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Multi-Way Conventional loudspeakers with crossovers

Can this be done, crossover right on the limit?
Can this be done, crossover right on the limit?
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Old 17th November 2018, 12:14 AM   #1
dezbaz is offline dezbaz  Australia
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Default Can this be done, crossover right on the limit?

Hi Guys
I have found a Woofer that is 26Hz to 1500Hz
My tweeter is 1500 to 22K


Is this advisable to use a speakers extreme limits for the crossover?


Thank you
Regards Dez
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Old 17th November 2018, 12:56 AM   #2
Galu is offline Galu  Scotland
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The woofer will not suffer from being crossed over at 1500Hz.

It would be safer to cross over the tweeter at 3000Hz.

A separation in crossover frequencies of one octave as above is tolerable with shallow crossover filters.

For a more comprehensive answer, you would have to supply full details of your drivers.
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Old 17th November 2018, 04:22 AM   #3
dezbaz is offline dezbaz  Australia
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Thank you

The Woofer
Fusion EN-SW122 - 12" Subwoofer
Subwoofer Fusion EN-SW122 specifications.

The tweeter
https://au.element14.com/visaton/800...hms/dp/1683915

I have also a possible midrange / tweeter which may be a better option to the 8005

This one
Planet Audio 4" 225W 2 Way Car Speakers TRQ422
I found them after posting this thread, but I'm still curious about whether there needs to be an overlap as I asked first up

Cheers
Dez
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Old 17th November 2018, 07:43 AM   #4
AllenB is online now AllenB  Australia
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The woofer will be beaming at 1500Hz. This is probably the highest frequency that a 12" driver can be successfully crossed, and only if the tweeter is more directional. Of course there should be no harm in running it higher until you come up with a solution.
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Old 17th November 2018, 08:14 AM   #5
4real is offline 4real  Netherlands
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Tweeter FSU is 2k, so it is not really advisable to use it below that. Even then as stated before the 12” will be beaming at 1.5khz. And since it is a car audio subwoofer, it will probably not even go to that high very well. What are your requirements for a speaker? Probably some people can give you some good tips!
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Old 17th November 2018, 09:41 AM   #6
swann is offline swann  Germany
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The tweeter is an overpriced version of the Visaton SC5 which costs around 10! euros not 25... Its a small tweeter with an fs around 2800 hz, and will be most likely playable at 4000 hz...
So no real partner for your woofer.
There's a speaker kit with this tweeter if you're still interested in it, its called "cheap trick 295" and you can find it here:


Strassacker, Komponenten: Lautsprecher, Frequenzweichen, Bauelemente.


Greets Swany.


P.s.: dont trust ultimately the speaker manufactores or what the stats the sites are telling you, a woofer with an frequency range up to 1500 hz does not necessarily mean that is also audible till 1500 hz, it just means jeah it "can" produce soooome tone up to this (even higher) but still its not really useable.
Speaker building is on one hand mostly evaluating what drivers fits the most together in which kind of enclosure...:-D.
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Last edited by swann; 17th November 2018 at 09:48 AM. Reason: Forgot something :)
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Old 18th November 2018, 01:33 PM   #7
SaSi is offline SaSi  Greece
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Half a lifetime ago, in the 60s, there was a design by KEF used in various products, like the original Celeste, incorporating an early B139 woofer (racetrack version of a 12" woofer) and a T15 dome tweeter. They were crossed at 1kHz, probably because the T15 was cleverly made and had a low resonance frequency. But it's been a while since then and expectations are higher.

These days, a 12" woofer (regardless of make and model) would be considered too large to radiate at 1kHz. It's more sensible to use it up to about 300-500Hz, and use a 3-5" midrange between that and the tweeter.
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Old 18th November 2018, 01:37 PM   #8
chris661 is offline chris661  United Kingdom
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That's a 12" car sub.
I promise you the sound will be like mush well before 1.5kHz. They're fine for below a couple of hundred Hz, where the cone is still acting as a piston. Above that, the cone starts bending all over the place.

If I already had the 12" drivers, I'd be looking at a 3-4" full-range driver for a crossover in the 300Hz range.

Chris
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Old 18th November 2018, 10:41 PM   #9
dezbaz is offline dezbaz  Australia
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Thanks everyone
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