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Old 16th November 2008, 09:51 PM   #1
Telstar is offline Telstar  Italy
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Default low-pass crossover suggestions

I'm looking to build (or better, have built) a low-pass crossover cut at around 80hz. I would like some advice on how to make it.
Thanks.
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Old 16th November 2008, 10:38 PM   #2
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You will loose a lot of power, and that thing will be massive like one bass driver, try other way , active.
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Old 16th November 2008, 10:59 PM   #3
Telstar is offline Telstar  Italy
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Quote:
Originally posted by zoranaudio
You will loose a lot of power, and that thing will be massive like one bass driver, try other way , active.
I'm asking which alternatives I have to NOT go active.
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Old 16th November 2008, 11:50 PM   #4
tinitus is offline tinitus  Europe
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Bandpass cabinet...acoustic lowpass filter
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Old 17th November 2008, 01:04 AM   #5
Borus is offline Borus  United States
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Lightbulb other way

You might look into a higher Hz cross over point and then control the output from the woofer with the Enclosure. I mean maybe 180hz with the passive components to save power and complexity in the crossover but make a box that can absorb the next 100hz your looking for. You can find info on this concept at the auto-sound web sites.

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Old 17th November 2008, 02:36 AM   #6
peter_m is offline peter_m  Canada
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An option to go active: http://www.htguide.com/forum/showthr...tive+crossover

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Old 17th November 2008, 03:37 AM   #7
BHTX is offline BHTX  United States
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Good link Peter. Several options discussed there.
And those "cheap" Behringer units do work well, especially for what they cost!
To most people, it's probably worth the price just for using the first variable lowpass crossover to use for subwoofer(s).
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Old 17th November 2008, 10:45 AM   #8
Telstar is offline Telstar  Italy
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Default Re: other way

Quote:
Originally posted by tinitus
Bandpass cabinet...acoustic lowpass filter

Quote:
Originally posted by Borus
You might look into a higher Hz cross over point and then control the output from the woofer with the Enclosure. I mean maybe 180hz with the passive components to save power and complexity in the crossover but make a box that can absorb the next 100hz your looking for. You can find info on this concept at the auto-sound web sites.
I forgot to say that the speakers will be entirely Open Baffle, so I cannot and dont want to play with cabinet resonance. I will be using 2x 15" Hawrhorne Augies (or 4x 10") for 30-80/90/100 range.
I'm definitely NOT going above 100hz.

So, how big would such crossover be?
The budget would be <500 for each.

I found this site:
http://www.apicsllc.com/apics/Misc/filter2.html

BTW, if someone can point me to some writeup of different types of crossover filters, I would be glad.
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Old 17th November 2008, 11:40 AM   #9
sreten is offline sreten  United Kingdom
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Hi,

Read up MJK's open baffle articles here : http://quarter-wave.com/

/sreten.
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Old 17th November 2008, 02:13 PM   #10
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For the price of the passive components, you could buy a plate amp.
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