Pull the deck, to bench test it connect entirely different amplifiers and speakers too, use different rcas, and a different power source (before sending it off for repairs). Please post your results either way.
Phoenix Gold ZX200
2 x 75 RMS or 1 x 250 RMS Bridged
Under-rated amp - lots of clean undistorted power to run your component speakers. I have also used a this type of amplifier to power my Focal K2P 6.5" components and they sounded excellent even at the highest volume levels.
I currently...
I have a set of these and they sound phenomenal and handle tons of clean power - for the price there is no better value IMO. If I didn't have 3 spare sets of 5.25s already I would buy these right now.