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Old 29th May 2007, 09:59 PM   #1
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Join Date: Sep 2005
Default passive crossower help needed


here are the pa speakers i intend to use in pa boxes



what would be the best crossower frequency?colud be just one crossower frequency?

and what other frequency network should i use?

attenuator for horn will be needed i think(-4 dB attenuation), but which others would be usefull?

remind that the bass will be 4 ohm, horn 8 ohm

the PA box will be bassreflex type

i need help on this project
this box will be connected to quasi`s n-mosfet amplifier with 450W rms at 4 ohm load
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Old 30th May 2007, 04:13 PM   #2
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Location: Near Vancouver

It seems the woofer is usually used up to 700Hz and the tweeter has a recommended minimum 1.5K 2nd order. So that means you have to cross the woofer over higher than you want. For PA use it might not be too bad. If you have the chance to bi-amp, that might work the best.
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Old 30th May 2007, 05:14 PM   #3
sreten is offline sreten  United Kingdom
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Join Date: Nov 2003
Location: Brighton UK

Seems to me you need an electrically assymetric crossover.

Fairly standard selection of crossover point for the tweeter, given
its impedance peak you should compensate this for high power
handling, see

The 12" you rolloff early, say with a single inductor such that the peak
is flattened and becomes the roll off / crossover point of the driver.

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