2235 subwoofer, instead of 2245

Printable View

10-08-2003, 06:43 AM
Niklas Nord

2235 subwoofer, instead of 2245

I have been thinking about some subwoofers.. And i think i
will save my 18" drivers untill i move to a house..

I may use the 2235H, was there a mass ring that lowered the
FS on the 2235 to 17HZ ? What are the parameters for that driver, and what is the cone kit called?

any suggestions regarding a cabinet for this one? it will be
filtered to operate below 60- 80hz to my K2 s9500

I tend to build corner placed boxes, x 4

and i guess the tuning freq would be the same as FS for the driver..

What would be the ultimate box volume and tuning and filling with an 2235 driver ?

to go as low as possible, and no more than 280 liters..
10-08-2003, 07:04 AM
boputnam

Hey, Niklas... :wave:

You might use the Search button - there's been quite a few threads or portions thereof, discussing the 2235H, mass-rings, etc. You may have to "mouse" around a bit ;) , but much of what you seek is out there.

There's quite a few fans of the 2235H, and their merits vs the 18-in transducers (2245H, say), are bandied about.

If you want hardcopy, follow the excellent advice of MJ Bing on the Printing...? - Link
10-08-2003, 07:10 AM
boputnam

Re: 2235 subwoofer, instead of 2245

Quote:

Originally posted by Niklas Nord
what is the cone kit called?

C8R2235 $118.00 for the 2230A, 2231A, 2231H, 2234H, 2235H
10-08-2003, 07:14 AM
Niklas Nord

Okay!

I have 2235 and 4 empty baskets to recone to 2235, thats 6 drivers..

aha, but in the corners there will be some gain that i´m very interested in..

okey, please check that
10-08-2003, 07:17 AM
boputnam

Giskard was here, a minute ago...
10-08-2003, 12:29 PM
Niklas Nord

Hello

What would YOU do?
Would the 95 grams ring make fast detailed bass?
Well, its under 70hz so... not so fast anymore..

What would you do with regular 2235

What would you do with 2235 95grams

does this need any kind of linkwitz filter?

do i have to filter out the lowest band?
10-08-2003, 12:59 PM
Niklas Nord

so i can go with an sealed enclousue and still get some big bang in the room
10-09-2003, 12:59 AM
Niklas Nord

So the 95grams massring can be obtained separately?

Can i remove the dustcap on my 2235 and put in the 95 grams ring then? And then glue the cap back on?

Maybe the best thing for me would be to use regular 2235 drivers whitout the 90grams ring.. becouse i dont know if i will use them for anything else in the future...
10-09-2003, 06:44 AM
boputnam

Quote:

Originally posted by Giskard
To lower the Fs you would need to use the 56945 mass ring from the 121A/121H (~ 95 grams).

So, how tricky is this? What's the best method for removal, and then I presume this gluing is not a job for Bostex?

Oh - and superb session, Giskard. :yes: To the front of the class! :thmbsup:
10-09-2003, 08:41 AM
Niklas Nord

I wont use anything else than JBL
10-09-2003, 10:00 AM
JonFairhurst

Adding a mass ring is pretty easy. Removing one might be another story.

Last year I bought some used 2235s that turned out to be 2234s. No prob. Señor Giskard was able to provide mass rings, dust caps and bostik. All I needed was an exacto knife, paint brush, black model paint and a steady hand.

The mass ring is formed with a small lip that fits inside of the voice coil structure. I installed mine by applying bostik glue to this area, and sliding the ring carefully into the structure. The top part of the ring (consider the orientation with the speaker magnet resting on a table, cone pointing upwards) is thicker, and keeps the ring from sliding into the voice coil.

The overall steps for installation are:
1) cut away the dust cap - carefully!
2) install the ring with bostik
3) glue a new dust cap on
4) paint the glue black

But removal of an old ring? Hmm. To dremel it away would make a mess in the all-important gap. To use a bostik-dissolver (nail polish remover?) would likely dissolve more than just the bostik. To pry or cut it away from the coil would likely damage the coil.

Maybe somebody here has found a good removal trick.

The other method would be to simply glue the new ring on top of the old one. The tuning frequency would be even l-o-w-e-r. Just hope that the dust cover clears it and that the ring is totally secure.

Good luck with your project. Four sealed 2236s should be unbelievably tight and l-o-w.
10-09-2003, 10:37 AM
boputnam

1 Attachment(s)

Quote:

Originally posted by JonFairhurst
...(consider the orientation with the speaker magnet resting on a table, cone pointing upwards)...

Attached photo, as posted by Giskard, so many months ago...

Thanks, Jon. Excellent explanation!

And, the removal task not showing many takers... :hmm:
10-09-2003, 10:56 AM
JonFairhurst

A pixel's worth a kiloword. Great photo Bob!

Looking at the photo has reconnected some of my long-forgotten neurons. I would definitely recommend adding the new mass ring to the old one.

Note that the ring is split in order to allow for some tolerance in the diameter of the voice coil. By enlarging the split (if needed), one could easily slide the new ring inside of the old one. And it would present enough surface area to make a good connection.

Subwoofers ho!