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Multi-Way Conventional loudspeakers with crossovers

Crazy crossover possible?
Crazy crossover possible?
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Old 13th February 2020, 04:36 PM   #1
ntell411 is offline ntell411
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Question Crazy crossover possible?

Hi, I'm new to this crossover stuff but trying my best to understand how to do this: I want to use one 8 ohm 18 inch woofer with an inductor at 100hz as a low pass and then use another identical 18 inch 8 ohm woofer with an inductor at 200hz and combine it with one 8 ohm full ranger with no caps or inductors. Will this work and will the amplifier see an 8 ohm load?
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Old 13th February 2020, 05:28 PM   #2
Galu is offline Galu  Scotland
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200Hz is very close to 100Hz, so I would just wire the two 18" units in parallel with a single inductor in series with the combination to provide a low pass filter at your desired frequency, say 200Hz or even a bit higher. This combination will give an amplifier load of 4 ohm over the frequency range where most of the signal power is being delivered by the amplifier.

A capacitor should be placed in series with your 8" full range speaker to provide a high pass filter at the same turnover frequency as the 18" drivers.

Whether this works effectively will depend on the relative sensitivities of your drivers, so you would have to supply information about them. If you follow the above suggestion then ensure your amplifier is happy to work into a low 4 ohm load.
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Old 13th February 2020, 05:40 PM   #3
turboyam is offline turboyam  Canada
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Why TWO 18 inchers??!
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Old 13th February 2020, 05:56 PM   #4
Galu is offline Galu  Scotland
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OP might be into reggae music!
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Old 13th February 2020, 06:48 PM   #5
nigelwright7557 is offline nigelwright7557  United Kingdom
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I never bother with crossovers on sub woofers.
They cant reproduce higher frequencies much anyway.
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Old 13th February 2020, 08:12 PM   #6
FE3T is offline FE3T  Norway
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Quote:
Originally Posted by nigelwright7557 View Post
I never bother with crossovers on sub woofers.
They cant reproduce higher frequencies much anyway.
I guess you are not familiar with the JBL 2203H, 2235H, and 2245H then

JBL used them in Subwoofers and as woofers in 4 way systems.

I myself run a 2245H as a subwoofer with a minidsp unit as crossover,
and with the hp filter bypassed it reproduces tunes well over 1khz before rolling off.
But this aint no 500grams mms slouch with tons of self inductance.
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Old 13th February 2020, 08:33 PM   #7
PeteMcK is offline PeteMcK
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RE:'will the amplifier see an 8 ohm load? " - if you're wiring the speakers in parallel, no
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Old 13th February 2020, 09:06 PM   #8
Galu is offline Galu  Scotland
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Thanks for that reinforcement Pete.

P.S. I'm beginning to think it should be 'mairr penetrration'. I just love rolling my 'r's!
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Old 13th February 2020, 09:07 PM   #9
system7 is offline system7  United Kingdom
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For a person who knows nothing, you sure are certain where you want to go on this.

They say "Fools rush in where Angels fear to tread!"

2X 18" speakers will be seriously loud. I don't know where you find a mid that can keep up with this.

Anyway, this is PA territory, and a host of other problems.

You can use biggish basses with a few other drivers, but Mr. Troels Gravesen has been careful to series wire the 12" basses to keep loudness within limits:

DTQWT-mkII

Might be doable at some level with electronic filters. But, I dunno!
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Old 13th February 2020, 09:10 PM   #10
Galu is offline Galu  Scotland
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Yeah Steve, series wiring of the woofers may be more desirable. However everyone, including the OP, is simply fumbling in the dark!
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