From what you describe, this isn't a ground loop, as a "crackling sound" is not a ground loop symptom. The problem is likely your preamp's output. I would sub another preamp into the system and see if you get the same effect.
Humming sound from my speakers
When I turn on my power amp there is a loud humming sound from my speakers. Although the sound gets softer after about 3 seconds there is still an audible hum. I don't think it is my peramp although when I adjust the volume through the pre amp you can hear a crackling sound from the speakers
My power amp is Audio Research VT 100 (tubes)and my pre amp is LS 15 (tubes)
Any assistance would be appreciated.
Thanks
Daniel
My power amp is Audio Research VT 100 (tubes)and my pre amp is LS 15 (tubes)
Any assistance would be appreciated.
Thanks
Daniel