Report AMM-1 Software Upgrade? in D'Amore Engineering - High Quality Car Audio Installation Tools & Accessories Posted September 13, 2017 · Edited September 13, 2017 by TonyD'Amore If you want to send your to us we can reprogram it for you with v3.93 and send it back. What has happened with the AMM-1 is that it was originally intended for use with sinewave sweeps and music, it originally shipped with v3.8 firmware and all was well. After people started playing with the AMM-1 they started doing sine-wave burps. When these burps are done with a Class D amplifier it causes a nasty back EMF spike when the burp stops. The AMM-1 would read this nasty spike and calculate power and display it. So someone testing a 1000 watt amp could burp it and get a 10,000 watt kick back spike the AMM-1 would display 10,000 watts. So I started working on that problem and kept making engineering code revisions until it was solved, this was v4.0 firmware. So we started programming them with 4.0 in production. After people started getting them and using them they sometimes had trouble reading music with them. (it's pretty tough for the computer and code to tell the difference between music and a spike as music sometimes is just a bunch of spikes) So I started back tracking through my revisions until I found a version that reads music but can ignore spikes. You want 3.93 firmware. This is the best working firmware (can have spike problem on rare occasion) but works with music and shows impedance and power on the same display page.