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Transformer based PSUs (in the link) sometimes do worse than impulse. I long thought otherwise, but transformers can underperform due to uneven wiring. For impulse PSU all you need is a big stabilizing capacitor on DC line. And proper grounding of jacks, board with the case.
This amplifier has a SINAD of 117 dB, so nothing is ever going to sound better than this.
Switching PSUs are trash. They generally have much worse ripple, they radiate EMI, the cause lots of high frequency noise and they dump a load of AC current into device's power system. Even an el-cheapo linear supply which is going to be better. 99% of serious audio equipment uses linear power for a reason.
Noise? Nope, no audible noise.
What if I'm telling you a lot of studio equipment uses switching PSUs lol?
Most studio equipment is garbage for people's bedroom "studios".
The noise is very audible and you would find that out if you switched out one of your power bricks with a linear PSU. They are cheap on AliExpress and eBay. Just read the brick's output voltage and amperage and then find the right size of LPSU . Have the seller set the right output voltage and done.
Does it matter that the power supply you’ve listed here outputs 2 A at 24 V rather than the 24V/1.8A power supply given by the manufacturer? Did you purchase the linked PS and can verify it works with the AAA 789? Thanks!
I can't personally attest to it but a +0.2A should be just fine. You can ask the seller to adjust it down to 1.8A assuming it has a tunable regulator capable of that. You can probably find one with the exact amperage if you searched around on AliExpress there's a million of them on there.