Parasound Preamp

I picked up an “Open box” deal awhile back. It’s a really nice pre, with good connectivity, and a descent DAC also. Very quiet background, nice remote and HT bypass. 
I have a Rel sub and have tested the sub-out with a longer balanced cable with impedance matching transformer at the sub end. Works like a champ, but I still prefer the Rel “high level” input. 
Any specific questions about this model?

I have this preamp and use it with the Halo A21+.  I am very pleased with it.  The DAC is pretty good, although I use a separate Denafrips DAC.  The phono preamp is also good.  I do not use the subwoofer output. I use REL subwoofers and speaker outputs to the subwoofer.

First look at the picture of inside of that preamp don’t give me any optimism. 

After purchasing the P6/A21+ combo, mainly based on features, looks, and the advice of someone I used to trust; I will most likely never purchase another piece of Parasound gear again.

The P6 pre in particular is boring, flat, and lackluster sounding. Def, mid-fi in my book. I A/B'd it directly with the Belles Aria pre and the Aria thoroughly embarrassed it.