Philthy
That dent guy
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- 3.0R Liberty, XC Falcon
I'm gunna post this in the car audio section, even though it isn't related to cars exactly.
The deal is, that a mate of mine has an old (~10 years) no-name pro-audio 12" sub lying around, and I have a decent PA setup that I use for parties etc.
Now, I want to build this sub a box, and use it with my PA gear for a bit of extra low-end kick, but I will need a low pass filter/crossover for it, as the amp I'll be running it off doesn't have one. Now, since this is only really for a bit of fun and I don't expect it to last that long I'd like to have a go at building a crossover from scratch, as opposed to forking out ~$80 like they all seem to cost.
A bit of googling tells me they aren't that complicated but I'm having a bit of trouble finding a suitable schematic to copy. I was thinking of either 80 or 100hz as the cutoff frequency, and it will have to be an active design, able to cope with up to 500wrms, but usually only 250wrms.
I found a table that says what capacitor and inductor I want, which I will be able to get from Jaycar
Frequency 2 ohms 4 ohms 8 ohms
(Hertz) L C L C L C
80 5.6 mH 700 µF 11 mH 330 µF 22 mH 180 µF
100 4.5 mH 550 µF 9.1 mH 270 µF 18 mH 150 µF
http://ccs.exl.info/cust_cr.html
The problem is that there are so many designs that I don't know which one is the best!
http://www.discovercircuits.com/PDF-FILES/LowPassFilt1.pdf (a few designs)
Does anyone on here know anything about this sort of thing? Just a simple schematic should be all I need to figure it all out
The deal is, that a mate of mine has an old (~10 years) no-name pro-audio 12" sub lying around, and I have a decent PA setup that I use for parties etc.
Now, I want to build this sub a box, and use it with my PA gear for a bit of extra low-end kick, but I will need a low pass filter/crossover for it, as the amp I'll be running it off doesn't have one. Now, since this is only really for a bit of fun and I don't expect it to last that long I'd like to have a go at building a crossover from scratch, as opposed to forking out ~$80 like they all seem to cost.
A bit of googling tells me they aren't that complicated but I'm having a bit of trouble finding a suitable schematic to copy. I was thinking of either 80 or 100hz as the cutoff frequency, and it will have to be an active design, able to cope with up to 500wrms, but usually only 250wrms.
I found a table that says what capacitor and inductor I want, which I will be able to get from Jaycar
Frequency 2 ohms 4 ohms 8 ohms
(Hertz) L C L C L C
80 5.6 mH 700 µF 11 mH 330 µF 22 mH 180 µF
100 4.5 mH 550 µF 9.1 mH 270 µF 18 mH 150 µF
http://ccs.exl.info/cust_cr.html
The problem is that there are so many designs that I don't know which one is the best!
http://www.discovercircuits.com/PDF-FILES/LowPassFilt1.pdf (a few designs)
Does anyone on here know anything about this sort of thing? Just a simple schematic should be all I need to figure it all out
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