Sabai, some questions, which regardless of the answers should not be interpreted as any kind of excuse for the poor behavior of the manufacturer and dealer. I see that you use a Rel T3 sub in your system. How did you have it connected when the Hegel was in the system?
The Hegel is a fully balanced amp, and its negative output terminals therefore have a full amplitude signal on them, as opposed to being grounded. Therefore if you connected the T3's speaker-level inputs to the amplifier outputs, including the ground wire from the T3, it could very conceivably have caused the symptom you have described, depending on the internal grounding configurations of the sub and the amplifier. It might have even caused damage to the amp.
Also, if you connected the sub at line-level, what preamp or other component were you connecting it to, and were the connections between that component, the sub, and the Hegel balanced or unbalanced, and by any chance did you use an XLR to RCA adapter or adapter cable for the connection to the sub?
Regards,
-- Al
The Hegel is a fully balanced amp, and its negative output terminals therefore have a full amplitude signal on them, as opposed to being grounded. Therefore if you connected the T3's speaker-level inputs to the amplifier outputs, including the ground wire from the T3, it could very conceivably have caused the symptom you have described, depending on the internal grounding configurations of the sub and the amplifier. It might have even caused damage to the amp.
Also, if you connected the sub at line-level, what preamp or other component were you connecting it to, and were the connections between that component, the sub, and the Hegel balanced or unbalanced, and by any chance did you use an XLR to RCA adapter or adapter cable for the connection to the sub?
Regards,
-- Al