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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
podeschi
303 posts
 
And the stock tweeter jumpers are lousy. I replaced my jumpers with the Duelund Cast .6 resistor on the tweeter and an Empirical Designs custom jumper for the midrange.
hasse
230 posts
 
Yes, I´m using the Cardas tweeter and midrange jumpers on my 3.7´s.
podeschi
303 posts
 
I tried the Cardas jumpers (have a new set if anyone wants to buy them). It was like using resistors...Cardas smoothed/dampened the sound out a little too much for my likes. The Empirical Designs are the bomb.
honeymonster
4 posts
 
I think the impedance of the Maggies is too low to be safely handled by your power amp - the protection circuits see them as a fault (short) circuit load.
tmsorosk
1,013 posts
 
If you want to get loud, Maggies may not be the best choice.
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