New Momentum Stereo amp - S250
 

Here is an excerpt:


Daniel Dagostino

"After hearing the benefits of the enhancements made to the Momentum monos that resulted in the Momentum M400, I felt compelled to add them to the Momentum stereo amplifier. We are excited to announce the Momentum S250 stereo amplifier." - Dan D'Agostino


As with the Momentum M400 mono, the new Momentum S250 stereo amplifier receives a power upgrade, now delivering 250 Watts/channel into 8 Ohms. This is up from the original 200 Watt/channel specification. A 20% increase in transformer size, up to 1,800VA, provides the engine for this output power increase. Connected to this larger power source is a new output stage design that includes a number of major enhancements.

The driver section underwent a major revision and now features a fully complementary signal path with individual transistors employed for the positive and negative halves of the musical signal. Current drive is nearly doubled which feeds a new output stage with an open loop gain increased by the same factor of two. The sound is more spacious, delicate, and dynamic.

The Momentum S250 employs the same chassis as the original with a small aesthetic design change to the copper feature on the faceplate sides. Additionally, the meter now displays a scale appropriate for the greater power output.

Current Momentum stereo amplifiers can be upgraded to the Momentum S250 performance level. Included in the upgrade is the new 250 Watt meter plate and all electrical component upgrades. The retail price for the upgrade is $7,500 and is performed at the Dan D'Agostino Master Audio Systems facility in Cave Creek, AZ. Customers should contact their dealer, distributor, or Dan D'Agostino Master Audio Systems for details.
Full specifications, pictures, and more information will be on Dandagostino.com soon.

Thank you for your support.

Atleast it's nice you can upgrade to current level performance. Very cool

It's unusual not to have a fully complementary driver stage, so I'm surprised it wasn't designed that way initially.

The output stage sounds interesting. Typically, solid state output stages are emitter / source followers with 100 percent local negative feedback, so it's not usual to refer to "open loop gain" when discussing the output stage.

When Dan was in Melbourne a few years back just after the momentum launch, I did have the opportunity to have a brief chat with him and he was generous enough to let out a few of the Momentum's design secrets, but he didn't mention anything specific about the output stage, other than the very high level of transistor matching employed.

Fwiw, I've heard Momentum mono's on several occasions and always been impressed, although my personal preference remains for the the older FBP Krell's.