Nic,
Is it a good idea to make a custom 5 volt DC power supply for the Squeezebox 3? The stock power supply is similar to a mobile charger, giving lot of room for improving the sound quality.
It can carry the Opus 500 BPS with high grade film caps and oversized trannies with silver windings , cased in Merbau/ebony.
This can be similar or better to the one here:
http://www.boldercables.com/servlet/Detail?no=377
