Both channels up and running. Comfortably driving a pair of LRS+. The sound….is a thing of beauty. Lottery amp on steroids. Magnepan should demo with these amps.
Superb dynamics and low level detail. And best controlled bass I’ve heard on the Maggie’s so far - mainly Class D used previously.
Cautiously biased at 2.3A. Sadly the chassis’ are not mine so this is only a temporary home - hence the power and input connectors out the IEC inlet hole.
Babysitters are running continuously in low-noise mode and heatsink temps outside/opposite SITs around 63 degrees C. Probably need 5U’s. Awhile ago, while looking at a pair of ISO Acoustics stands I had, it dawned on me that the Noctua fans I’d bought (to satisfy ZM 🙃) fit perfectly in the center of the stands. All I needed was a means of support. Four corner supports that slip over the stand’s uprights were 3D printed and it worked out well - stands get the amps up in the air sufficiently to allow good inflow under the fans and the chassis allowed almost exact location of the feet to fit the stands. Fans are completely inaudible a foot away - 8.6dBA with the reduced speed low-noise cable that came with them.
Now I have to decide which limb to part with to acquire two 5U chassis.
You were right, Ben - I love the sound. Thanks again for the boards and your efforts. And, to Papa, I hope I get to thank you lots more for all the fun and great designs - these SITs are…magic!
Superb dynamics and low level detail. And best controlled bass I’ve heard on the Maggie’s so far - mainly Class D used previously.
Cautiously biased at 2.3A. Sadly the chassis’ are not mine so this is only a temporary home - hence the power and input connectors out the IEC inlet hole.
Babysitters are running continuously in low-noise mode and heatsink temps outside/opposite SITs around 63 degrees C. Probably need 5U’s. Awhile ago, while looking at a pair of ISO Acoustics stands I had, it dawned on me that the Noctua fans I’d bought (to satisfy ZM 🙃) fit perfectly in the center of the stands. All I needed was a means of support. Four corner supports that slip over the stand’s uprights were 3D printed and it worked out well - stands get the amps up in the air sufficiently to allow good inflow under the fans and the chassis allowed almost exact location of the feet to fit the stands. Fans are completely inaudible a foot away - 8.6dBA with the reduced speed low-noise cable that came with them.
Now I have to decide which limb to part with to acquire two 5U chassis.
You were right, Ben - I love the sound. Thanks again for the boards and your efforts. And, to Papa, I hope I get to thank you lots more for all the fun and great designs - these SITs are…magic!
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A month ago ZM asked me if it is da pudding in there and here is a proof with some sweet sugar.
So, let's talk about these fantastic factors: Iq, my trusty 1.45 A companion, and it's a real trooper,
staying steady after a whole 35 minutes - no wobbling, no shaky legs, 0 mV +/- 1 mV offset only.
And when it comes to powering up and down, it's a real drama queen. On the way up,
it lets out a tiny "excuse me" in the form of a very light fart (well, we all have our quirks).
But when it's time to power down, it's like a ninja in the night - absolutely no signs of its presence.
In the world of real hardware, Iq is my unsung hero, and those quirky power-on moments just
add a touch of charm to the whole shebang. And now some porn of the nacked queen on the test bed
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Yes, the aim of this exercise was to eliminate the huge capacitor at the output and reduce the dissipated power with the bias current to a reasonable level (Pq < 70W and Iq < 1.5A).
At the same time, the performance in the first watt range should be maintained compared to a single power supply with an output cap
At the same time, the performance in the first watt range should be maintained compared to a single power supply with an output cap