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

Acoustic plus electric rolloff crossover question
Acoustic plus electric rolloff crossover question
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
Thread Tools Search this Thread
Old 24th January 2010, 05:54 AM   #1
Tyson is offline Tyson  United States
diyAudio Member
Join Date: Feb 2009
Default Acoustic plus electric rolloff crossover question

I've got the center of my midrange and the center of my tweeter a little over 8 inches apart. This means, ideally, I'd like a crossover set to 1.6khz. I believe my tweeter starts to roll off acoustically at about 1.7khz naturally (I've measured it). I'm using an active DCX2496 crossover to try to hit my target.

My question is - if I select an electrical crossover at 1.3khz LR2, which seems to give me the slope I want, how concerned do I need to be about my crossover (and amp) sending an almost full signal to the tweeter at 1.3khz? I know that with dome tweeters, over-excursion is a concern, so even though my slope is acoustically doing what I want at 1.6khz, it seems like there would be distortion or excursion concerns by sending it such a high-powered low frequency signal. Am I crazy, or is this something I need to worry about?
  Reply With Quote
Old 24th January 2010, 02:32 PM   #2
djarchow is offline djarchow  United States
diyAudio Member
Join Date: Apr 2007
What tweeter are you using? Very few tweeters like to be crossed at 1.3 Khz. In any case, even with a robust tweeter, you would still want to use pretty steep electrical slope, especially with it being at 1.3 kHz. However some of it depends on how loud you are going to listen since the level will drive the excursion.

The best way to make the decision would be with some distortion measurements if you have that ability. In any case, I would personally live with a less than ideal higher XO point to avoid the distortion and the potentail for damaging the tweeter.

Good luck,

  Reply With Quote
Old 25th January 2010, 12:54 AM   #3
JoshK is offline JoshK  Canada
diyAudio Member
Join Date: May 2004
Location: Toronto, ON
From my understanding, which could fill a thimble, the acoustic roll-off doesn't limit power to the driver, only electrical does. So with this in mind, it would seem there is potential for over-excursion. Maybe SL's spreadsheet can model the excursion?

You question is very astute. I am afraid, I don't know the definitive answer.

I'd probably bend the c-t-c spacing rule by moving the xo up to 1.7khz rather than meet the c-t-c demands and stress the tweeter. The prior seems to me to be the less audible consequence.
  Reply With Quote


Acoustic plus electric rolloff crossover questionHide 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
F/S Brand New Taylor 712CE acoustic electric guitar (Natural) davismark Vendor's Bazaar 0 17th December 2008 09:06 PM
Combined acoustic/electric rolloff niacin Multi-Way 9 14th June 2007 10:02 PM
Electric motor capacitor for crossover ? djdan Multi-Way 15 12th October 2004 04:10 PM
equivalence electric and mechanical (acoustic) correction SPL alex0 Multi-Way 2 26th February 2004 11:10 PM
question on rolloff below 100Hz wintermute Chip Amps 4 16th December 2003 03:23 AM

New To Site? Need Help?

All times are GMT. The time now is 06:32 AM.

Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 15.79%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Copyright ©1999-2018 diyAudio