The CXA61 has a versatile set of inputs for use with modern digital sources (bluetooth with aptX HD, USB, 3.5mm). It's not so good with Apple Bluetooth sources if you want to push the fidelity limits of the DAC though (no AAC support). You'd also better trust your neighbours if you're using bluetooth, since it doesn't require any authentication when pairing. It's also annoying that its USB 2.0 type B socket won't accept a 3.0 type B cable (or the ubiquitous type C), which means purchasing a cable that isn't useful for anything else (but it keeps the audiophile snake oil industry profitable?).
The output works well with Monitor Audio Bronze 50s, with details audible from about 9 o'clock (10%?) on the CXA61's volume dial... though I use it at a much lower volume. The 3.5mm output also works fine with my ATH-900 headphones - though it's not distinguishable from computers in terms of fidelity.
Be warned: with just convection cooling, the outside of the amp runs pretty hot (top about 50 degrees) even with just headphone output. It needs airflow like an open window to keep it near ambient temperature, which makes me suspect it's wasting a bunch of power - probably nice in winter though!