2. amps-preamps
  3. 1358359891

D'Agostino Momentum amp melts down

The latest issue of Stereophile tests the Momentum amplifier and amp number 1 melts down during the precondition test. Atkinson is afraid to subject amp number 2 to the same test and only runs it for 1/2 as long as the standard test.

Parasound, Bryston, and others pass this test but the Momentum can't? Then they act like it's no big deal like it melted down. So, if that's the case, why perform the test?

The manufacturer response doesn't remark on the melt down. I would think Dan would be duly embarrassed but what the heck, those copper heat sinks sure look great.

Would a prospective buyer (not me) be hesitant to power an inefficient speaker to loud levels with this amp?

rhljazz

Showing 1 response by bretdago

bretdago
4 posts
 
I am sorry that you interpret this as a meltdown. The momentum amplifiers normal operating temperature is 42 -44 degrees c(107-111f) the temperature rise to 48c (118f) is inconsequential. The amplifier in question failed from a non-related component failure in the power on circuit. The Momentum amplifier is designed to shut down at 70 c (158f) The unit under test was not close to that temperature. Many amplifiers operate temperatures at 70c(158f) and above. If John had continued his test the second amplifier would have passed without any problems. The Momentum amplifier has more than enough thermal head room for any load or any speaker. I was unable to give a comment
Until the unit was returned to me from testing.
Thank you for your concern.

Dan DÂ’Agostino
More to discover