Source: miniDSP DDRC-88D, selectable 4x SPDIF or AES
Use case: LX521, 4-way stereo speakers crossover
Must have: coax SPDIF or AES input
Nice to have: XLR, volume control
Candidates (based on low price, high ranking on ASR):
Topping E30
Topping D30Pro (expensive)
Soncoz QXD1
SMSL Sanskrit 10th...