need to know where to put the positive and negative wires of each speaker. I am used to receivers that have separate positive and negative outputs for each channel, but this amp doesn't seem to have that. Do I have to use the 'COM' (common?) terminal? Thanks for helping out a newbie.

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Well what you are dealing with is a HI-FI tube amplifier. The reason it has COM, 1, 2, 4 and 8 are because it does not have a transistor driven output. It has a transformer coupled output. The 1,2,4,and 8 are the different taps of the transformer in order to impedance match your load (speaker) with the tube power section. This amp is 270 per channel and your speakers are only suggested to 120Watts. You would use the Negative to the common terminal and the plus to your 8 ohm terminal on the Amp. This is a great amp, you should keep this and not sell it.

Posted on Jun 12, 2011

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Posted on Jan 02, 2017

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