I tried to post a video that the OP sent me but Life in the Fast Lane is apparently Copyright protected on Youtube. Hopefully, he can get something else recorded & posted for analysis here on the forum.
With regard to his video, my ears were hearing a muddy sound with some harsh "highs". I can't tell if it's the quality of the video, the system components, distortion or the limitations of the fairing speaker pods.
The amp seems to be putting out some decent power (based on the volume achieved in the video) but, since I don't have any experience with the Diamond amps, I'm unsure of it's sound quality/characteristics.
If you send it to me I can upload it to my Vimeo account and post it.
If his hand or finger was not over the microphone on the phone then yes, its BAD. The volume seems ok, but we don't see how high the volume is on the HU. The sound is very muddy and screechy.