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  #13  
Old 04-01-2010, 11:03 AM
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Re: Making Your own Passive Crossover.

What is a crossover? I'm a newb to this audio stuff. I used to just buy it and have it installed but now I'd like to try to install it myself.
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  #14  
Old 04-01-2010, 11:12 AM
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Re: Making Your own Passive Crossover.

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Originally Posted by B.P.O.D View Post
crossovers are really easy to make timmy!!! matt gave you some good reading, i've made crossovers for cars and home audio with my dad... you know how to solder so you're good to go
I think design is where he is lost (as I am).... but I'm learning/reading.

Construction is easy

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Originally Posted by White WK Swagga View Post
What is a crossover? I'm a newb to this audio stuff. I used to just buy it and have it installed but now I'd like to try to install it myself.
Simple explanation.

A crossover basically takes a full-range signal that your headunit pumps out and filters out the higher frequencies to be delivered to a tweeter, or smaller speaker and sends the lower frequencies to a mid woofer, or larger speaker.

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Old 04-01-2010, 11:16 AM
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Re: Making Your own Passive Crossover.

Ok so for the money you're saying I should install one also? or is that only for serious systems?
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  #16  
Old 04-01-2010, 11:24 AM
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Re: Making Your own Passive Crossover.

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Originally Posted by White WK Swagga View Post
Ok so for the money you're saying I should install one also? or is that only for serious systems?
It totally depends on what kind of speakers you're going to be using.

For a sub... the amp should have a crossover built-in.

For coaxials... they have built-in inline crossovers.

For components... they come with passive crossovers

For... raw drivers (like what I used), I have active crossovers in my processor.

Building your own passives is really meant for home use.


In a car you can usually match up raw drivers with a set of passives from a component set and be just fine.
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Old 04-01-2010, 11:25 AM
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Re: Making Your own Passive Crossover.

matt/timmy if you guys want crossover designs let me know what specs you need and i will try to get the diagrams to you... crossovers are easy to assemble. just getting the right parts can be tricky.. also they can get large
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  #18  
Old 04-01-2010, 11:27 AM
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Re: Making Your own Passive Crossover.

*&^@*%@#@&*(@!*@$)(*&^)$&@^)!@&*)


^^^ That's what I understood out of what you just said. LOL But I think I understand what you're saying.....
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  #19  
Old 04-01-2010, 12:07 PM
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Re: Making Your own Passive Crossover.

Quote:
Originally Posted by B.P.O.D View Post
matt/timmy if you guys want crossover designs let me know what specs you need and i will try to get the diagrams to you... crossovers are easy to assemble. just getting the right parts can be tricky.. also they can get large
Yeah, I think I'm going to pick up a loudspeaker cookbook. Learn the basics/fundamentals. I'd like to get to the point I am now with car audio and be able to recognize what drivers do well when paired together, interpreting t/s parameters and how they correspond with in-home acoustics, etc, etc.

I definitely need to figure what I can and can't do with my receiver. Filters, EQ, time alignment, etc.


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Originally Posted by White WK Swagga View Post
*&^@*%@#@&*(@!*@$)(*&^)$&@^)!@&*)


^^^ That's what I understood out of what you just said. LOL But I think I understand what you're saying.....

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  #20  
Old 04-02-2010, 05:21 PM
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Re: Making Your own Passive Crossover.

Great info above. Basically I look at my JL XR crossovers and know I can def make an exact copy of them if one ever failed on me because all the components are labeled. But I want to try out drivers im seeing on partsexpress, tweeter and 6.5 mids, to put a nice little system in my friends VW. What is an "L-Pad"? The reason I ask is I just read this in an article on building a speaker "Incorporating an L-Pad into the tweeter design reduces the output by approximately 6db, aligning it with that of the Tang Band woofer". Im also wondering like i brought up before, just getting a decent midwoofer and then a tweeter with a cap soldered inline with it, would that work? Because thats how my JL TR's are right now, there is no crossover per say, just a woofer, and tweeter with a cap in believe on the positive lead.

But now im wondering why when I look up the JL XR tweeters being sold just by themselves they are spec'd at 8ohm's. I wonder if the resistors in the crossovers bring it down to 4 ohms like the complete system is spec'd at.
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  #21  
Old 04-02-2010, 09:20 PM
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Re: Making Your own Passive Crossover.

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Originally Posted by TimmyB View Post
But I want to try out drivers im seeing on partsexpress, tweeter and 6.5 mids, to put a nice little system in my friends VW.
Dude, go active if you want to try out raw drivers... NO-ONE does that passively. No one.

Or buy a packaged component set.

Search Amazon.com for PG RSd65cs or 60cs - that set will blow away those JL's you have at a fraction of the cost

Quote:
Originally Posted by TimmyB View Post
What is an "L-Pad"? The reason I ask is I just read this in an article on building a speaker "Incorporating an L-Pad into the tweeter design reduces the output by approximately 6db, aligning it with that of the Tang Band woofer".
http://en.wikipedia.org/wiki/L_pad

http://www.bcae1.com/lpad.htm

Looks to be an inline level control for passive systems.

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Originally Posted by TimmyB View Post
Im also wondering like i brought up before, just getting a decent midwoofer and then a tweeter with a cap soldered inline with it, would that work? Because thats how my JL TR's are right now, there is no crossover per say, just a woofer, and tweeter with a cap in believe on the positive lead.
Wouldn't then your mid woofer be sent a full range signal?

You'll have gobs of frequency overlap. In a stereo configuration you want like frequencies being reproduced from two drivers; one on the left and one on the right (left mid, right mid), or (left tweeter, right tweeter) - not (left mid, left tweeter, right mid, right tweeter).

Quote:
Originally Posted by TimmyB View Post
But now im wondering why when I look up the JL XR tweeters being sold just by themselves they are spec'd at 8ohm's. I wonder if the resistors in the crossovers bring it down to 4 ohms like the complete system is spec'd at.
Likely. Crossover components + multiple drivers can change the final impedance that the amplifier sees.
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Old 04-03-2010, 03:56 PM
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Re: Making Your own Passive Crossover.

Nope, the TR set I have only have a 6.5 woofer, a tweeter, and came with speaker wires for the tweeters that have what looks like a cap soldered onto the positive line. So the woofer is in the door, the leads on the woofers have 2 connectors on them, one for the speaker wires coming from the amp, then one going to the tweet. There is nothing but speaker wire between the woofer and amp.

I dont want to go active in her car, I want to buy raw drivers and find out how to make a simple crossovers for them. Im doing this because I want to upgrade her gear since she has dont alot for me, and I want to learn entry level speaker building. Im about to take apart my home tower speakers that I never use and use some of the components in there. Im not looking to make a competion system, just something better than her stock speakers. I have a nice older model precision power 100x2 amp for her fronts and an MTX amp for subs. I'll just keep the rear stock speakers in prob.
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Old 04-04-2010, 07:30 AM
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Re: Making Your own Passive Crossover.

Quote:
Originally Posted by TimmyB View Post
Nope, the TR set I have only have a 6.5 woofer, a tweeter, and came with speaker wires for the tweeters that have what looks like a cap soldered onto the positive line. So the woofer is in the door, the leads on the woofers have 2 connectors on them, one for the speaker wires coming from the amp, then one going to the tweet. There is nothing but speaker wire between the woofer and amp.
Right, so the amps is sending a full-range signal to your woofer, then the woofer is sending that same signal to your tweeter, but the inline cap on your wiring removes the lower frequencies.

Quote:
Originally Posted by TimmyB View Post
I dont want to go active in her car, I want to buy raw drivers and find out how to make a simple crossovers for them. Im doing this because I want to upgrade her gear since she has dont alot for me, and I want to learn entry level speaker building. Im about to take apart my home tower speakers that I never use and use some of the components in there. Im not looking to make a competion system, just something better than her stock speakers. I have a nice older model precision power 100x2 amp for her fronts and an MTX amp for subs. I'll just keep the rear stock speakers in prob.
Yeah, but you really can't just start throwing random crossovers with random drivers. The passive crossover needs to be designed to work with the drivers you're using.

I'd use a passive crossover from a car audio component set before I used one from a home audio tower set.
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Old 04-05-2010, 06:52 PM
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Re: Making Your own Passive Crossover.

Quote:
Originally Posted by Matt View Post
Right, so the amps is sending a full-range signal to your woofer, then the woofer is sending that same signal to your tweeter, but the inline cap on your wiring removes the lower frequencies.

That is what it seems, odd to me but I guess it works???



Yeah, but you really can't just start throwing random crossovers with random drivers. The passive crossover needs to be designed to work with the drivers you're using.

Thats what I want to learn, how to make a crossover for the speakers I am eyeing on PE.

I'd use a passive crossover from a car audio component set before I used one from a home audio tower set.
I do have two extra JL XR crossovers and the tweeters I bought in a set where I only needed the woofer. I can use those, but then I would have to pick out raw drivers that would work with them. Any ideas? Keep in mind I want to do this sytem cheap, thats why I want to buy raw drivers and do everything myself. Partsexpress has Dayton SDS 6.5's for 10 bucks each on sale that has good reviews. Thats what im looking to do, nothing fancy or expensive and using all the spare wires and amps I have. Im about to just rip out my TR's from the rear doors and give them to her. I want to do something nice for her, but I have limited money to do it.
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