Why would the gain be the same for single-ended and balanced inputs if they accept different signals with different max voltage? I don't know how this amp was designed, but I would expect the RCA inputs to be more sensitive so that max volume could be achieved with either. Perhaps that's not how...
Yes. My challenge when using the E50 + L50 stack with active monitors is that I prefer to use the L50's volume knob when listening to headphones, which means setting attenuation at or close to 0 dB on the E50. Unfortunately, unlike my Topping Pre90 and DX3 Pro+, the E50 does not "remember"...
I've (thankfully) not had any problems with mine so far, but if I did, I'd be ringing up the place from which I purchased it (Apos, in my case). I would not expect company reps to be watching this forum and proactive opening support cases based on feedback or experiences documented here.
I wonder if this could be the answer to what went wrong with the PA5 for some folks.
If so, leaving the power brick plugged in continuously seems like an easy fix.
Ah. Precisely what I've been doing for both the PA5 and (after seeing it in "blinking white power LED mode" once) the L50. I suppose this should be obvious, but it would be nice if Topping added this to their diminutive instruction manuals…ideally on the first page.
Sorry to hear that you're having problems. Where did you purchase yours from. I bought mine from Apos in Santa Clara, California. I've not had to use their two year warranty service yet, but I do not anticipate any issues. Their post-sales support, where I have had to use it, has been great so far.
The XLR/TRS connectors look pretty normal to me. Often found on pro audio gear. It's easy to find 1/4 in TS to RCA adapters if RCA is needed. Would have only cost Topping a few cents to include a pair in the box. :)