D'Agostino Progression monoblocks replacing my Theta Prometheus monoblocks

"Here is Solutions Cyrill Hammer take on it also.
"if you want to have your product performing at the cutting edge it is not possible with today’s known switching technologies. In order to come close to the performance of the best linear design we would need high-current semiconductors that provide switching frequencies of several MHz or even GHz." "

And then it is no longer an amp, it is a radio transmitter.

Y'all have some fun,
Robert

isn't that was Spectral is requiring Mit Cabling.. into the mhz range

And then it is no longer an amp, it is a radio transmitter.

Yeah I think Cyrill is pushing it a bit high, a couple of mhz should do it, this way the class-d’s low order filter can do it’s job properly and not leave any residue of the switching frequency left in the audio band.

Like the Stereophile external bench filter they now use when they test Class-D’s square waves, it leaves no saw tooth switching frequency ringing on the tops of the square wave.
Trouble is that filter can only take a watt or so before it would blow. For it to work with today’s Class-d’s for the listener it would have to handle the full power of the amp, impossible.

Cheers George

I am very happy with the D'Agostino Progression monoblocks. I am not the first to mention how dynamic these amps are. This was evident listening to the CD Red Violin. Track 20 has some very loud orchestral peaks on the track. It was amazing to hear these amps reproduce effortlessly the dynamics on it. It was loud but yet I was able to hear every instrument clearly for the very first time. My ears will give out before reaching the full potential! It is the headroom you notice. I have noticed also that these amplifiers are very revealing of poor recordings. The ARC Ref 250 SE monoblocks I had on loan made the normally "poor sounding" discs listenable because of the tubes in my Ref 10 and the tubes in the amps. This is not necessarily right but expected with an all tube system. With the Progression monoblocks my well known recorded redbook discs sound fantastic with small little details not heard before in the recordings being heard now! With SACD listening to them now is definitely better and confirming the reason for having them to begin with! Listening to both male and female vocals they are smooth and natural with a touch of air on both. The better the recording the more is revealed. I am waiting for both of my Transparent power cords to be reterminated to 20A.