How much signal is my Pro amp missing out on if my receiver Pre out is only sending out a 1v unbalanced signal. Is 1 volt low enuff to justify the purchase of an art cleanbox? I am using an Onkyo receiver (TX-SR600) and an ep1500 pro amp. I just think the amp is not getting all the signal it needs even if its not lacking a huge amount. Has anyone else with an Onkyo felt need for a stronger signal to feed a pro amp?