Rhyno, I assume you;re referring to a passive line level low-pass? If so, 1st order Butterworth is C= 1/2pi(F)(Ramp)(1+a). F= xover frequency, Ramp is the amp's impedance, a is the relation between amps' gain.
I.e. if a=1, the amps to be used have identical gain. If not, give a the appropriate value to balance the gain. For a much better take on this, check out Art Ludwig's site (sorry don't have it handy).
I.e. if a=1, the amps to be used have identical gain. If not, give a the appropriate value to balance the gain. For a much better take on this, check out Art Ludwig's site (sorry don't have it handy).