70V Compression driver static

I've bought a Dayton Audio D1075T compression driver for a reentrant horn, and ive hooked it up to an atlas PA1001G amplifier, but there is always a static/popping sound coming from it. Occasionally the sound will go away, but a few minutes later it will come back by itself. I'm unsure if its an amp problem or a driver problem. Thanks!
 
The compression driver should only reproduce the output of the amplifier.
Static/popping sounds could result from noise picked up on the external audio source plugged into either the RCA or Balanced inputs.

If nothing is plugged in to the amp, the inputs are unterminated, and the amp will pick up external noise, the level of that noise will vary with the level of the input gain.