Class D


Been thinking of trying a D amp to reduce clutter. Most that I see are not rated at 2 ohms.  My PSB Stratus gold's will drop to 3 ohms or lower at some frequencies. So my question is will these types of amps handle this impedance ?
Thanks in advance. Chris
128x128zappas


Must be soon, you really have gone into full product protection mode, and there’s no stopping you.
Good luck is all I can say, for your new Class-D venture.

And Class-D technology has not progressed as much as you want all to here to think (for sales), sure the GaN transistors that I first showed here years ago as a far better alternative for Class-D, you were quite negative about back then, and now you say you use them. How ironic.
I first showed the GaN power transistors from EPC (https://epc-co.com/epc) inventors of the Mosfet, to all here many years ago, and yes they have improved things a little, but the only one to use them fully and make a dent in Class-D’s Achilles Heel "switching frequency/switching noise/phase shift" has been Technics with the SE-R1 and hopefully the new SU-R1000 integrated has the same genes.
Do what I did. Call a tech/sales rep at Sweetwater. Couldn't be nicer and more thorough if he tried. The first purchase was a Crown XLS 1502. Really couldn't be more pleased with that unit. Quiet and tons of headroom; ran a set of Ohm Walsh 5's like nothing. Those have been sold and replaced by a well loved pair of JMLab Mezzo Utopias with a little preamp and a Crown XLS 1002 which to my ears produce nothing less than aurel bliss.
Good luck.

Please don't be stupid.  It is stupid to respond to George.....he is a rock....he will never move from his position.....and he has to have the last word.......so it will always go on and on and on.  Don't be stupid....he does not want to learn....he just wants to be right.  Let it go.....let him go.  Just let him post what ever nonsense he wants and pretend it does not exist.  You will be much happier, if you do.

What we really need is feedback from those that have listened to the latest class D amps versus the latest class A and class A/B amps (within the same price ranges).  We need actual listening test impressions.....not all this guess work.....it is just a bunch of noise.

The Technics amp that is about to be released has tons of stuff inside that could make it sound great.  Technics does not even mention 1.5 meg or phase shift in their literature.  This thing could be really fantastic.....but there is no way you can say it is because of 1.5 meg or phase shift.  Please read all the info....very revolutionary.  It has 4 switching power supplies that switch at 500K....It is not really a standard class D at ALL.....it is fully digital (like the original Tact amp and Lyngdorf).  It takes an analog signal and converts it directly to high speed PCM and does all kinds of low jitter manipulations to make the distortion go down.  The PCM signal is then changed in software directly to PWM (class D).  Please read all the lit.

https://www.technics.com/us/products/reference-class/integrated-amplifier-su-r1000.html

https://www.technics.com/us/about/press/releases/20200901-su-r1000/index.html

https://www.youtube.com/watch?v=b-BJifbtjbI

George did start a thread on this new goodie....so when this comes out and people have listened then we will have a REAL idea of how good it is.  It looks great....I do hope it sounds great too.
They essentially are making a power dac, and as opposed to simply switching fast like the aforementioned rock has indicated, they characterize the load and appear to implement digital filters to compensate for the phase shift.


Build your own GaN based 200w 8ohm stereo power amp

For those who have experience and can kit build, here is from the ones that made GaN technology happen for Class-D.
A ready made 200w @ 8ohms 300w @4ohms stereo Evaluation board for $1k.
Stick it in a nice ready made Chinese chassis add a powersupply and your up and running.
I don’t think they used the 1.5mhz switching like Technics did, but it should be as good if not better that anyone else’s that will be much more expensive

https://gansystems.com/wp-content/uploads/2020/05/GS-EVB-AUD-xxx1-GS_Technical-Manual_Rev-200526.pdf

https://au.mouser.com/new/gan-systems/gan-sys-gs-evb-aud-xx1-gs-audio-evb/

https://au.mouser.com/ProductDetail/GaN-Systems/GS-EVB-AUD-AMP1-GS/?qs=vHuUswq2%252Bsym8eVHEaFTmw%3D...

Cheers George