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-   -   Isobaric JBL/RCF 18's (http://www.diyaudio.com/forums/subwoofers/201047-isobaric-jbl-rcf-18s.html)

mclsound 23rd November 2011 01:26 PM

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

David_Web 23rd November 2011 05:12 PM

If you plan to mount the magnet outward, do check for cooling noise before you decide.
Especially with RCF.

mclsound 24th November 2011 10:47 PM

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

mclsound 3rd September 2012 12:28 PM

Hi guys
I am looking into the JBL 2245's in a isobaric box.
Has anyone tried this?

tb46 3rd September 2012 06:29 PM

2 Attachment(s)
Hi mclsound,

Using the manufacturer's data in Hornresp:

Regards,

ODougbo 5th September 2012 09:13 AM

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.

bjorno 6th September 2012 11:36 AM

1 Attachment(s)
Quote:

Originally Posted by mclsound (Post 3150269)
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:)

bjorno 6th September 2012 04:20 PM

1 Attachment(s)
In parallell mode::D

b:)

mclsound 9th September 2012 03:47 PM

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.

mclsound 30th September 2012 11:21 AM

Can we put a pair on the sides of the cabinets in say a push/pull with good results?


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