AFAIK the high level inputs on the EP600 are meant for use with speaker outputs from power amp, not line level from pre-amp.

There should be some line-level aka low-level (RCA) inputs on the EP600 as well IIRC. Depending on the vintage there *might* be XLR instead of RCA - if so then I think you would want an RCA to XLR connection.

RCA to banana feels like one of those "if you think you need one of these then step back a minute" things smile

M60ti, VP180, QS8, M2ti, EP500, PC-Plus 20-39
M5HP, M40ti, Sierra-1
LFR1100 active, ADA1500-4 and -8