From: VLX-400

[mdexxxiv 1]

It will go into protect after 15.4 volts. Don't run it on 18v's, it will go up in FLAMES.

Ok so I will stay at 14.4 I thought for sure this thing could take more, being a freaking HUGE.. lol

These amps were a product of the early 90's when 12 volts was pretty much all we had to work with. Those are even more rare than my old 50C.