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Old 1st July 2008, 08:22 PM   #1
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Default Help building 3 way crossover

Hi all. First id like to say what a great community you all have here. Keep up the good work!!

Anyways... on to my problem.

I have a set of speakers that i use for DJing down beaches and out door parties that i would like to add a crossover to. The speakers are made up of a combination of 2 (its a long story).

They arent worth spending much money on so a cheap first order crossover is ideal.

The speakers cabinets each have 2 120watt 4ohm 8" drivers and a tweeter. The drivers are not the same. One sounds alot more bassier and aboutt 15% quieter than the other eventhough the impedence is the same. I assume the tweeters are piezo as they came with no capacitor attached and i have used them for years without troubles. Is there a way to tell if its a piezo or not?

Id like to add a crossover that: filtered only the bass to the bottom driver; filtered bass and mid to the top driver and reduce volume 15% if possible; filter treble to the tweeter(if its not a piezo).

I understand that there is an art to making crossovers and its hard to advise without knowning the speakers, but im just after a rough and ready crossover as that what the speakers are.

Any help would be great. I live in the UK, what is the best place to ge this stuff?

Cheers

Liam
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Old 1st July 2008, 08:27 PM   #2
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Are the speakers the same left and right, just different drivers in each cab?

Does the midrange driver share the same cabinet volume as the bass?

Are the cabs sealed or vented?
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Old 1st July 2008, 08:31 PM   #3
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Hi Liam,

Any pictures?

Piezos are very light as there is no magnet on them but require a different sort of crossover than dynamic tweeters. They are usually a plastic horn type. They can be used without any XO.

How were the two woofers wired? Hopefully in series as the 4 ohm load drops to 2 ohms if in parallel. It may be that one is a woofer and one is a wide range to cover the vocals. Although and XO is preferable, it may be that they sound OK by running them full range. You can't easily change the amount of sound coming from a woofer, you usually pad down the tweeter if it's too bright. Also, if they are in series then you can't pad down just one. If you want to separate the sound so only one woofer gets the bass, then you can run them in parallel and divert the lows and highs as you wish. That being said, we can't just give you some parts list without knowing the Thiel/Small parameters of the drivers and also the exact impedance at the intended XO point. You might be best off leaving them as is.

EDIT: typing while richie was.
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Old 2nd July 2008, 06:23 AM   #4
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Is there something about these speakers that you don't like? Tell us what you'd like to achieve.

There's just so much you could do...
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