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 15th February 2006, 04:12 AM   #1
diyAudio Member
 
Join Date: Jun 2003
Location: Singapore
Default Two ports in a 2-way bass-reflex speaker

I am thinking of putting in two ports at different frequencies to even out the bass response for a 2-way bookshelf speaker I am building. What are the implications of using 2 ports, instead of 1 port?

Thanks!
  Reply With Quote
Old 15th February 2006, 08:36 AM   #2
sreten is offline sreten  United Kingdom
diyAudio Member
 
Join Date: Nov 2003
Location: Brighton UK
Hi,

two staggered tuning ports should be tuned fairly near to each other.

If they are widely tuned, the lower tuned port is basically ineffective,
and the result is esssentially the same as one higher tuned port.

/sreten.
  Reply With Quote
Old 15th February 2006, 08:42 AM   #3
Did it Himself
diyAudio Member
 
richie00boy's Avatar
 
Join Date: Nov 2003
Location: Gloucestershire, England, UK
That is true in theory, but this user has found possibly different results in real life.

http://www.diyaudio.com/forums/showt...207#post823207

Start from that point and read the successive posts
__________________
www.readresearch.co.uk my website for UK diy audio people - designs, PCBs, kits and more.
  Reply With Quote
Old 15th February 2006, 10:41 AM   #4
sreten is offline sreten  United Kingdom
diyAudio Member
 
Join Date: Nov 2003
Location: Brighton UK
Quote:
Originally posted by richie00boy
That is true in theory, but this user has found possibly different results in real life.
Hi,

two identical ports with length ratio's of 1.4 gives frequency
ratios of ~1.2. e.g. 40Hz and 47Hz, or 47 Hz and 56hz.

The thread indicates if anything the theory to be true,
as the higher tuned port has more effect than the lower.

/sreten.
  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
bass-reflex with 2 different ports? andrew24 Subwoofers 6 4th July 2009 02:54 AM
Bass reflex theory: multiple ports Qp TG Multi-Way 3 18th November 2005 05:34 PM
8-12" Bass reflex Full range Corner speaker (mono) Howismydriving Full Range 2 23rd October 2005 07:50 AM
Do you stuff a bass-reflex speaker? type Multi-Way 10 23rd January 2005 01:27 AM
Nice looking reflex ports mark.carline Multi-Way 2 10th May 2004 06:39 PM


New To Site? Need Help?

All times are GMT. The time now is 04:09 PM.


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