I have a L1 Model II with the toneMatch audio engine. I started hearing a very high frequency noise at a low volume coming from channels 4/5. When I mute the channel the noise goes away. No other channels have this problem. It seems to get louder when the system heats up. I started noticing it after just a few days of use. Has anyone heard this before or seen any post on it. thanks ck

ck,
Thanks for your post. This issue seems very unusual and we would want to verify that the issue isn't outside of the T1. I would like to start by asking you some questions: What do you have connected to this channel? Does the trim light indicate any other color than green? How are you connected to channel 4/5 (1/4" or USB?)Does this issue get worse when the power stand heats up or the T1 itself? If you could answer these, we would be much appreciative so we can help you out in the best way.

Thanks,