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Old 10th April 2006, 10:03 AM   #1
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Default Passive Crossover for Passive Subwoofer?

Hey

Is it possible to design a passive crossover to a subwoofer that has a different orders in it...for example I want to make a passive crossover that has a 2nd order highpass @ 18hz and a 4th order low pass @ 80hz

I know its possible to make them the same for example a 2nd order bandpass at 18hz and 80hz?

If any more info in required just ask

any responce to this would be appreciated or even a referal as this is a complicated subject

Thanks
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Old 10th April 2006, 10:09 AM   #2
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It is possible, but the cost, size and weight of the huge inductors and caps required would be very large, possibly more than the cost of the rest of the driver and cabinet put together. It may seem complicated, but active is the way to go with subs.
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Old 10th April 2006, 10:39 AM   #3
sreten is offline sreten  United Kingdom
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Hi,

I'll second PM, the inductor for a 18Hz highpass will be extraordinarily expensive,
if you could even find one, the 80Hz components will also be expensive.

Active highpass (and lowpass) is the only sensible option.

There is no problem with 2nd order highpass and 4th order lowpass.

/sreten.
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Old 10th April 2006, 10:52 AM   #4
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as in active crossover or active subwoofer?
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Old 10th April 2006, 10:53 AM   #5
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I know how active crossovers work and that they are more efficent and make the amp more efficent which makes less distortion but i dont know how to make them.

Can any of you direct me to a book or site or even a store bought one that could me make them or buy them

thanks
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Old 10th April 2006, 10:55 AM   #6
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sorry for all the mis aligned posts due to me reading your answers before youve seen my "under moderation post"
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Old 11th April 2006, 05:37 AM   #7
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Well...? any info at all?
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Old 11th April 2006, 06:50 AM   #8
Khron is offline Khron  Romania
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http://sound.westhost.com/project09.htm

I'm in the process of building a couple of active crossovers as seen in the link above. If you're interested, i might even attach the schematic and PCB as i drew them up in Eagle 4.03.
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Old 11th April 2006, 12:40 PM   #9
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Could I pay possibly pay you to design and/or make one for me

(with my predetermined specs that ill tell you if you accept),

or could you direct me something that can

please!

nothing comes up on google anywhere that I can use

and I cant use yours cause there for speakers and 2/3 way ones..I want a 1 way bandpass if that possible

Thanks
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Old 11th April 2006, 12:47 PM   #10
rabbitz is offline rabbitz  Australia
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Have a look at Jaycar sub processor kit KA1814 or Altronics sub controller K5562 and should cover your needs.

A plate amp is still be easiest option but if you want to use an existing power amp, then use either of the above kits.
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