Which filter alignment for sub... - diyAudio
Go Back   Home > Forums > Amplifiers > Solid State

Solid State Talk all about solid state amplification.

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 12th October 2003, 01:02 PM   #1
diyAudio Moderator
 
JojoD818's Avatar
 
Join Date: Mar 2003
Location: searching...
Default Which filter alignment for sub...

Hi everyone,

How does one choose a filter alignment for a specific application such as a sub amp? Does a Linkwitz-Reiley low pass filter better for this application than a Butterworth? Or is there a more precise alignment for every application?

I know what an order means but for sub applications, must I use a 24dB than an 18dB one? If it is better to use higher order filters then why are those lower order filters like a 6dB exist?

Thanks for the enlightment...
JojoD
  Reply With Quote
Old 13th October 2003, 12:17 AM   #2
AJT is offline AJT  Philippines
diyAudio Moderator
 
AJT's Avatar
 
Join Date: May 2003
Location: Palatiw, Pasig City
Default depends on what components you want to use

a 6db implies pasive single component like a choke or capacitor,
__________________
the best advertisement for a good audio design is the number of diy'ers wanting to build it after all the years....never the say so of so called gurus....
  Reply With Quote
Old 13th October 2003, 02:13 AM   #3
diyAudio Member
 
ashok's Avatar
 
Join Date: Jun 2002
Location: 3RS
Default Is it a 'real' sub.

I would think that if you were building a real sub , meaning that it works only below 100Hz or so, you should use a higher order crossover. An active Linkwitz Riley 24db per octave crossover would be preferable . This will ensure that higher frequencies are really well attenuated. If this is not so , it could lead to localisation of the sub. Even a trace of low end voice ( about 200Hz ?) is not good IMO. The sub should actually not be 'heard' when used in a system. By this I mean that it should not be possible to trace the sound to the sub. If you use a low slope crossover you can pick out the sub because higher frequencies ( directional sounds) will also be ( audibly) reproduced from it.
The crossover frequency should be determined by the low end of your main speakers. It is not an arbitrary choice. You need measured data to do this effectively.
On a reflex system you can close the duct and get a 12db slope and add another (active) 12 db to get 24 db for the main speakers. The Q of the crossover will depend on the Q of the main speaker. Using it in reflex mode ( if it is already that way ) already gives it a 24db slope but it may not be as close to ideal as a sealed box which also helps in power handling capability .
A reflex is good when well set up. It can be awful otherwise.
Cheers.
__________________
AM
  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
Anyone reverse eng. 801 bass alignment filter? Michael Rothacher Multi-Way 10 9th October 2013 01:13 PM
need help wana change 60-Hz twin-T notch filter to 279 Hz filter prorms Solid State 0 9th February 2008 11:38 PM
Sig gen for FM alignment, diy? Conrad Hoffman Parts 10 15th December 2007 11:02 PM
active filter from rod elliot and sub filter questions wuffer Parts 0 2nd October 2005 01:12 PM
chassis-mounted filter or IEC plug filter jarthel Solid State 7 11th March 2002 10:17 AM


New To Site? Need Help?

All times are GMT. The time now is 10:38 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