I own a Venue DI which I tried to use in church practice last night for the first time. I could not use it because the unit introduced noise, it was not feedback type of noise or hum, it's hard to explain, it was more like a mid to high frequency whine . The guitar is a Taylor 814ce which I normally connect to the house using a cheap DI which causes no problem. I tried switching the phase and the ground lift, but no luck. I have tried the unit at home through a Fishman Artist and it does cause a problem.

Are there any tips you can provide to try to start figuring out what is going on?

I will greatly appreciate your response.