People have been known to run their DSP XO on a PC or Raspberry using HDMI out and an AVR as multichannel DAC and power amplifier. Hard to beat in terms of a lean setup, but unfortunately, there's no such thing as a well implemented AVR.I am a friend of lean systems. Avoid anything superfluous. Smartphone as controller, Raspberry Pi as renderer and DSP (xover, room correction), DM7 as Dac, 4 channel Amp, raw Speaker.