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 11th February 2008, 07:51 PM   #1
diyAudio Member
 
Join Date: Feb 2008
Default Dayton RS 7"/ Vifa XT25 tweeter Crossover

Hey all,

I am just wondering if anyone has by chance implemented this driver configuration in a DIY project, and if so what crossover was used? Considering i am currently using an apple laptop, the majority of crossover/speaker design programs are not compatible, so my ability to effectively design the ideal crossover has been nearly impossible. I am currently using a basic 2nd order LR 2k crossover with mixed results.
Loudspeaker details:
Dayton RS 4ohm 7" woofer
Vifa XT25 4ohm duel concentric dome tweeter
The woofer is enclosed in a ~16,000cm^3 vented enclosure with a 6" long 2" wide port.
I realize that my 2nd order 2k crossover is far from idea for the tweeter, so shifting the crossover point up is not an issue.
If anyone has any insight as to possible beneficial modifications i can make to my current crossover or a completely new improved crossover design, any suggestions are more than welcome. Thank you for your time and input, cheers, LukeDuke
  Reply With Quote
Old 12th February 2008, 05:59 AM   #2
diyAudio Member
 
Join Date: Jan 2002
Location: Wellington, New Zealand
Not related to your design question - (and I'm not an apple person) but depending on your version of the apple OS and h/w spec - can you run parallels or something similar and run up WinXP. Then you could run something like Speaker Workshop.

The other option is download at SourceForge and port/compile - depending on your 'puter capabilities.

Cheers,
David.
  Reply With Quote
Old 12th February 2008, 05:08 PM   #3
Dag is offline Dag  Sweden
diyAudio Member
 
Dag's Avatar
 
Join Date: Feb 2005
Location: Goteborg
Hey, hey, hey!!! LR2 at 2k sucks...LR2 at 2.5k sucks....LR4 at 3k...NICE!
  Reply With Quote
Old 13th February 2008, 12:44 AM   #4
diyAudio Member
 
Join Date: Feb 2008
Default thanks

thank you for your responses, much appreciated
  Reply With Quote
Old 13th February 2008, 05:39 AM   #5
diyAudio Member
 
Join Date: Jan 2002
Location: Wellington, New Zealand
Luke,

Can you post your crossover schematic so we can take a look?

The RS series (infact all metal drivers I've seen) have a breakup mode higher up. This results in higher odd order distortion products down in the frequency spectrum. This means most designers I've seen using metal cone drivers, tend to put the crossover point low - ie. before where 1st, 3rd or 5th order products are within -40dB from the reference level of the fundamental. Check out Zaph's website for hsi published designs and any driver measurements he's posted with harmonic distortion and you'll get the picture.

This means crossing over the 7" dayton as low as you can before tweeter distortion becomes worse than the woofer distortion you are trying to attenuate.

The XT25 is a nice tweeter to get an LR2 target acoustic slope from due to its shallow and controlled low end rolloff. However, you can't cross it too low if you are going 2nd order acoustic as too much power will be fed to it.

You should be able to make these drivers work - but you might be looking at 4th order on the RS 7" with 4th (or asymetric) order on the XT25 as Dag suggested.

I think 3KHz however is too high for the Dayton 7" RS. Harmonic distortion aside, you might find directivity a problem and some uneveness in the power (off-axis) response due to beaming.

Cheers,
David.
  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
Vifa xt25 tweeter Per Nielsen Multi-Way 67 12th March 2010 05:58 PM
Vifa Xt25 + P13wh + Dayton RS180-8 your thoughts? K-amps Multi-Way 14 25th July 2008 05:51 PM
WTB: Scanspeak 5" and Vifa XT25 Irons82 Swap Meet 2 15th July 2007 11:51 PM
Choosing tweeter SS 9500, 9800 or Vifa XT25 ? santi Multi-Way 5 21st January 2005 08:41 PM
opinions on the new VIFA dual conc. tweeter XT25 grataku Multi-Way 25 5th June 2002 06:10 AM


New To Site? Need Help?

All times are GMT. The time now is 08:00 AM.


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