I am the buddy West is referring to, though I'd chime in here. I did have a problem initially with the amp cycling rather fast. What I think happened was the REM wire got knocked loose internally and wasn't making full connection. In any event, I shipped directly to Mr. Mantz, he fixed it, and Vertex Audio picked it up from his shop and shipped it back to me. I initially paid for shipping to Zed, but was later reimbursed by Vertex, and they paid shipping from their location to me, so my total out of pocket expense was $0. I am currently having the issue described. Here is a video of it:
What is happening is the amp is having to breifly reset whenever it switches from the high voltage rails to the lower voltage rails. The red light you see coming on in the video is labeled "VRDV", and indicates when the amp is utilizing the high voltage rails. This, I was told from someone who's talked pretty extensively with Mr. Mantz, was put in initially for his own troubleshooting, and is not supposed to be something the user should worry about at all. I do like it though, pretty cool to see just how loud I can get before it switches over. Part of the reason it's so efficient I'm open to ideas about this if anyone has them, too. In any event, I am working with the guys at Vertex Audio again, and I have no doubt this will get resolved. They are great dudes, I can't vouch for that enough. CS there is great, do not hesitate to buy from them. They can be a little slow to reply, which puts some people off, but they are great. They have an awesome trade-in program too Also, for those asking for more pictures, I've got a few in the first page of my build log here: http://mobileaudioforum.com/forum/showthread.php?2566-1999-Chevrolet-Blazer&highlight=1999+blazer