External laptop battery as a power supply for Minidsp 4x10 hd

Hi

This is my first post a I will soon be a new Minidsp customer. I recently purchased a Minidsp 4x10 hd from a French vendor and I am patiently waiting for it.

I read several posts dealing with Thump noise while turning off the device. I must say that I am currently facing the same issue with my actual digital crossover (Xilica XP3060). A way around was to turn it on first, and off last. This is not a big deal, except when the whole house is turning off suddenly !

This is why I was wondering if using an external laptop battery was not the good solution. The power path would be : wall -> ac PSU -> battery -> Minidsp. I found several external battery delivering 12 v. Had anyone tested this solution ?

Thanks in advance, and Merry Christmas !

Philippe