Isobaric JBL/RCF 18's - 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 23rd November 2011, 02:26 PM   #1
diyAudio Member
 
Join Date: Sep 2007
Default Isobaric JBL/RCF 18's

I have 4-JBL 2240's and 4-RCF 18's(pulled from a pair of Yorkville Elite sub 1000 cabinets) and was curious of a isobaric configuration.I know these need at least 12ft3 so I thought about making the smaller boxes would work.I am not sure if I would get the 15-20hz out of them? or wheather this would even work,but instead of buying new subs,I thought I would ask you fella's.
I have lots of power on tap and a open mind.
thanks
__________________
thanks John
  Reply With Quote
Old 23rd November 2011, 06:12 PM   #2
diyAudio Member
 
Join Date: Sep 2008
If you plan to mount the magnet outward, do check for cooling noise before you decide.
Especially with RCF.
  Reply With Quote
Old 24th November 2011, 11:47 PM   #3
diyAudio Member
 
Join Date: Sep 2007
thanks dave
I wonder what kind of results I could get with these drivers in this configuratiou with about 1600 watts at 4ohms/3200 at 2ohms
__________________
thanks John
  Reply With Quote
Old 3rd September 2012, 01:28 PM   #4
diyAudio Member
 
Join Date: Sep 2007
Hi guys
I am looking into the JBL 2245's in a isobaric box.
Has anyone tried this?
__________________
thanks John
  Reply With Quote
Old 3rd September 2012, 07:29 PM   #5
tb46 is offline tb46  United States
diyAudio Member
 
Join Date: Jan 2006
Location: Texas
Hi mclsound,

Using the manufacturer's data in Hornresp:

Regards,
Attached Images
File Type: jpg JBL_2245H_Input.jpg (37.1 KB, 192 views)
File Type: jpg JBL_2245H_SPL.jpg (28.0 KB, 191 views)
__________________
Oliver
  Reply With Quote
Old 5th September 2012, 10:13 AM   #6
ODougbo is offline ODougbo  United States
diyAudio Member
 
Join Date: Aug 2011
Location: Maryland USA
Well that looks great.........I been thinking this may be a obvious choice to keep the box size down (for a huge woofer). And I really like the sound of an Iso, it's deep throated.

What is the risk of having problems with the two cones staying aligned? I know sometimes one can push the opposing cone with air build up in the tunnel.

Do some designs vent the tunnel (1/16" hole), that seems like a double edge sword.

I would guess this is less of a problem with more "springy" suspension drivers.
  Reply With Quote
Old 6th September 2012, 12:36 PM   #7
bjorno is offline bjorno  Sweden
diyAudio Member
 
Join Date: Mar 2005
Location: Jacobsmountain
Send a message via MSN to bjorno
Quote:
Originally Posted by mclsound View Post
Hi guys
I am looking into the JBL 2245's in a isobaric box.
Has anyone tried this?
FYI,

FYI,My view of possibilities for isobaric configured JBL 2245H's:

b
Attached Images
File Type: jpg JBL_2245H_iso-Ported_BR.JPG (945.1 KB, 155 views)
  Reply With Quote
Old 6th September 2012, 05:20 PM   #8
bjorno is offline bjorno  Sweden
diyAudio Member
 
Join Date: Mar 2005
Location: Jacobsmountain
Send a message via MSN to bjorno
In parallell mode:

b
Attached Images
File Type: jpg 2xJBL2245H-8-in parallel_T-TQWT.JPG (774.3 KB, 126 views)
  Reply With Quote
Old 9th September 2012, 04:47 PM   #9
diyAudio Member
 
Join Date: Sep 2007
Hey,thanks guys.
so what are some optins in dimentions here? I would like to keep it as low in profile as possible and can use a square/rectangle vent also as I find them to help with bracing.Obviously to get access to the woofers would mean a push/pull or ?
I do have lots to learn but I can build,so now I need help with some plans.This is for 2ch music at high SPL in a 4way active system consisting of several other JBL parts.
__________________
thanks John
  Reply With Quote
Old 30th September 2012, 12:21 PM   #10
diyAudio Member
 
Join Date: Sep 2007
Can we put a pair on the sides of the cabinets in say a push/pull with good results?
__________________
thanks John
  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
fs Ciare, JBL, morel, rcf, peerless, audax pinkrabbit Swap Meet 28 23rd January 2013 01:49 PM
peavey 18's dan Multi-Way 16 14th April 2011 06:28 PM
EV 18's on Ebay DLSryker Vendor's Bazaar 0 22nd January 2011 03:34 AM
EAW dual 18's billybob Subwoofers 1 9th August 2008 11:07 AM
Dual 18's RacerXtreme Multi-Way 36 10th April 2006 10:52 AM


New To Site? Need Help?

All times are GMT. The time now is 07:45 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