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Old 14th April 2016, 01:39 PM   #1
nzlowie is offline nzlowie  Australia
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Default Passive input filters

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......


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Old 14th April 2016, 10:57 PM   #2
djk is offline djk
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Should work fine, as long as driven from a low source impedance.

(no passive volume controls, or preamps like the Marantz Model 7 with its control on the output side)
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Old 14th April 2016, 11:30 PM   #3
rayma is offline rayma  United States
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Originally Posted by nzlowie View Post
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.

Last edited by rayma; 14th April 2016 at 11:33 PM.
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