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In Reply to: RE: Who makes GaN FET Amps ? posted by AbeCollins on July 15, 2023 at 09:48:07
I've just taken delivery of a pair of Atma-Sphere Class D GaN FET mono amps.Initial impression good, but it will take some time for me to evaluate it in comparison with Purifi Eigentakt that I have in the NAD M33
AGD do a tiny GaN FET mono amp known as the Audion
Edits: 07/16/23 07/16/23Follow Ups:
I'd love to get your opinion on the Atma-Sphere mono amps vs your current Purifi Eigentakt M33.
Will you be driving the Atma-Sphere with the preamp outputs from the M33?
Please keep us posted once you've had more time to compare. Thanks!
Yes, I'm using the pre outs from the M33 to the A-S amps, unfortunately via single-ended connectors. Sounding good so far, but I'll wait 2 or 3 more days before doing comparative tests.
I have an amp switcher so can change from the Purifi to A-S with the push of a button and volume adjustment as the Purifi is twice the power.
I could return my M12 preamp in place of the M33, but it would need the M50.2's streamer as source. Then I could go balanced between preamp and monos. I suspect the M33 may better that combination though.
If I take the next step that I'm planning - moving from M33 to M66, I'll be able to go balanced to the monos and could also feed the Avantgarde bass section via balanced XLR from 2 of the M66's 4 sub outs. I presume these sub outs will be 2 for left and 2 for right channel.
Have you used that amp switcher before with your M33 ? It could possibly cause a problem if the switcher uses a common ground but I'm not sure. NAD warns against grounding the blue speaker terminals.
M33 Manual Page 9 that I found on the internet :IMPORTANT NOTES
- The blue terminals must never be connected to ground (earth).
- Never connect the blue terminals together or to any common ground device.
- Do not connect the output of this amplifier to any headphone adapter,
speaker switch or any device that uses common ground for left and
right channels.
If you use the amp switcher [speaker output switcher?] you might want to power-OFF both amps for several seconds before you switch then power-ON only the amp under test.
Edits: 07/19/23
Thanks for the advice. Before buying the Beresford TC-7220 Mk III switcher, I checked with Mr Beresford who confirmed that no input is earthed and the action of switching is "break before make", so the 2 amps are never connected to one another. However the advice is to switch while no music is playing. Peter
Excellent. That switcher should make for easy comparison w/o having to wrestle with cables.
v
"Once this was all Black Plasma and Imagination" -Michael McClure
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