seas woofers and vifa tweeters, attenuate tweeter? - diyAudio
Go Back   Home > Forums > Loudspeakers > Multi-Way

Multi-Way Conventional loudspeakers with crossovers

Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Reply
 
Thread Tools Search this Thread
Old 14th May 2012, 10:43 PM   #1
Rijaak is offline Rijaak  United States
diyAudio Member
 
Join Date: Apr 2012
Default 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?
  Reply With Quote
Old 14th May 2012, 10:59 PM   #2
Rijaak is offline Rijaak  United States
diyAudio Member
 
Join Date: Apr 2012
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.
  Reply With Quote
Old 14th May 2012, 11:24 PM   #3
diyAudio Member
 
Join Date: Apr 2012
Location: Sydney
What IS that crazy crossover schematic?

There are lots of designs using this tweeter on Troels Graveson's site, have a look there.
  Reply With Quote
Old 14th May 2012, 11:32 PM   #4
Rijaak is offline Rijaak  United States
diyAudio Member
 
Join Date: Apr 2012
The crossover schematic is the crossover that ill be using.
  Reply With Quote
Old 15th May 2012, 12:24 AM   #5
diyAudio Member
 
Inductor's Avatar
 
Join Date: Feb 2006
Location: Cascais
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
  Reply With Quote
Old 15th May 2012, 01:44 AM   #6
diyAudio Member
 
Join Date: Feb 2002
Location: Western Sydney
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
__________________
Impedance varies with frequency, use impedance plots of your drivers and make crossover calculations using the actual impedance of the driver at the crossover frequency
  Reply With Quote
Old 15th May 2012, 11:17 AM   #7
sreten is offline sreten  United Kingdom
diyAudio Member
 
Join Date: Nov 2003
Location: Brighton UK
Hmmm.....

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.

Zaph|Audio
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 Parts-Express.com
Zaph|Audio
Zaph|Audio - ZA5 Speaker Designs with ZA14W08 woofer and Vifa DQ25SC16-04 tweeter
http://audio.claub.net/Simple%20Loud...ign%20ver2.pdf
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 HTguide.com 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
__________________
There is nothing so practical as a really good theory - Ludwig Boltzmann
When your only tool is a hammer, every problem looks like a nail - Abraham Maslow
  Reply With Quote
Old 15th May 2012, 11:43 AM   #8
diyAudio Member
 
Inductor's Avatar
 
Join Date: Feb 2006
Location: Cascais
sreten, you just opened a can of worms. Certainly not with first order crossovers that OP is looking for.
Quote:
Originally Posted by sreten View Post
... not ideally
suited to the low x/o point needed for the L18 driver.
  Reply With Quote
Old 15th May 2012, 05:46 PM   #9
Rijaak is offline Rijaak  United States
diyAudio Member
 
Join Date: Apr 2012
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.
  Reply With Quote
Old 15th May 2012, 08:17 PM   #10
sreten is offline sreten  United Kingdom
diyAudio Member
 
Join Date: Nov 2003
Location: Brighton UK
Quote:
Originally Posted by Inductor View Post
sreten, you just opened a can of worms.
Certainly not with first order crossovers that OP is looking for.
Hi,

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

rgds, sreten.
__________________
There is nothing so practical as a really good theory - Ludwig Boltzmann
When your only tool is a hammer, every problem looks like a nail - Abraham Maslow
  Reply With Quote

Reply


Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
FS: Vifa D25 Tweeters And P13 Mid/Woofers Illusus Swap Meet 2 16th February 2012 04:26 PM
Woofers, tweeters Vifa, PSB Peerless FS feke67 Swap Meet 0 10th May 2008 04:34 PM
FS: Complete speakers without cabinets - Vifa woofers/mids & Seas tweeters & X-overs dtm1962 Swap Meet 2 25th November 2006 12:05 AM
FS - 2 x Vifa P17 Woofers, 2 x Vifa D25AG Tweeters Xristo Swap Meet 2 27th November 2005 10:55 PM
fabric dome tweeters (Seas vs. Vifa) kamppi Multi-Way 16 17th February 2004 01:15 PM


New To Site? Need Help?

All times are GMT. The time now is 12:40 PM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright 1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2