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Rijaak 14th May 2012 10:43 PM

seas woofers and vifa tweeters, attenuate tweeter?
So I'm thinking of using two Seas H1224-08 woofers with on vifa XT25C90-04 tweeter in this crossover: ImageShack® - Online Photo and Video Hosting I believe the crossover between the tweeter and the woofers is around 1000 hz, so that should work out well. My concern is that the sensitivity of the tweeter is at 91.7 db and the sensitivity of the woofers is 88 db. Is it necessary to attenuate the tweeter? How would I go about that?

Rijaak 14th May 2012 10:59 PM

These are the tweeters: Madisound Speaker Store

These are the woofers: Madisound Speaker Store

I already have the tweeters which I'm reusing from another project.

samadhi 14th May 2012 11:24 PM

What IS that crazy crossover schematic?

There are lots of designs using this tweeter on Troels Graveson's site, have a look there.

Rijaak 14th May 2012 11:32 PM

The crossover schematic is the crossover that ill be using.

Inductor 15th May 2012 12:24 AM

OH, nooo! The Bose 4001 crossover. Not again.
Rijaak, you need a 2-Way for this setup. You can ask Madisound to do a personalized crossover. At least get something working. Have a nice day.
Leap Crossover Designs by Madisound

PeteMcK 15th May 2012 01:44 AM

1000 Hz is too low to cross over that tweeter. Crossovers need to be design for the specific drivers being used.

attenuation:L pad calculator - attenuation dB damping impedance decibel loudspeaker speaker voltage divider - sengpielaudio Sengpiel Berlin

sreten 15th May 2012 11:17 AM


Its a long time time since I've come across such a stunningly bad plan.

That x/o is terrible. The drivers are OK but need to be used in a properly
designed speaker or otherwise they will sound far worse than their
capabilities, and I suspect such design skills are not available.

Is a good design and uses the H1224 properly.

It needs good design skills to build a proper 2.5 way using those drivers.
According to Zaph|Audio that tweeter is not ideally
suited to the low x/o point needed for the L18 driver.

rgds, sreten.

undefinition (see if nothing else, the excellent FAQs)
The Speaker Building Bible - Thread opened for edits/input. - Techtalk Speaker Building, Audio, Video, and Electronics Customer Discussion Forum From
Zaph|Audio - ZA5 Speaker Designs with ZA14W08 woofer and Vifa DQ25SC16-04 tweeter
FRD Consortium tools guide
Designing Crossovers with Software Only
RJB Audio Projects
Jay's DIY Loudspeaker Projects
Speaker Design Works
HTGuide Forum - A Guide to Completed Speaker Designs.
A Speaker project
DIY Loudspeaker Projects Troels Gravesen
Humble Homemade Hifi
Quarter Wavelength Loudspeaker Design
The Frugal-Horns Site -- High Performance, Low Cost DIY Horn Designs
Linkwitz Lab - Loudspeaker Design
Music and Design

Inductor 15th May 2012 11:43 AM

sreten, you just opened a can of worms. Certainly not with first order crossovers that OP is looking for.

Originally Posted by sreten (
... not ideally
suited to the low x/o point needed for the L18 driver.

Rijaak 15th May 2012 05:46 PM

Tmi. I dont have a degree in electrical engineering. Just a what my punch-card computer designing father taught me growing up. It might help if I mention that the enclosure Im thinking of is a 0.8 cu ft ported with polyfill and one tapered 3" port with 1.75" diameter.

sreten 15th May 2012 08:17 PM


Originally Posted by Inductor (
sreten, you just opened a can of worms.
Certainly not with first order crossovers that OP is looking for.


True. and the x/o is diaster area with the bass/mid driver too.

rgds, sreten.

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