Flex hose as port in vented cabinet ? - Page 2 - diyAudio
Go Back   Home > Forums > Loudspeakers > Subwoofers

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 February 2007, 04:14 PM   #11
diyAudio Member
 
Jan Dupont's Avatar
 
Join Date: Apr 2003
Location: Copenhagen, Denmark
Send a message via MSN to Jan Dupont
I won't argue with you regarding your calc of air speed

However I know that this driver in a 125 liter (cf ???) cabinet with a single 10 cm flared port (correction from one of my first posts 10 cm = 3.9") plays down to 25 Hz at high power without any port noise...... The guy who calculated this for me has uses such speakers.

However I will of course describe the listining result here soon
__________________
Free Schematic and Service Manual downloads www.audio-circuit.dk, Company: www.dupont-audio.com, Joint venture: www.DupontMantra.com
  Reply With Quote
Old 12th February 2007, 04:43 PM   #12
Puggie is offline Puggie  United Kingdom
diyAudio Member
 
Join Date: Oct 2004
A better option may be the reinforced plastic hose used for water and 'trash' pumps. its available in sizes from 2" to about 6" dia and is a thicker harder version of what you showed originally. a PVC flexible (quite stiff though) hose with a spiral wire reinforcement. I have considered using it before, but never had a need to. Try Hardware and industrial pump equipment sales.

http://www.machinemart.co.uk/shop/ra...valves-filters

click on the non existant image in the upper left corner of the main window to see what I'm talking about, I'm sure you can get larger than 3".
  Reply With Quote
Old 12th February 2007, 04:48 PM   #13
diyAudio Member
 
Jan Dupont's Avatar
 
Join Date: Apr 2003
Location: Copenhagen, Denmark
Send a message via MSN to Jan Dupont
Thnks for the input, Puggie
I will also look for this kind of hose.
__________________
Free Schematic and Service Manual downloads www.audio-circuit.dk, Company: www.dupont-audio.com, Joint venture: www.DupontMantra.com
  Reply With Quote
Old 13th February 2007, 10:51 PM   #14
Ron E is offline Ron E  United States
diyAudio Member
 
Ron E's Avatar
 
Join Date: Jun 2002
Location: USA, MN
On second thought, I would just use a PR...or two.
__________________
Our species needs, and deserves, a citizenry with minds wide awake and a basic understanding of how the world works. --Carl Sagan
Armaments, universal debt, and planned obsolescence--those are the three pillars of Western prosperity. Aldous Huxley
  Reply With Quote
Old 13th February 2007, 11:40 PM   #15
AKN is offline AKN  Sweden
No snake oil
diyAudio Member
 
AKN's Avatar
 
Join Date: Aug 2005
Location: In the middle of Sweden
Send a message via MSN to AKN
Hi ACD,

Although not your thread subject, i must agree that one 4" port is very little for your box size, tuning and power.
Simulation with one 15" JBL 2235H in 125L box, 25Hz tuning, one 4" port and 150W input.
Attached Images
File Type: jpg 2235h.jpg (32.9 KB, 142 views)
__________________
/ Anders
  Reply With Quote
Old 17th March 2007, 04:33 PM   #16
diyAudio Member
 
Jan Dupont's Avatar
 
Join Date: Apr 2003
Location: Copenhagen, Denmark
Send a message via MSN to Jan Dupont
I promissed to return

Got the complete speaker sets up and running (though at the moment using a passive crossover). So fare no problems with the ports using my AMCRON's DC300 Series II in bridge configuration, however I can imagine using higher power than 300W you just put your face in front of the ports and you don't have to shave

More information on www.audio-circuit.dk under my projects
Attached Images
File Type: jpg woofer_1_diy.jpg (68.4 KB, 104 views)
__________________
Free Schematic and Service Manual downloads www.audio-circuit.dk, Company: www.dupont-audio.com, Joint venture: www.DupontMantra.com
  Reply With Quote
Old 17th March 2007, 06:25 PM   #17
mikee55 is offline mikee55  United Kingdom
diyAudio Member
 
mikee55's Avatar
 
Join Date: Dec 2005
Location: West Howe
Default Can I just add....

....I've used a mitre saw to cut an angle through a pipe to mike a 90 deg turn. Or you could use elbow pieces. I just wanted to put this here to give others ideas.

Cheers mikee55
__________________
If it don't work, I'll fix it in the mix! Or visit http://lsdp.proboards.com/index.cgi
  Reply With Quote
Old 17th March 2007, 08:24 PM   #18
diyAudio Member
 
Jan Dupont's Avatar
 
Join Date: Apr 2003
Location: Copenhagen, Denmark
Send a message via MSN to Jan Dupont
On this first test run I did use 90 deg. elbow pieces
__________________
Free Schematic and Service Manual downloads www.audio-circuit.dk, Company: www.dupont-audio.com, Joint venture: www.DupontMantra.com
  Reply With Quote
Old 27th March 2007, 02:15 PM   #19
OzMikeH is offline OzMikeH  Australia
diyAudio Member
 
Join Date: Mar 2007
Don't forget you can get 45 degree PVC bends.

There are some Wide radius bends available, these are for electrical conduit to make it easy to pull cables into buildings.. I have seen these in 100mm with a bend radius of about 400mm

These are usually very thick PVC becasue they are designed to be cast into concrete slabs
  Reply With Quote
Old 27th March 2007, 03:53 PM   #20
diyAudio Member
 
Jan Dupont's Avatar
 
Join Date: Apr 2003
Location: Copenhagen, Denmark
Send a message via MSN to Jan Dupont
Thanks OzMikeH
__________________
Free Schematic and Service Manual downloads www.audio-circuit.dk, Company: www.dupont-audio.com, Joint venture: www.DupontMantra.com
  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
L-shaped port for vented design runethechamp Multi-Way 3 27th May 2009 05:11 AM
T-line within vented cabinet? mantraxl Multi-Way 3 13th February 2008 03:53 AM
Good idea to close the port on a vented 8-inch 2-way ? brjoon1021 Multi-Way 6 10th December 2007 09:46 PM
vented cabinet testing with woofer tester jaya000 Subwoofers 1 17th November 2007 08:39 PM
Reflex port under the cabinet ?? gary f Multi-Way 21 26th October 2003 10:17 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