Acoustic plus electric rolloff crossover question - 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 24th January 2010, 06:54 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, 03:32 PM   #2
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,

Dennis
  Reply With Quote
Old 25th January 2010, 01:54 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

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
F/S Brand New Taylor 712CE acoustic electric guitar (Natural) davismark Vendor's Bazaar 0 17th December 2008 10:06 PM
Combined acoustic/electric rolloff niacin Multi-Way 9 14th June 2007 11:02 PM
Electric motor capacitor for crossover ? djdan Multi-Way 15 12th October 2004 05:10 PM
equivalence electric and mechanical (acoustic) correction SPL alex0 Multi-Way 2 27th February 2004 12:10 AM
question on rolloff below 100Hz wintermute Chip Amps 4 16th December 2003 04:23 AM


New To Site? Need Help?

All times are GMT. The time now is 07:18 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