I spend quite some time to chase down the DXR noise issue.
Under ideal circumstances a little hiss can be heard. This is so subtle that it does not disturb me at all. Not a bedroom level and for sure not during rehearsal or live use.
Any louder hiss/noise is coming from the cables...don't blame Yamaha nor Kemper.
I got really annoyed one day when suddenly I was hearing radio noise ....but no radio was connected...just the Kemper. By touching the cable plug I could influence the radio signal
I then connected the Kemper main out with XLR to the DXR: Very low noise!
But normally I do run main out into the mixing console and have to use the Kemper monitor out. No XLR there! Just a normal mono plug.
I tested all my cables (appr. 30) to connect the Kemper to the DXR. DXR level was set to -3db
Best result was using a speaker cable which is normally used to connect my tube amps with a guitar cabinet.
But all cables were noisier than the XLR connection.....
Before I get on a shopping spree and order a variety of shielded mono cables....
.....What cable are you using? Instrument cable? PA cable? Shielded? What brand? Length? Are they quiet? Has anybody tried a XLR converter plug?
Would be great if we could find the ideal cable for the Kemper-DXR connection together!!
Regards,
Rainer
P.S. The ground lift switch was just changing the noise type...not make it quieter.