Passive input filters

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Hi all
In the process of building an active horn speaker setup. I have the 3 amps needed and was thinking about using simple passive filters on the input of each amp, are there any reasons not to try this?
I want the bass to roll off at say 400 hz with a first order slope so a simple resistor and capacitor filter on the amp input could do this, correct?

What do you think......

Thanks

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I have the 3 amps needed and was thinking about using simple passive filters
on the input of each amp. I want the bass to roll off at say 400 hz with a first order slope.

This can work well if the drivers' bandwidths extend well beyond the crossover points.
Be sure to take into account: differing driver efficiencies; differing amplifier gains;
preamp source impedance; amplifiers' input impedances. All these will affect the results.
The drivers should also be time aligned.
 
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