passive crossower help needed

smokingmachine · 29th May 2007, 08:59 PM

hy!

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

bass:
http://www.bcspeakers.com/download/p...F/more/147.pdf

horn:
http://www.bcspeakers.com/download/p...F/more/151.pdf

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

Cal Weldon · 30th May 2007, 03:13 PM

Hi,

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.

sreten · 30th May 2007, 04:14 PM

Hi,

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 http://www.mhsoft.nl/SeriesNotchfilter.asp

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.

sreten.

29th May 2007, 08:59 PM	#1
smokingmachine diyAudio Member Join Date: Sep 2005	passive crossower help needed hy! here are the pa speakers i intend to use in pa boxes bass: http://www.bcspeakers.com/download/p...F/more/147.pdf horn: http://www.bcspeakers.com/download/p...F/more/151.pdf 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

30th May 2007, 03:13 PM	#2
Cal Weldon Speakerholic diyAudio Moderator Join Date: Jan 2004 Location: British Columbia	Hi, 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. __________________ Next stop: Margaritaville Some of Cal's stuff \| Cal Weldon Consulting

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30th May 2007, 04:14 PM	#3
sreten diyAudio Member Join Date: Nov 2003 Location: Brighton UK	Hi, 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 http://www.mhsoft.nl/SeriesNotchfilter.asp 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. sreten.

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