I have just received and I am listening to my muse tda1543 x4 in my headphone rig (usb asynchr VLINK II -> toslink muse tda1543 x4 with linear power supply 12V/1A ->Schiit Lyr + hifiman HE-4 orthos)
As you can see above muse has the best possible conditions to work (linear power supply and perfect digital input signal (jitter) with full galvanic isolation thanks to toslink)
From the first notes this is amazing experience how smooth female vocals can be comparing to delta-sigma dacs, everything is so natural and effortless despite of low parameters on paper
Amazing soundstage and depth, thrilling timbre and realism
I have one question, from time to time there is small distortion when there is high dynamic peak - have you experienced that ? I read something about bad value of output resistor (when there are several tda1543 together)
I can easily remove and solder proper one - will that help ? Could you help me identify it if I put the photos of the inside ?
I was also thinking about shorting output caps since Schiit LYR has DC servo inside (so should be input and output dc coupled if I am right) - what do you think ?
Checked everything inside, 2 chips didn't even touch the radiator - resolder some caps and corrected that ... now cooling of all chips is great
Checked Vout @ LM317T - 7.68V, come on, it gets extremely hot also ...
PCB from 2010/01, DC JACK says 15-18V (but unit comes with 12V power supply, I am using my own linear power supply 12V/1A - maybe the voltage is too low now ? shell I use 15V ?)
2x680Ohm @ outputs -> I think these are responsible for clipping when there is some dynamic peak or near 0dB recording ... but I don't know whether I should use 250 or 460 ohm resistors from what I have read (I would also decrease LM317T output voltage - I guess this voltage is used by the tda1543 chips, is it R01 ?)
Edited by magicman - 3/1/13 at 10:35am