The description of the Squeezebox2 is on the web:

http://www.slimdevices.com/pi_specs.html

The information below is quotedfrom there.

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The analog sections of these things are probably not that great,

Analog RCA outputs

* High fidelity Burr-Brown 24-bit DAC
* Two dedicated linear power regulators for DAC and line-out stages
* Full 6.0Vpp line-level signals
* Signal-to-noise ratio: over 100dB
* Total harmonic distortion: less than 0.003%

but one that could feed an outboard DAC might be really something.

Digital S/PDIF outputs

* Optical and coax digital connections
* Dedicated high-precision crystal oscillators (no PLL, no resampling)
* Standard IEC-958 (S/PDIF) encoding
* Optical connector: TOSLINK 660nm
* Coax connector: RCA, 500mVpp into 75 ohms
* Sample rates: 44.1Khz, 48Khz
* Audio format: linear PCM, 16 or 24 bits per sample

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