PocketADC
The miniDSP Pocket ADC is an extremely compact high-resolution A/D (analog-to-digital) convertor that accepts a stereo analog input on single-ended (RCA) connectors and converts it to SPDIF coaxial and TOSLINK optical digital outputs. This pocket size converter supports high sample rate and...
www.minidsp.com
if the quality and seriousness of the engineering is confirmed...will be a nice option to put the wiim with digital input...
(which seems to be possible at a low price...)
;-)