Dan d'Agostino MOMENTUM: Sonic Character like pure ClassA/SE despite low Idle Power ? - Page 2 - diyAudio
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Old 18th October 2011, 12:26 PM   #11
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I question if it is indeed class AB?
Why the mention that the output devices RUN at 68mHz then?

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Old 18th October 2011, 01:03 PM   #12
adason is offline adason  United States
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i have no idea what that 69MHz has to do with anything...unless its a classD amp

this is what I found on the web:
"A 1.2kVA power transformer is packed into the compact chassis and in the tradition of Krell, the company that he cofounded 30 years ago, the new amplifier puts out 300W into 8 ohms, 600W into 4 ohms, and 1200W into 2 ohms, all with class-A/B biasing. Yet, there was nothing about this system that sounded like class-A/B amplifiers. Driving Wilson Sashas, the sound was warm, fast, open and generous—tonally and spatially. Voices all sounded balanced, life-like and three-dimensional. Dan told me a matching preamplifier is on the way. "

...it talks about class AB

its surprising how little dan talks about real circuitry, mostly about the aluminium body and copper heatsink and watch like power gauge...marketing, all is just marketing
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Old 18th October 2011, 01:30 PM   #13
MiiB is offline MiiB  Denmark
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In the interview he talks about a low feedback design with only 8-10 dB overall feedback, but more around the output devices that need heavier feedback to perform well...sounds a bit like two split feedback loops..

He was also talking about plateau bias, so that the bias changes with the signal.. and climbs with the level..as it's called for...(may not apply to this product).
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Old 18th October 2011, 02:49 PM   #14
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Look Ma, i like to parallel stuff : http://www.bm.rs/Agostino/Agostino%2...uly%202011.pdf
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Old 18th October 2011, 02:50 PM   #15
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because I haven't a broadband internet connection (very slow downlink rate) I am looking for a text about the interview about
Dan D Agostino Interview..... Papa is one of the best !!!
to reading this Interview.
Perhaps then one know more about the basic internal circuit topology.
Independend of this - I have heard about a simplified schematic anywhere on the web.
Perhaps one of the members here know the appropriate URL.
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Old 18th October 2011, 05:31 PM   #16
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wonder who he hired to do the design...



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Old 18th October 2011, 05:40 PM   #17
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How's about Mr Levinson ?
NÓÓÓÓh.
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Old 18th October 2011, 05:46 PM   #18
adason is offline adason  United States
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Quote:
Originally Posted by jacco vermeulen View Post
Look Ma, i like to parallel stuff : http://www.bm.rs/Agostino/Agostino%2...uly%202011.pdf
thanks for the link to the review Jacco
dan's amp distortion is not that impressive
even my 30 years old JVC AX3 has better parameters at 0.007% distortion

one thing I hate about all those idiots using the phrase "blistering 69MHz"
like it has anything to do with audio...
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Old 18th October 2011, 05:58 PM   #19
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Quote:
Originally Posted by adason View Post
amp distortion is not that impressive
Actually, the distortion figures/graph of the Momentum are pretty interesting.
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Old 18th October 2011, 06:30 PM   #20
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Looks like a fancy bathroom scale
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