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Pass 250.5 shuts down driving Magnepan 3.7

This is my first post so please bear with me.

My Pass labs 250.5 protection circuit shuts the amp down when I drive my new Magnepan 3.7s at high volume. I'm talking about a volme higher than I might consistently listen, but not an unbearable level.

I'm using a Cary Slp 05 preamp with long balanced ICs (25 ft,) The amp is close to the speakers with less than 6 feet of speaker wire. The system works fine at normal volumes. I've tried the same thing with a pair of Cary MB500 (750 W @ 4 ohm) and they too shut down at high volume.

I believe the maggies drop below 4 ohms and I wonder if either amp can handle the impedance drop below 4 ohms.

Has anyone experienced this issue ?

Any suggestions ?
gcoxsom

Showing 2 responses by brownsfan

brownsfan
1,508 posts
 
I suspect there is a problem with the speakers. My Cary 500 MB's have never shut down driving my 3.7's. Do both channels of the Cary shut down?
brownsfan
1,508 posts
 
I'm not sure what the problem was with the OP's set up. Again, my Cary's are having no issues with my 3.7R's. They handle Mahler(front row loud)without complaint. There is not an inherent incompatibility between the Cary's and the Maggies. Something else was not right.

As for the OP's preference for the sound of the Pass 250.5, well, there is a reason Pass amps have such a great reputation. I wouldn't mind having a chance to A/B the Pass and Cary's myself.
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