Carlos,' I use my 520's with a pioneer a30, caiman mk11 with breeze audio power supply to great effect, though I'm looking for a more gutsy amp, I've a thread going in this section. I found they're very picky about positioning,finally settling on tweeter outside firing straight on, mite be worth a play ? They drove me mad for a while though jim
novafidelity x40 music server/pre/dac, Arcam A39, roksan k3 power amp,Monitor Audio Monitor 50, Dali spektor 1, van damme interconnects and speaker cable, roskan k3 CD player