"So - if the subs have their own amplifier, then both the main amp and the sub amp are driving the subs, and you adjust the subs volume down to mate with the volume of the mains, and then the preamp volume control adjusts both volume levels in synch?"
bassdude-
the sub isn't being driven by the main amp. The impedance is preventing that. The signal is just high enough to be amplified by the subs amp.
The REL method is simple enough to try compared to the other suggestions.
bassdude-
the sub isn't being driven by the main amp. The impedance is preventing that. The signal is just high enough to be amplified by the subs amp.
The REL method is simple enough to try compared to the other suggestions.