I've finally come back to add a little personal experience to my question about pairing a Topping TP20 with the Super 3XRS. It's a nice little single input TA2020-based T-amp with maybe 6 watts of clean power with the included 14V power brick. I know there are newer chip amps guys are raving about but this one was reasonably priced at just over a hundred dollars, pre-built, and the included universal switching power supply means I can use it anywhere by merely replacing a power cable.
The rest of my system is a computer feeding an Audio-gd NFB-1 DAC through USB, to an Audio-gd NFB-6 preamp/headphone amp. With the preamp behind the TP20, there's a little more warmth and fullness/weight while retaining the detail. Currently, it's there because I already had it for my headphones and it gives me a remote control. I know spending four times the value of the little T-amp on a preamp like this doesn't really make sense. Later I intend to use the preamp in combination with a higher end power amplifier.
I'm using some decent Belkin PureAV PCOCC speaker cables and interconnects, which though clear and immediate improvements over some other cheap OFC cables, probably aren't on the same level as what many of you guys are using.
My experience in audiophilia began with headphones (cuz I was single and it was cheaper than a good set of speakers). This is my first really nice set of speakers. They've got over 100 but probably fewer than 200 hours on them.
This will not be the last amplifier I buy for my 3XRSes. This amp is the weakest component in my setup and is an interim solution that is letting me get some good sound. With that in mind:
First, the build quality of the unit is just okay. I'll leave it at that.
The detail retrieval is extremely good for the price. The differences between different audio files (YouTube vs 16/44 vs 24/192 vs DSD), audio players, and audio software output modes is readily apparent. Having experienced multiple systems of family members with more of a home theatre bent, I know there is more bass out there to be had in the wide world of audio systems. However, for a subwoofer-less setup with 6 watts powering a pair of 4.5" drivers, I feel the bass is very good. The system goes plenty loud enough for my apartment living situation (90dB peaks are no problem and, to be honest, more than 85dB or so is already pushing it beyond my comfort zone), and even this little amp is enough to make the 3XRS soundstage huge-ly.
It might be the speakers more than the amp, but for now, my girlfriend is getting sick of me saying how good things sound instead of how much I want to upgrade or change something.