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I have done all the standard error search before I post. So yes left speaker got signal from right mono amp and vice versa. Other amps are also tried. Make no difference.

Nope ttocs. I have of course tried to run the other speaker with out jumpers and/or connection to the amp. No hum what so ever. My plan was to check the internal amps and see what happen if I disconnect first one driver, listen, plug it back and disconnect the other driver and listen. I suspect...

I do drink a lot of coffee...........:-) and the amps keep it warm...

Hello Lightloopy. Thanks for your reply. I dont think it is a ground issue. With the speaker in standby or with music playing then pulling out one jumper the hum appears. I am in contact with ML. Next step for me is to try to isolate/narrow the problem. 1) check if both lf drivers hum. 2) remove...

Hello. Just bought a nice set Summit’s in mint condition. Listened to them at the sellers place - sounds fine. Returning home I ran in to a strange error. When one of the Summits was connected to the mains only and without the jumpers it is humming. When I then mount the jumpers the hum is...

Talking about dac’s. A MHDT dac with ex. PCM1704 or TDA1541 out of the box is a good bargin. Adding a top notch tube makes many so called high end dacs to be a joke. It is possible and easy just to replace the IC to grade A versions. The over average standard supplied tube GE5670 can with a huge...