I've often questioned if power is really all that important for BK LFEs (relative to subs) anyway. I say this because my father and I have the same exact BK amp, purchased at the same time about 10 years ago. The difference is that mine is powering two LFEs where his is driving 3. If you read the wiring info on the BK amp, it shows that running 1 or 2 LFEs provides each with up to 1000W of power, and if you run 3 off of the amp you are only giving them up to 110W of power and it's NOT recommended. Finally, with 4 LFEs, the literature states 250W per LFE.
Anyway, with two LFEs hooked up to my amp I never ran the gain dial at past say 11:00. This is with my sub on the receiver set to 0 in terms of gain. When watching bass-heavy content at reference level I find this is the point where my LFEs are giving all they can. If I turn the gain up to 12:00, the LFEs start to slap and are being over driven.
Now, with my fathers setup he's got his gain on his BK amp at about 1:00, but with 3 LFEs wired to the single amp is still able to make them tap out when according to the amp specifications they aren't receiving over 110W. I've never been able to figure this one out. Having listened to and felt both of our systems a million times, he nor I can feel any difference at all in terms of LFE performance when in theory mine are capable of receiving 9X the power.
Anyway, I tell this story as I'm not really sure that it matters all too much how much power LFEs are given, for whatever reason based on my illustration above. Any thoughts on why this is the case?