Hi

I have z5500 for quite some time now, but decided to use them for practicing just now.

I have problem with hookup.

There is a loud humming sound coming from speakers. As soon as i disconnected power cord from pa2x sound is gone. I know that ground in my house is OK because i double checked that with electrician(friend of mine)

I tried to use both phone and lest out outputs but its still the same.

DO u know guys what can be a problem?

Thnx