Class D amps seem poised to take over. Then what?

.
...yes, but is Class D stable into 2 ohms?

...yes, but is Class D stable into 2 ohms?

Sadly not, like good Class-A/B's can be using BJT (bi-polar) output stages, especially in current delivery.

Cheers George

jbhiller
I’ve tried a couple class D units. They were good but not great to me. I’m game to try some more.

If you can get hold of a Technics SE-R1 flagship or at least it’s cheaper integrated the SU-R1000
The SE-R1 addresses the "Achilles Heel" of Class-D, (ultra sonic switching noise down into the audio band) Technics takes it up 3 x higher and so filters it up 3x higher also, which results in 3 x less switching noise in the audio band.
It’s been said the SU-R1000 integrated does it also, but not confirmed by Techinics.

These are the only Class-D’s so far to take full advantage of the GaN Technology’s far higher ability to be able switch 3 x higher.
Other manufactures using GaN are only half exploiting it, and still using the old 3 x lower switching frequency, like all other Class-D’s do since the 90’s, so really not much advantage using GaN if not used like Technics have.

This top pic is what the switching noise looks like on the output of a Class-D going to the speakers a 10khz square. https://ibb.co/qBnNwVJ
Now Stereophile use an "AP (Audio Precisions) temporary test bench filter" on the output to give the illusion of a cleaner bottom pic, and they never give the top pic anymore, this is done in my view as to to not freak potential; buyers out.

Cheers George

Grannyring,
I am 100% sure it will sound different. Every single thing you do changes the sound including jacks, wire, solder, chassis vibrations, etc. But, yes, they are using the exact same modules (except that Rouge is using mono modules and Legacy is using one half of a stereo module (exactly the same thing). Yes, you can see pics of the inside of the Legacy amp that verify this fact. Legacy are not doing anything to the modules....they do not touch them......it is quite clear from the pics. They do have a separate ground wire running from each module and they do scrap away the anodizing where they ground (standard practices). Basically, they are stock IceEdge modules in a box.....same as Rouge Audio. What I am 100 % sure of is that with my mods either amp will sound way, way better.....but still slightly different from each other.

https://systems.audiogon.com/systems/5078
Pic #11 shows the best interior shot. Click on the pic again to make it larger.....you can clearly see the amp channel on the top of each module is not hooked up in any way.  Totally stock stereo modules using just one channel for more power and better separation (same as using mono modules).

George,
Wrong, many class D amps are fine with 2 ohms (stable and otherwise) and one of my customers is driving 2.4 ohm Thiel 3.7s ......Fremer drove his 1.4 ohm Wilson Alexx with the IceEdge module without a hitch. Time to tell the truth, dude! Yes, some class D amps are not designed with big enough power supplies to drive 2 ohms or less. After all, how many speakers go down to 2 ohms or less.....mostly the big expensive ones that only the 1% can afford and with 97+db speakers like the incredible sounding Lii Audio drivers.....those big expensive boxes are now boat anchors.