Crossover question

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Old Apr 8, 2006 | 02:21 AM
  #1  
Beefullo's Avatar
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From: Mesquite, TX
Crossover question

Not that my sub is installed I'd like to take the bass out of my speakers (let my sub do the work) and I am almost positive I can do that with some form of a crossover. How would I set this up and what all would I need?

I already have my gain set pretty high on my amp and the bass pretty low on my stock headunit so don't suggest that.
 
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Old Apr 8, 2006 | 02:43 AM
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Originally Posted by Beefullo
Not that my sub is installed I'd like to take the bass out of my speakers (let my sub do the work) and I am almost positive I can do that with some form of a crossover. How would I set this up and what all would I need?

I already have my gain set pretty high on my amp and the bass pretty low on my stock headunit so don't suggest that.
Just set your LPF on the HU at 80 hz.
 
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Old Apr 8, 2006 | 01:18 PM
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Since you are using the stock HU, you can use a couple of these:
http://www.partsexpress.com/pe/showd...number=266-152
And they will help prtect your speakers some on the low frequency or for an even cheaper alternative, you can just put some caps inline with the positive side, like this one:
http://www.partsexpress.com/pe/pshow...number=027-376

Your choice, Better or Cheaper.

Oh...and why do you have the gain set high on your amp? You need to set it up properly or you can be distorting your sub and can cause damage.
 
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Old Apr 8, 2006 | 01:22 PM
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Oops...didn't pay attention to the Stock HU.
 
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Old Apr 8, 2006 | 10:33 PM
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Yep, Id just wire a cap in series on each of the speakers + wire. It will act just like a 6 db/octave crossover. A 500 uF cap would give you a 80 hz xover point, IIRC.

Easiest and cheapest way to do it.
 
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Old Apr 9, 2006 | 02:04 AM
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From: Mesquite, TX
Originally Posted by Bartak1
Yep, Id just wire a cap in series on each of the speakers + wire. It will act just like a 6 db/octave crossover. A 500 uF cap would give you a 80 hz xover point, IIRC.

Easiest and cheapest way to do it.
Can you explain to me how to do this? I had my system installed so I'm not exactly system savvy. You're just sayind put a 500 uF capacitor (From Radioshack I presume?) in line with the positive wire to my speakers?
 
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Old Apr 9, 2006 | 08:15 AM
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Originally Posted by Beefullo
Can you explain to me how to do this? I had my system installed so I'm not exactly system savvy. You're just sayind put a 500 uF capacitor (From Radioshack I presume?) in line with the positive wire to my speakers?
Yes, that's what to do. Just get a cap suitable for using in crossovers that has axial leads. Surely the Radio Shack people can help. If not, get a cap that is polyester film that does NOT have positive and negative leads. Get one that is non-polar. 400uF will high pass around 100hz, and 500uF will high pass around 80hz. This is assuming 4 ohm speakers. Solder the caps inline on the positive speaker wire and you're good to go. To do a really nice looking job, get some shrink wrap big enough to cover the entire cap and lead wires. You don't want anything shorting out. Be sure to slip the shrink wrap on before soldering the cap in place.
 
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Old Apr 9, 2006 | 10:15 AM
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Originally Posted by Bartak1
A 500 uF cap would give you a 80 hz xover point, IIRC.
You are correct, I guess the site I used before gave me the wrong amount. On this site: http://www.the12volt.com/caraudio/crosscalc.asp
It comes out to right about 500uF for 80Hz. The 400uF would be more about 100Hz. But at 6db/Oct 100Hz might not be bad either.
 
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Old Apr 9, 2006 | 05:30 PM
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Originally Posted by Rider69
You are correct, I guess the site I used before gave me the wrong amount. On this site: http://www.the12volt.com/caraudio/crosscalc.asp
It comes out to right about 500uF for 80Hz. The 400uF would be more about 100Hz. But at 6db/Oct 100Hz might not be bad either.
Yeah, I couldnt remember if that was right or not. There are to many numbers to remeber, I usually have to look it up.

Your right though, with only a 6 db/ocvate slope, going up to a 100 Hz crossover might not be bad. Would filter out the low lows better, and Im sure a lot of people would be able to tell the difference from an 80 to a 100 Hz Xover point. Even if his sub amp is crossed over at 80Hz-with only 6db/octave, it should fill in that gap suitable enough for most people.
 
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