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

Exploring Purifi Woofer Speaker Builds
Exploring Purifi Woofer Speaker Builds
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 Today, 12:07 AM   #441
xyvyx is offline xyvyx  United States
diyAudio Member
Join Date: Aug 2018
Location: TX
mmm.. beefy. So I was fiddling with WinISD and it lead me down this path. "Why not go with an external port?" a friend suggested.
Click the image to open in full size.

Turns out, tuned to 35hz, you'd need a ~ 25" long port at 3" in diameter. Same height as I'd use for some stands. So I abandoned my idea for an internal, 3D printed port/flares and got some aluminum pipe. It didn't list the OD or thickness, but as it turns out, Schedule-40 aluminum pipe in this size is 1/4" thick. So yeah... beefy.

I'm gonna try to make the way I attach it to the bottom of the box sorta "modular" so that I could maybe try a slot-load something something in the future. We'll see.

So.. am I missing something? is a big, long port w/ this smallish driver dumb?
Audio stuff - Album on Imgur
  Reply With Quote
Old Today, 01:39 AM   #442
xrk971 is online now xrk971  United States
Got Foam?
diyAudio Member
xrk971's Avatar
Join Date: Oct 2012
Location: Metro DC (Virginia)
Exploring Purifi Woofer Speaker Builds
You should make your port smaller dia and shorter. The problem with a 25on port is that it is long enough to have pipe harmonics and 1/2 wave is 270Hz - right in your critical mid bass region, and the 1/4wave is 135Hz right at your upper bass where “slam” is felt. A more reasonable length is say 7in or 9in. Or just use a passive radiator. There’s a reason vents aren’t not 2 ft long (except on huge car audio subs where they low pass it at 80Hz).

Also, it makes no sense to spend so much money on thick wall 25in long aluminum pipe. That’s pricey stuff when a PVC pipe will work just as fine. It’s internally hidden right? It’s not providing structural support is it?
XRKaudio https://www.etsy.com/shop/XRKAudio

Last edited by xrk971; Today at 01:43 AM.
  Reply to this post


Exploring Purifi Woofer Speaker BuildsHide 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
Purifi PTT6.5W04-01A woofer group buy CANADA sperrey Group Buys 0 25th February 2020 02:15 AM
Clearing out DIY speaker builds pjblakey Swap Meet 0 4th July 2013 04:07 PM
Do you use BSC on desktop speaker builds? mayhem13 Multi-Way 3 4th April 2013 11:46 PM
Where to start with DIY speaker builds? Kooshball Multi-Way 50 27th August 2012 10:41 AM
My first speaker builds - Thanks for the help stuartdj_x Multi-Way 13 19th October 2005 01:06 PM

New To Site? Need Help?

All times are GMT. The time now is 02:11 AM.

Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2020 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 15.00%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2020 DragonByte Technologies Ltd.
Copyright ©1999-2020 diyAudio