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Mytek slams Hypex in Stereophile Amp Review

Mytek's chief designer, Michal Jurewicz, told me. "Hypex [class-D modules] cannot drive it, the amps collapse, but this Brooklyn Amp does it with ease."

https://www.stereophile.com/content/mytek-brooklyn-amp-power-amplifier

Which is pretty interesting, because the closest I could find to their specs is from ICEpower modules. :) 

I've not been able to do comparisons with Hypex vs. ICEpower amps, so I have no idea what this is about. I use both but certainly not with difficult speakers. 
erik_squires
erik_squires OP
16,049 posts
 
cheeg : 

My bad, I _thought_ that while sober I had seen the insides and it looked like an ICEpower module. I stand corrected, and obviously overlooked that in the article.

Thank you for correcting. 

Best,

Erik
erik_squires OP
16,049 posts
 
addyson :

Well, I don’t own stock and won’t make money either way, but that kind of attack in the press is really not one I am used to.

Anyone have experience comparing Pascal vs. Hypex amps?
georgehifi's avatar
georgehifi
10,312 posts
 
The Duntech Sovereigns are specified as being 3 to 4.5 ohms. That is well within what should be the Hypex’s comfort zone.

Not if there's a -50'-60' degree negative phase shift also at 3ohms, then the amp could be looking at nearer 1ohm.

Mytek ultimately chose an amplifier module from the Danish company Pascal

And this could indicate Pascal get them from China and mod them. As are Red Dragon and Rowand Research

http://www.pascal-audio.com/amplifier-modules.html

http://www.theaudiobeat.com/equipment/pics/jeff_rowland_continuum_2_large_inside.jpg

https://www.reddragonaudio.com/products/s500?variant=969867425

https://www.stereo.net.au/forums/uploads/monthly_2017_05/Capture.JPG.eecf146fa0c42ac376beb2799afd581...

Cheers George

erik_squires OP
16,049 posts
 
Not if there's a -50'-60' degree negative phase shift also at 3ohms, then the amp could be looking at nearer 1ohm.

Not exactly how this works, but yes, large phase shifts mean high currents near zero volts. Hard for most amps. Would be nice if we had impedance graphs for the Duntechs. 
georgehifi's avatar
georgehifi
10,312 posts
 
Not exactly how this works, but yes, large phase shifts mean high currents near zero volts. Hard for most amps. Would be nice if we had impedance graphs for the Duntechs.

There is a formula for it, on diyAudio somewhere, but as usual it was in my head while I needed it, but soon sieved out of there in a hurry, like rats on a sinking ship.

As for impedance graphs with -phase layovers, Stereophile is the only one to do this, but they never use the EDPR formula to give the real load the amp sees.

Only one I’ve seen do this is Miller Audio Reasearch Test Labs, when they did 3rd party Lab Report testing for HiFi News and Record Review, like they did on the Wilson Alexia, which managed an EPDR of just 0.9ohm!!!! in the bass.
https://www.absolutesounds.com/pdf/main/press/WA%20Alexia%20HFN%200313-4web.pdf

Cheers George


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