help tuning push-push ApexJr super 8 woofer - Page 3 - 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 27th September 2005, 09:56 AM   #21
frugal-phile(tm)
diyAudio Moderator
 
planet10's Avatar
 
Join Date: Oct 2001
Location: Victoria, BC, NA, Sol III
Blog Entries: 5
Quote:
Originally posted by jdybnis
What kind of cross brace did you use between the two drivers? I'm thinking of epoxying a few hardwood dowels between the backs of the drivers.
The structural brace between all the side walls was notched so that the magnets butted up against it.

dave
__________________
community sites t-linespeakers.org, frugal-horn.com, frugal-phile.com ........ commercial site planet10-HiFi
p10-hifi forum here at diyA
  Reply With Quote
Old 27th September 2005, 02:24 PM   #22
jdybnis is offline jdybnis  United States
diyAudio Member
 
Join Date: Jul 2004
Location: Pasadena, CA
I'll give that a shot before I start messing with epoxying the drivers.
  Reply With Quote
Old 28th September 2005, 04:00 AM   #23
GM is offline GM  United States
diyAudio Member
 
GM's Avatar
 
Join Date: Jun 2003
Location: Chamblee, Ga.
Greets!

Just plugging the numbers into the ML-TQWT WS I get a T/S max flat with some peaking at Fb and another program calc's a bit high vent mach, so the need to 'stick a sock in it' is understandable.

FWIW, last year I took a look at this driver for someone and came up with this T/S max flat Voigt style dual driver pipe, but if they built it I never heard back, so as always YMMV:

L = 54"
SO = 1.122"^2 (physically comes to a point)
SL = 130.452"^2
rp = 2.121" (for simmimg purposes, build using dual 3" dia.)
Lp = 13"
drivers down 35.38"

It sims somewhat better damped for its much greater Vb than the BR of course, but like any max flat alignment it may sound a bit 'one note' in-room with this low an Fb, so I recommend bottom firing and possibly some vent damping for it also if near a wall or corner.

GM
__________________
Loud is Beautiful if it's Clean! As always though, the usual disclaimers apply to this post's contents.
  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
Isobaric push-pull with Dayton IB woofer tinitus Subwoofers 8 7th December 2010 12:32 AM
Push-pull woofer alignment 3-LockBox Subwoofers 0 26th June 2007 02:40 PM
Photos - My first T-Line Push-Push Subwoofer :) Xmax BR Subwoofers 6 23rd June 2005 08:17 PM
damaged cone usage (push push?) kneadle Multi-Way 24 27th January 2003 04:51 PM
Qts of Push-pull woofer and Compound Woofer System... haggy Multi-Way 1 13th December 2001 01:30 AM


New To Site? Need Help?

All times are GMT. The time now is 06:46 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