JBL 2231A Enclosure

[sergelisses]

Hello

I have just one JBL 2231A and i would like to make a "SUBWOOFER " .
Not an abyssal subwoofer just a good 30hz ( to listen to correctly the bass guitar )

So please i need good advices and details for the construction

Best regards

Serge

[Zilch]

4507, 5 cuft., vary the tuning by closing one or more of the four ports....

[sergelisses]

4507, 5 cuft., vary the tuning by closing one or more of the four ports....

Sorry but i am not a specialist ,i don't realy understand what it means !!!!

Serge

[hjames]

4507, 5 cuft., vary the tuning by closing one or more of the four ports....

Sorry but i am not a specialist ,i don't realy understand what it means !!!!

Serge

Zilch was referrring to a JBL Enclosure Model number - the 4507 ... box size contains 5 cubic feet of volume - build or get one of them & close off some of the ports to lower the frequency ...

Find more info by doing a Search on this site for "4507"

this thread about building a 4507 should help ..
http://audioheritage.org/vbulletin/s...highlight=4507

[sergelisses]

Thank you for your anwsers .

What are the differences between the B380 and the 4507 enclosures ?

Serge

[hjames]

Thank you for your anwsers .

What are the differences between the B380 and the 4507 enclosures ?

Serge

Don't know off the top of my head - but info on building a B-380 are here ...

http://www.lansingheritage.org/html/.../1983-subs.htm

specifics are here

http://www.lansingheritage.org/image...subs/page7.jpg

[Russellc]

This is the box Zilch is talking about. it has four ports and is tuned to 40 hz I believe, by plugging varying ports, the tuning can be lowered.

Russellc

[sergelisses]

What are the best amplifier to drive a 2231A ( not the more expensive )

Serge

[sergelisses]

I have a small problem with my 2231A .
When the music is very low ,i hear a little noise ("crackling paper" i think it comes from the spider)

What can i do ?

Serge

[hjames]

I have a small problem with my 2231A .
When the music is very low ,i hear a little noise ("crackling paper" i think it comes from the spider)

What can i do ?

Serge

Turn the box upside down and on it side to see if the crackling sound changes.

[sergelisses]

When I push the cone with my fingers i have the same noise !!!
Serge

[toddalin]

When I push the cone with my fingers i have the same noise !!!
Serge

The voice coil is rubbing.

Well then..., when you have it reconed (~$185 ), have them add the mass-ring and make it a 2235 if you really intend to use it as a subwoofer.

(Sometimes voice coil rub can be alleviated by turning the speaker to a different orientation.)

[sergelisses]

An where i can find a mass ring ?

Serge

[pos]

The mass ring is part of the 2235H recone kit (the only kit available for a 2231A recone).
Omitting the mass ring would turn it into a 2234H.