Music systems & Paging Systems

Hey all,
Im new to this forum and new to the audio world. I inherited the role of audio guy for the business that i work for, Im their system administrator. so i am no expert and im still learning alot in the audio world. I have built a couple of 70 volt systems for their stores. My current issue with a couple of systems is a buzzing coming from the paging module. The paging module i am using is a Bogen Tamb 2, the device is not grounded and im thinking that im hearing the electrical interference that's going through the device. when plugging in from our audio device directly into the amp the buzzing sound goes away completely. The Tamb 2 uses a 24V ungrounded DC adapter. All speakers are calibrated with their tap settings and do not exceed the output wattage of the amp. I have about 30% system wattage left over so the amp isn't overworking to meet demand. Do you have any suggestions to this issue? Would an inline capacitor help? I am using Grounded RCA cables and use the "Ground slot" on the tamb 2's output connector that goes to the amps RCA inputs. any help would be greatly appreciated.

Thanks in advance,
-Dan

 

Trying to diagnose a problem like this at long-range is pretty much impossible, but I assume the system is connected as per the Tamb 2 manual TAMB2 Manual (bogen.com)

What you must NEVER EVER do is to remove a ground/earth connection from something that is earthed. It might cure the noise problem but risks killing somebody if there's a fault.

From what I can see, the Tamb 2 expects that the amplifier will have a balanced input, or a balancing transformer used if the amplifier's input is unbalanced. If that's not done, then perhaps that's your problem.

Sorry I can't be more helpful, but this is pretty specialised equipment, and remote diagnosis isn't easy.

S.

 

Thank you for your feedback! yes it is connected as per the manual, lol i figured it would be a shot in a million to diagnose. I didn't know if someone had come across this issue with this equipment before. I agree i would never remove the ground from something that is supposed to have it. I will definitely look into a balancing transformer this current set up has a basic amp that was installed before my time. Its a pyle PT8000ch. i don't see anything on this amp or in the manual about balancing inputs so im guessing this is where the problem may lay.
thanks again!