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Old 3rd July 2003, 06:01 AM   #1
moi is offline moi  Reunion
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Question passive filter for sub

hi folks

i'm looking for a sub passive filter 20-200hz

can someone help me?

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Old 3rd July 2003, 06:14 AM   #2
navin is offline navin  India
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passive XO at low freqs are expensive read as big inductors. if you are using 2 amps one for the suyb you cam use a Passive line level XO which willbe cheaper. crutchfield.com even sells such XOs.
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Old 3rd July 2003, 12:59 PM   #3
moi is offline moi  Reunion
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thanks
do you mean it's cheaper to build an active filter??

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Old 3rd July 2003, 02:53 PM   #4
AndersP is offline AndersP  Sweden
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Lightbulb Simplest solution

is to buy yourself a plate amp of the kind that are customized for subwoofer use. They often come with equalizers as well.

Im under the impression that a plate amp will save you both blood, sweat and tears and make you happy with the end result.
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Old 3rd July 2003, 03:07 PM   #5
Ken L is offline Ken L  United States
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Default Passive Line level crossovers are available

the XM46 by Marchand is a passive line level crossover for specified frequencies.

http://www.marchandelec.com/xm46.htm

This looks like pretty good value. There will be some insertion loss which should not be a problem if your preamp has enough gain.

Looks good enough to me that I am very close to purchasing several.

Most Plate amp crossovers wil not go as high as 200hz crossover point, plus the plate amp itself usually rolls off at a pretty steep rate - this might be good or bad depending on what you are trying to achieve -

HTH

Ken L
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Old 3rd July 2003, 09:13 PM   #6
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A pretty inexpensive solution seems to be available here. This website is run by Planet 10, the moderator on this forum:
http://www.t-linespeakers.org/tech/f...ssiveHLxo.html

These are useful if you have an amp just to run the subwoofer. They are placed before the subwoofer amp. I haven't tried one, but if this is the way you want to go, try listing the values that you plan to use and the electronics mavens on the board will be glad to check them out for you.

Do you have an extra amp or reciever just to drive the subwoofer, or are you trying to run subwoofer, woofer, mid, (if any) and tweeter off one single stereo amp?

If you don't have an extra amp, then as recommended earlier, these sub amps/crossovers definitely seem to be the way to go. the amounts of money you would have to lay out to buy passive components would cost more-why pay more for passive when active crossovers are so much better?

Here are some examples. Note the prices are reasonable:
http://www.partsexpress.com/webpage....7&WebPage_ID=3

www.madisound.com Click "catalog" on right, then "Keiga subwoofer amps".

www.bkelec.com Click "Modules and Hybrids".

As to what is cheaper to Reunion Island, I cannot say. Perhaps a quick look at some French speaker mail order houses?
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Old 4th July 2003, 05:56 AM   #7
navin is offline navin  India
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dave usually has a cheap and simple ideas. passsive line XOs are simple. dont get to peturbed about that. question is do you have a spare power amp?
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Old 4th July 2003, 06:07 AM   #8
moi is offline moi  Reunion
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what do you call a spare power amp

thanx to you all

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Old 4th July 2003, 06:19 AM   #9
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Here are some cheap practical solutions from the folks over at Parts Express

Inline Passive Crossover @ 100Hz Low Pass and 80Hz Low Pass. Both come in 4 and 8 Ohm versions @ 12dB per octave roll off. ~$16 ea.

Line Level Passive Crossovers @ 100Hz Low Pass and @ 70Hz Low Pass. These are 12dB per octave roll off, but you get two for ~$26...so if your feeding the sub off of one amplifier channel (LFE output) you can daisy chain them and get 24dB roll off.

If your just integrating these with your mains the first ones would be more practical....the 80Hz low pass would make them just fill in the bass demand and not interfere with the midrange as much.
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Old 4th July 2003, 06:24 AM   #10
navin is offline navin  India
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you will need to power amps is you are using any line level XO.
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