Here is an NRG Pro 3 stereo compressor Limiter for use on an LPFM radio station. This is placed between your sound source and your transmitter to boost your sound level and limit your deviation so you don't affect near by stations.

NRG is considered good quality equipment. These used to come in kitset form. A manual can be seen here; https://www.dropbox.com/s/jkhipwe5w4n1vp0/NRG%20Manual.pdf

It has RCA stereo connectors for input and output and a power lead for 12 volt supply. Power pack is not provided.

The unit is in a light aluminium project case - not flash but sufficient for job of protecting against outside RF interference.

Onece connected up there adjustments on the circuit board to set up for good functioning. The manual tells about the adjustments.

Can be couriered of pick up from Tokoroa town area