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#1
Posted to rec.audio.car
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understanding crossover capacitors
hi all,
how can i tell which cap cuts off a certain frequency? is there a table that has the specific frequencies/cap ? 1.0 µF 1.5 µF 2.2 µF 3.3 µF 4.7 µF 6.8 µF 8.2 µF 10.0 µF 15.0 µF 22.0 µF 33.0 µF 47.0 µF 68.0 µF |
#2
Posted to rec.audio.car
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understanding crossover capacitors
It depends on the impedence of the speaker. Here's some useful links: http://www.carstereo.com/help/cust_cr.cfm http://www.carstereo.com/help/calc_cr.cfm -- black300zx |
#3
Posted to rec.audio.car
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understanding crossover capacitors
"Antispammer" wrote in message ... hi all, how can i tell which cap cuts off a certain frequency? is there a table that has the specific frequencies/cap ? 1.0 µF 1.5 µF 2.2 µF 3.3 µF 4.7 µF 6.8 µF 8.2 µF 10.0 µF 15.0 µF 22.0 µF 33.0 µF 47.0 µF 68.0 µF Try here http://www.carstereo.com/help/Articles.cfm?id=1 |
#4
Posted to rec.audio.car
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understanding crossover capacitors
In article , "e-nigma" wrote:
"Antispammer" wrote in message ... hi all, how can i tell which cap cuts off a certain frequency? is there a table that has the specific frequencies/cap ? 1.0 µF 1.5 µF 2.2 µF 3.3 µF 4.7 µF 6.8 µF 8.2 µF 10.0 µF 15.0 µF 22.0 µF 33.0 µF 47.0 µF 68.0 µF Try here http://www.carstereo.com/help/Articles.cfm?id=1 Thats a good chart. Remember this is only a guide. The actual impedance of a driver at your desired crossover frequency will usually vary, and some very much. So the actual crossover frequency may be something else. Electronic crossovers are immune to this situation, allthough the drivers amplitude and phase still must be considered. greg |
#5
Posted to rec.audio.car
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understanding crossover capacitors
Try here
http://www.carstereo.com/help/Articles.cfm?id=1 Nice link! I'm bookmarking that sucker! Thanks! MOSFET |
#6
Posted to rec.audio.car
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understanding crossover capacitors
wow....thats what i am looking for...
thanks man!!!!! one more question though.. so i should get a 9.94uf(2000hz) or a 16.56(1200hz) cap for my 8ohm tweeters? the specs of my tweeters; nominal power handling crossover at 2200hz = 220w/12db, 120w/6db frequency response = 1400-22000hz (limit 300-50000hz) |
#7
Posted to rec.audio.car
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understanding crossover capacitors
Go for about 4000 to 5000 hz at a 12db slope. If you are only using one cap
(6db slope) without a coil go even higher. It is not so much about the power handling as it is about matching it to your midrange. And 1200 to 200 hz is normally way too low to croos over a tweeter at. And unless you want to get into fabricating impedance neutral attentuation circuits (aka Lpads) then you will have a problem matching an a first order (6db) filtered tweeter to your midrange. In my opinion, you would be much better off just buying one of the commercially available passive crossover networks that are common on Ebay. These have tweeter attenuation circuits and can be picked up for about the same money as you would spend on two good polypropelene caps. - RG "Antispammer" wrote in message ... wow....thats what i am looking for... thanks man!!!!! one more question though.. so i should get a 9.94uf(2000hz) or a 16.56(1200hz) cap for my 8ohm tweeters? the specs of my tweeters; nominal power handling crossover at 2200hz = 220w/12db, 120w/6db frequency response = 1400-22000hz (limit 300-50000hz) |
#8
Posted to rec.audio.car
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understanding crossover capacitors
alright! thanks.
will do just that. thanks a million! "RG" wrote in message ... Go for about 4000 to 5000 hz at a 12db slope. If you are only using one cap (6db slope) without a coil go even higher. It is not so much about the power handling as it is about matching it to your midrange. And 1200 to 200 hz is normally way too low to croos over a tweeter at. And unless you want to get into fabricating impedance neutral attentuation circuits (aka Lpads) then you will have a problem matching an a first order (6db) filtered tweeter to your midrange. In my opinion, you would be much better off just buying one of the commercially available passive crossover networks that are common on Ebay. These have tweeter attenuation circuits and can be picked up for about the same money as you would spend on two good polypropelene caps. - RG "Antispammer" wrote in message ... wow....thats what i am looking for... thanks man!!!!! one more question though.. so i should get a 9.94uf(2000hz) or a 16.56(1200hz) cap for my 8ohm tweeters? the specs of my tweeters; nominal power handling crossover at 2200hz = 220w/12db, 120w/6db frequency response = 1400-22000hz (limit 300-50000hz) |
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