I think its been established that the box is all wrong127.8 on that setup?
i've metered on dash at the local shop with 1 jl12w3v4 on 300watts at 135.8 with a 1.4cu ported at 32hz in the trunk of an chevy impala 2003..
might want to recheck ur setup man something is completely missed there... i'm running all stock elect. and was on 4g wire.