I put the voltmeter on the anti-thump connector and yup, I get 12v almost immediately after power up. Grrrrr.
This time I fired up the utility that mini-box provides. It still shows 18v coming into the unit even tho I know it's 12. But I started playing with the other portion, where you can "Send Message" to the unit. You select a parameter and it shows what it is. If you want to change it, type in the new value and hit the "Send Message" button to update. This is, of course if you have the USB cable made up and connected. Amazingly enough there is a setting for anti-thump and the default is 3000 ms(3 seconds). I changed it to 15 seconds and "sent" it. It accepted the command. I then powered off.
Guess what? It works.....well, sort of. It still puts out 12v a few seconds after the ignition on signal, drops to zero, then waits the 15 seconds and puts out 12v again. I don't know if the initial power on would cause any amplifier thumps or not. When you remove the ignition signal, the computer shuts off/hibernates, waits another 15 seconds and then kills the 12v to the amp. I don't think this is right because when Windows shuts down, it generates some thumps at power off.....while the amp is still on. Anyone else want to verify what I'm seeing? There are a whole bunch of other settings you can change, but most I'm currently not that interested in. The anti-thump setting affects both startup/shutdown. I'd like to see those broken out separately. When shutting down, I think I'd like the amp to die right away, long before Windows starts doing its thing.
Maybe 1.2 or later versions can resolve these anomalies. I'll try to fiddle more later in the week and see what kind of results I get.