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

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 18th May 2004, 06:51 AM   #1
caz is offline caz  United States
diyAudio Member
Join Date: Apr 2004
Location: sac
Default crossovers

whats it mean when a crossover is 2nd order or 4th order or whatever. i saw recomenations fo some crossovers on speakers i was looking at. it said 2nd order 2500herts highpass. do i need something special or can i just use the crossover on my linear power dspq50. i can reach a 5k highpass with it, and it says its a 12db ocatve slope.

what the hell does 12db octave even mean lol
  Reply With Quote
Old 18th May 2004, 10:03 AM   #2
sreten is offline sreten  United Kingdom
Join Date: Nov 2003
Location: Brighton UK
6dB/octave = 1st order, for a tweeter a series capacitor
12dB/octave = 2nd order, for a T series cap + parallel inductor
18dB/octave = 3rd order, s cap, p inductor, s cap.
24db/octave = 4th order, s cap, p L, s cap, p L.

  Reply With Quote
Old 18th May 2004, 12:14 PM   #3
BobEllis is offline BobEllis  United States
diyAudio Member
BobEllis's Avatar
Join Date: Sep 2003
Location: Upstate NY
And an octave change is a doubling or halving of frequency - eg. 100 Hz is an ocatve below 200 Hz and an octave above 50 Hz.

So a 24 db/octave 1000 Hz filter will pass 24 db less signal at 2,000 Hz than it does in the flat region below 1,000 Hz. at 4,000 Hz the signal passed is 24 db lower still.

This is just an approximation because real filters start to roll of gradually a little before their designated cutoff frequency and take a little while to reach the final slope. the "corner" of the filter is not sharp, but approximating it this way should let you get a basic understanding of the concept.

Of course, the devil is in the details and crossover behavior in the overlap region as affected by driver response is why standard crossover filters rarely work well.

The overlap between drivers is much more than you'd think even with steep slopes. I turned off the mid-bass amp of my actively crossed over system first when shutting down, so just the sub and tweeeter were playing. Crossovers are nominally 4th order at 60 and 2400 Hz. I was surprised how much music was still there. Male voices were still intelligible through the tweeter.

  Reply With Quote


crossoversHide 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
Crossovers IMSTOOPID Car Audio 0 2nd December 2008 12:39 AM
crossovers tonysherwin Multi-Way 3 18th May 2008 12:30 AM
crossovers tonysherwin Multi-Way 1 16th May 2008 10:18 AM
WTB: B&W 801 crossovers aarsoe Swap Meet 0 6th October 2004 03:47 PM
crossovers grim Multi-Way 3 22nd February 2001 01:52 AM

New To Site? Need Help?

All times are GMT. The time now is 10:11 PM.

Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 16.67%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
Copyright ©1999-2017 diyAudio