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2) You can use it with a low wattage integrated or tube amplifier in a
"biamplied" system
There are a number of popular tube integrated amplifiers on the market, the so-
called "Flea Watt"amplifiers which don't have much juice, but offer a warm "tubey"
sound which is much prized. These amplifiers are good candidates for operation
with an F4 in a setup where the loudspeakers have two separate sets of input
terminals, one for the woofer and one for the midrange/tweeter.
In such a system the F4 is used to drive the bottom end, where it offers superior
damping and higher current, and the flea watt amplifier drives the mid and top
end, unburdened by the effort of driving the woofer but preserving the character of
the tube amp.
It is particularly convenient that the F4 is close to unity gain, which provides close
level matching between the bottom and top. (In the diagram below, it is assumed
that crossover networks are incorporated into the woofer and mid/high end
speakers)
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