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In Reply to: RE: SET active versus passive biamplification posted by danlaudionut on July 05, 2011 at 02:59:02
I agree with you to keep it as simple as possible.
The passive filter I use now has only a cap (6dB)to the Altec HF-horn and a 12 dB LC filter to the Klipsch Belle woofer.
Volum to 10 o'clock is enough so I don't need the amplification an active filter can provide. An active filter is only a passive filter with amplification, isn't that the only difference. Am I wrong?
Follow Ups:
Iodemus
The difference is the load.
In an active filter, the load is a grid leak
resistor which is a constant LCR
(Inductance/Capacitance/Resistance) load never
changing at different frequencies or volumes.
In a passive filter, the load is a speaker with
various LCR ratings that change with volume and
with frequency as well as decreasing the
dampening factor with every componant.
The less you have between the amp and the speaker
the better the amp can control the speaker.
The better the amp controls the speaker, the clearer
the sound and the wider the frequency responce.
DanL
The filter is between the preamp and poweramps, only a cable is between the poweramps and the speakers..
Iodemus
When I say speakers I am referring
to the speaker drivers themselves.
The LP and HP filters also act to
decouple the drivers from the amp.
Tweeters aren't very hard to control
BUT the lower you go in frequency
the tougher it is to control the drivers
because of the diaphram excursion.
I could go on and on but ...
hearing is believing.
DanL
So you are talking about line level filters. Then the issue is the output impedance of the preamp and the input impedance of the amp and what effect they will have in interaction with the selected filter components. The active circuitry in an active crossover is not usually used for a gain increase but rather as a buffer that keeps the aforementioned interaction to a minimum.There is no simple answer as to which is better because each requires an implementation specifically for the given system. For example if the passive setup is not optimal in terms of impedance and the active setup is, the active setup may sound better even though it may add more coloration from the active circuitry.
Edits: 07/05/11
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