JBL EON 15-G2 Powered DJ Speaker With EQ Speaker "connect speakers piano" Questions

...and discovered it started barking somewhere around a low D on the piano. Turns out the mains connection was intermittent right where it enters the eon from the wall. Soldered the ac power ...

...from dynacord or hk audio! Hi, two things can cause the loud noise (humm). The cables and the connection of power. Cable can humm if it's not well fixed or the due to placing heavy object on it ...