2. amps-preamps
  3. 168911-94555

GaN amplifier from GaN themselves limited supply!!!


There is this integrated GaN , made by GaN themselves, so you know it "should" be good.
(Could very well be the best of all GaN amps)
(single purchase only, not available for multi purchase for commercial Class-D manufactures)

But you’ll have to put it in a box, comes with all you need, the amp and power supply, and dac??!!!
(if you can build simple kits you can build this, would it quite simple to make up)
.
You have with it:
Volume control
3 x switchable inputs
2 x Analog stereo inputs rca & jack
2 x digital spdif inputs, optical and coax (yes it has a dac in it too)
And this is neat, user variable negative feedback!!! for those that don’t like too much for the sake of "better" measurements" and want a more organic sound, all for just $1.3K

https://gansystems.com/evaluation-boards/gs-evb-aud-xxx1-gs/

https://au.mouser.com/ProductDetail/GaN-Systems/GS-EVB-AUD-BUNDLE1-GS?qs=vHuUswq2%252BszP6hR0ubJmfw%...

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

Cheers George
128x128georgehifi
atmasphere's avatar
atmasphere
11,841 posts
 
Also the switching frequency still has to be 4 x higher so it’s filter remnants and phase shift are "well out of the audio band" as Technics did with their GaN SE-R1 and maybe their SR-1000 integrated has also.
This statement is false. If there is sufficient feedback, phase shift at 20KHz will be under 1 degree even if the filter is set at 70KHz.


Also, class D amps if designed as self-oscillating (ex.: Hypex) are inherently stable regardless of load as they are **already** oscillating due to the amount of feedback they employ. You can't somehow get them to oscillate again over the existing oscillation....
georgehifi's avatar
georgehifi OP
10,312 posts
 


Yeah, just throw more bandaid fix feedback at it. (just like the zero auto former you push for the OTL’s into hard loads)

Everyone know too much feedback is detrimental to the sound, that’s why that GaN by GaN Class-D measured by Amirm had "very little feedback on it" programed from the owner, for the sake good sound, but of not measuring too well in certain parameters. (get with the program) and you and your mate stop putting      on everything that’s in opposition to what you’ve got coming, not just on this thread I’ve seen but others too!

And btw you can’t cure this kind of -75 degrees! of phase shift (red) with      loads of feedback https://ibb.co/S06J7hf only a 4 x higher switching frequency will move that up out of the audio band!!!

rc22
133 posts
 
I see three camps here, but I've not read every post, so there could be more.   Two seem very knowledgeable but are on opposite sides of the fence with respect to the viability of this DIY GAN integrated "opportunity".

I am in the camp with Arch2--isnt' this stuff made with elfin magic that I do NOT posses?  Seriously, I view what Ralph and Ric point out as good examples of what I subscribe to:  You don't know what you don't know...  Until you study up and practice in a given area of endeavor...and then you do start to know what end is up.  I would like to build a speaker one day, but ignoring the fact that one could buy the parts and invest the time and be unhappy with the end result would be well ignore-ant. Lol.


georgehifi's avatar
georgehifi OP
10,312 posts
 


If anyone wants to read the "White Paper" on this $1.3k GaN by GaN stereo amp/dac/pre and power supply complete less case and connectors here it is.

Hard to get any hiend audio manufactures to give white papers on their products.
https://gansystems.com/class-d/?utm_source=press-release
Because you just can’t b*** ***t much with voodoo and snake oil in them.
(that leaves the "boutique AC fuse" lot out that’s for a fact)
https://au.mouser.com/ProductDetail/GaN-Systems/GS-EVB-AUD-BUNDLE1-GS?qs=vHuUswq2%252BszP6hR0ubJmfw%...

Cheers George

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