In my experience with SSB there are many different factors involved; transmitter, microphone, power and audio source. I've never been able to turn on a transmitter and have it operate optimally without fine-tuning. Mic gain, compression, processing, ALC, etc. Your 930 should have a monitor function, put on the cans and see how it sounds, adjust it.
A good starting point would be the radio manual, then adjust accordingly.