Join Date: Jan 2018
Originally Posted by 6L6
There are many positives, absolutely.
The negatives include -
Beat frequency interactions down into the audio band
Radiated noise (RF)
If one fails, the entire other rail will appear on your speaker as DC.
In the time being, issues such as this are why the linear supply will always be the standard.
These are not insurmountable issues, but do require some attention. There's been some look into it, and believe me, I'd love to see something like an interface board in the amp chassis that takes 2 of the external 24v 150w bricks that the ACA uses to make a bipolar, while providing filtering and shutdown protection. No AC wiring at all? That would be great.
However, as soon as you add complexity you add cost, and fairly soon the normal linear PSU doesn't look like a big deal anymore.
You mention a universal chassis where you don't have to worry about the supply - The last couple build guides have been exactly that.
Chassis/PSU/Transformer are all the same, I'm just swapping amp PCBs.
There' no question in my mind that there will be a solution to use SMPS in these projects with minimum or no downside. I'm looking forward to that!
Looking at your linked PSU (MW LRS-200-24) I'm very tempted to get two and just try it.
Thank you 6L6, Zen Mod and Shawnstium for all the info on switching mode supplies. I have entertained the idea for a high bias balanced mono F4s, particularly after seeing Soulution amplifiers with massive switching psus (for what is worth they use Meanwell HRP-600 series with -I guess- RC filters with massive caps)
Life got in the way, no time to start the project. Still, this has been a great read! Thanks!