Another website published some incorrect information about the AMT3000 and AMT5000 transmitters with regard to their on-board audio processing.
The author mistakenly claimed that the on-board audio processing on the two SSTran units cannot be disabled, and so defeats any advantage from an outboard audio processor.
The truth is just the opposite. Let's take a tour.
Both the AMT3000 and AMT5000 have a built in compressor which can be set between 1:1 and 5:1. Perhaps what the author at the other site doesn't know is that "1:1" means "no compression". When the control is turned fully counter-clockwise the compression is disabled, which of course allows full un-hapered use of an outboard audio processor.
Another control, the modulation control, is in fact a limiter. When set according to instructions it prevents overmodulation no matter how loud the input is set. Most transmitters don't have a built-in limiter, and they can easily be over-modulated UNLESS an expensive outboard limiter is added and calibrated, but sound quality is no different doing it one way or the other.
Be careful what you believe unless you read it here at part15(dot)us.