Go Back   Home > Forums > >
Home Forums Rules Articles diyAudio Store Blogs Gallery Wiki Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

Multi-Way Conventional loudspeakers with crossovers

crossover question Measure at 2500?
crossover question Measure at 2500?
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 1st January 2007, 04:39 AM   #1
ben62670 is offline ben62670  United States
diyAudio Member
 
Join Date: Dec 2006
Send a message via Yahoo to ben62670
Default crossover question Measure at 2500?

Do I need to know the impedence at 2500 to build a crossover, or do I just go by them factory nominal rating?

Thanks Ben
  Reply With Quote
Old 1st January 2007, 01:26 PM   #2
sreten is offline sreten  United Kingdom
R.I.P.
 
Join Date: Nov 2003
Location: Brighton UK
Hi,

Neither. Build a documented and tested design.

/sreten.
  Reply With Quote
Old 1st January 2007, 02:11 PM   #3
ben62670 is offline ben62670  United States
diyAudio Member
 
Join Date: Dec 2006
Send a message via Yahoo to ben62670
Been there done that. I have a bunch of Polk drivers that i want to build a speaker for. They are rated at 8 ohms, but I know the the imp changes with frequency. I have read Weems book on speaker building, and have seen different calculators on the net. They all assume that speakers are 4 or 8 ohms. I know frequency changes resistance so if the woofers go up to 12 ohms at 2500 do I need to build a crossover at 12 ohms or 8?

Thanks much Ben
  Reply With Quote
Old 1st January 2007, 03:00 PM   #4
sreten is offline sreten  United Kingdom
R.I.P.
 
Join Date: Nov 2003
Location: Brighton UK
Hi,

Its far more complicated than that. Possibly start here :

http://www.rjbaudio.com/Audiofiles/FRDtools.html

/sreten.
  Reply With Quote
Old 1st January 2007, 03:27 PM   #5
ben62670 is offline ben62670  United States
diyAudio Member
 
Join Date: Dec 2006
Send a message via Yahoo to ben62670
I realize that building a crossover isn't a simple first shot kinda deal. I would just like an idea where to start. The seas tweeters I have selected are 6 ohms and dip to 5 ohms at 2500. There are plenty of calculators out there where you plug in the ohms of the speakers, crossover point, and what type of crossover you want to use. So my ? is pretty simple do I say 6 or 5 ohms?
Thanks for the link. Here is the site that I have been using for reference.

http://www.lalena.com/Audio/

Thanks Again Ben
  Reply With Quote
Old 1st January 2007, 03:32 PM   #6
pinkmouse is offline pinkmouse  Europe
diyAudio Moderator
 
pinkmouse's Avatar
 
Join Date: Apr 2002
Location: Rotherham, England
crossover question Measure at 2500?
You need to measure the impedance rise with Speaker Workshop, Arta, or similar, and calculate a Zobel network to flatten the impedance curve.
__________________
Rick: Oh Cliff / Sometimes it must be difficult not to feel as if / You really are a cliff / when fascists keep trying to push you over it! / Are they the lemmings / Or are you, Cliff? / Or are you Cliff?
  Reply With Quote
Old 1st January 2007, 04:18 PM   #7
ben62670 is offline ben62670  United States
diyAudio Member
 
Join Date: Dec 2006
Send a message via Yahoo to ben62670
Thanks much. I do have speaker workshop, and I do plan on plotting out the woofers because Polk gives no specs with there woofers. They just sell replacement parts. Not a DIY supplier.
  Reply With Quote

Reply


crossover question Measure at 2500?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

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Easiest and fastest way to measure a crossover's transfer function? 454Casull Analog Line Level 3 26th August 2009 08:52 AM
Crossover Question ppfred Multi-Way 3 10th May 2006 10:16 AM
Speaker Workshop - using "Measure -> Passive Components" to measure ESR ? percy Multi-Way 0 12th March 2006 10:18 PM
Crossover Question cantskienuf Multi-Way 4 13th October 2004 10:59 PM
Crossover question Ilianh Multi-Way 3 5th January 2003 06:48 AM


New To Site? Need Help?

All times are GMT. The time now is 01:45 PM.


Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 16.67%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Copyright ©1999-2018 diyAudio
Wiki