I was looking for a solution to distribute output from Sonos Connect (new model is the "Port") to 4 audio amps (old school Kenwood and Pioneer amps). I had previously attempted this using CE Labs AV700 but that unit made a sharp sounding crackle/pop in all connected speakers and a powered subwoofer when power was switched on so that unit was returned.I then came across the this product, the Rolls DA134. I expected a plastic, average quality component but this is much nicer than that! It's got a metal cabinet, nice components and excellent build quality. For my application I have this unit switched on along with the bank of audio amps and am not able to detect any additional noise to the signal path when powered on or while operating. The sound out of the in-ceiling speakers has improved given the stronger signal entering the amps versus the passive patch cable splitter approach that I previously had in place (2 Sonos Connects, output split to go to 2 amps each)The included power supply works without issue, and as others have noted the tip (-) and sleeve (+) of the DC end of the power supply are opposite the usual convention.Strong recommended purchase for this type of application.