I have a complete Cyrus system comprising of a CD8x, Dac XP, 2 power supplies and 2 monoblocks. I bought the ProAc studio 140's to go with this system and the results were frankly awful. The sound was very coloured and the bass flabby, much detail and neutrality was lost. A friend lent me some Jamo Concert 11's, a £2400 floor stander from about 5-8 years ago. The improvement was night and day. Detail, clarity and imaging were excellent. As a result I bought a pair of these second hand for £700 and sold my ProAcs that were only 3 months old. The ProAcs work well with the likes of Naim gear. For Cyrus, avoid at all costs.
Wow i was in amazed to read the above comment by Hayes 2 i have Proac140 biamped to a cCrus smart power and av8vs with a Arcam C D 82 and a Rel 150 subwoofer,xtube400 speaker wires ( 2 sets ) and nu diva interconnects sounds G R E A T to me, really Great!