RE: you are right -- and AFAIK all the S-7200 does is...

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In Reply to: RE: you are right -- and AFAIK all the S-7200 does is... posted by avgfan on June 12, 2014 at 19:16:24:

It depends on the amp. The results can vary from not a problem to imploding at any level as the amp is totally unstable.

I do not know about the 7200 but their series of receivers that initially did not have a version with a suffix of "A" and later did were unstable into 4 ohms after the the new FTC rating system was mandated. My son uses a S7650CP with a set of 4 ohm speakers for hours at a time and there are no indications of any problems but, he does not run it hard. My earlier S9500c and SEL200 amp and receiver likewise seem okay with the load but, again, I do not run them hard.

An easy way to tell is to run the unit with an 8 ohms load at your usual listening levels and monitor the heat generated by the power transformer and output transistors. The do the same with a 4 ohm load. If the unit runs appreciably hotter with the 4 ohm load then they do not play nicely together. You can sometimes minimize the issue by reducing the volume and seeing if there heat level reduces.

Another test if you do not the test equipment is to get a pair of the original Advent Loudspeaker, the version with the masonite ringed woofer and a pair of The Smaller Advents Loudspeaker. The closer they come to sounding the same the better the amp is as to handling 4 ohm loads. They were designed to sound the same but with most amps do not as most amps are not as stable with 4 ohm loads. Even with the autoformer McIntosh, they do not sound the same. I did hit nirvana with a Rat Shack STA2250, though. The amp section on this receiver is excellent while the tuner sounds terrible. It is easy to mod to use as a power amp and are usually very inexpensive.

Don Brian Levy, J.D.
Toronto ON Canada

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Follow Ups Full Thread

Topic - Looking for a Copy of the Sherwood S-7200 Operation/installation Manual - avgfan 18:45:48 06/10/14 (6)

you're not alone - mhardy6647 15:17:35 06/11/14 (5)

RE: you're not alone - avgfan 13:02:13 06/12/14 (4)

you are right -- and AFAIK all the S-7200 does is... - mhardy6647 17:19:52 06/12/14 (3)

RE: you are right -- and AFAIK all the S-7200 does is... - avgfan 19:16:24 06/12/14 (2)

RE: you are right -- and AFAIK all the S-7200 does is... - Brian Levy 00:56:37 06/14/14 (1)

RE: you are right -- and AFAIK all the S-7200 does is... - avgfan 16:42:17 06/16/14 (0)

Follow Ups

RE: you are right -- and AFAIK all the S-7200 does is... - Brian Levy 00:56:37 06/14/14 (1)

RE: you are right -- and AFAIK all the S-7200 does is... - avgfan 16:42:17 06/16/14 (0)

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