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
FWIW, I think this thread is appropriate, but also think some of the words chosen are hyperbolic.
Really? "MOST amps fail the test?" Hmmm... also I disagree with the statement "This is pure entertainment with absolutely no value"...since when does "pure entertainment" lack value? Do happiness, mirth, delight, joy, glee, intense snarky and self righteous AH HA moments, or fun at the expense of the uber-sensitive lack value? I say NO NO NO...I love this aspect of the hobby: "when realities collide." The audio reviewmanati have their collective heads so far up the wazoos of some makers of VERY EXPENSIVE TOYS they get faint from lack of air (and sad from their inability to personally afford $175,000 speakers, $55,000 amps, or $15,000 phono cartridges). Of COURSE a 50K amp pair should be flawless...otherwise why pay 50k for this stuff? And why not delight when a spanner hits the works. It's fun! Still...I think Momentum stuff is great, looks amazing and sounds fabulous...when it works!
I think, but only Wolf will know this for sure. That people that pay 55,000 for an amp or an ape or a meal or what ever, they want attention. So in that respect Dan A' is a genius. His product breaks and the owner gets some more attention. So does Dan A' like in this thread. Brilliant I say Brilliant!! I wish I would of thought of that. I guess that is what it takes to be an audio designer you gotta think outside the amp.
I'm an old fud and the last thing I want is attention but after reading the sonic description in that review I wouldn't mind comparing them to my Constellations (which are currently powering the Magico Q7's residing one of my dream systems).

Lets face it QSC makes amplifiers that can run all day at that load if you don't mind the sound of a high capacity switch mode power supply. Not to discount the test but according to the review the power meter barely got off the peg in listening tests. If the manufacture stands behind the design who cares.

I trust any ultra high end audio manufacture to funnel profits back into the system more than some 1%'er, screw them. Besides, they're an important function of the used market. We need to stop wising up these chumps.
I am sorry that you interpret this as a melt down. The Momentum amplifiers normal operating temperature is 42-44c(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 70c (158f). The unit under test was not close to that temperature.Many amplifiers at higher temperatures than that.If John had continued his test the second amplifier would have passed witout any problems. The Momentum amplifier has more than enough thermal head room for any load or speaker. I was unable to give comment until the unit was returned to me from testing. Thank you for your concern.
Dan D'Agostino