Biamping with a "limited" crossover between the pre and power amps is a possibility.

By "limited" I mean just using a capacitor and resistor configured as a low or high pass filter at the input of the power amps and still using the passive crossover between the amp and the drivers.

For instance, lets say that the woofer crosses over at 500Hz to the midrange.

For the woofer amp, select a value of R and C to effect a lowpass to the input of the woofer amp at a couple (or three) octaves above 500Hz.

For the high range driver(s), select a value of R and C to effect a highpass to the input of the highrange amp a couple (or three) octaves below 500Hz.

The passive crossover between the amps and the drivers will still be the determining factor in regards to the spectra received by the drivers. The passive crossover at the amp's inputs will provide some out of band frequency limiting to the amps.

Depending on the power amp's input topologies, the high pass amp may need to have only a capacitor placed in series with the input. The low frequency amps may already have a capacitor, placed after a series resistor, to limit the ultrasonic response of the amp. Increasing the value of this capacitor to a suitably large value will then provide the low pass function for the low frequency driver amp.

This setup is a viable and more affordable alternative to having an active crossover between the pre and the power amps.

Paul

------------------
the 1derful1