Do not understand why everyone wants a spare battery. Power comes from alt with vehicle running. Buy a good battery under the hood and that's it unless you listen with key off.like competing.
Truck is a nissan titan but no power windows or locks.would like ho alt but money always an object.I can always upgrade later.I'm very satisfied with the brx but its not strappable.and this is definately a never ending hobby or addiction!
Right now I have a hifomics 2000 brx and it seems to be close.also I'm running at a 1 ohm load.any differences in efficientcy vs say a soundqbed.don't want a ho alt at this time.