One thing I'd like to add is that it seems to me importance of DAC and amplifier raw audio performance is often overstated in 'objective' audiophile circles.
We don't really need anywhere close to 120dB SINAD to reach audible transparency in the vast majority of practical use-cases, especially not when used with loudspeakers in typical residential rooms (assuming optimal gain-staging, naturally).
E.g. in reality many residential rooms will have 40-ish dB SPL background noise, so SINAD of about ~80dB allows us to play perfectly transparently up to 120dB SPL (threshold of pain).
In reality even much less can still be perceived as transparent since people often have noisier rooms and/or don't listen very loud. This is why most of the non-broken consumer audio electronics work perfectly fine in most cases.
Naturally this is a bit of an oversimplification for the purpose of brevity, but I genuinely think it is useful to think along these lines to calibrate expectations. I guess it is also a clue why 16-bit resolution was initialy selected as standard for digital audio
While I can understand the "peace of mind" apeal of high(er) performing electronics, a function like room EQ will bring much more audible benefit in practice than a few more dB of SINAD.
I guess this is all part of the reason why the WiiM Amp looks like it might be such an amazing value in the current market, even if the amp section doesn't top the SINAD chart. Also why many AVRs are great value too.
On the topic of subwoofer integration, there are several feasible approaches with regard to crossover implementation, and in my experience most of them can result in good integration - but measuring is critical, and it is good to have some flexibility in positioning.
As stated by a few other members, room EQ / PEQ is critical for good quality bass - IMHO much more so than the selected subwoofer crossover approach.