O ring gaskets missing

[Kay Pirinha]

Hi,

today I received a pair of used and reconed 2225H's to build two subwoofers. Unfortunately the O ring gaskets are missing, and without them I can't front mount them. How can I replace these gaskets?

Best regards!

[richluvsound]

Neoprene adhesive tape

[1audiohack]

Hello;

The O Rings are hollow tubes that are melted or bonded end to end to form a ring. This material is available for gasket making as is solid round.

Solid round O rings are not sufficiently compliant for mounting speakers in wood.

I will cross section measure one for you if it will help you find some suitable material.

Barry.

[Kay Pirinha]

Fine, Barry! Thanks in advance :applaud:!

Best regards!

[Robh3606]

You could also use a paper gaskets as well

Rob:)

[Kay Pirinha]

Yes, but I think it's rather difficult to make :dont-know:.

Best regards!

[1audiohack]

The tube I have from JBL kits measures:
2.75mm outer diameter.
1.25mm inside diameter.

It is easily melted or bonded together with instant adhesive. Melted is stronger and remains flexible. Use a hot surface rather than flame.

Barry.

[Kay Pirinha]

Thanks, I'll have a look :applaud:! The circumference can be calculated by the cutout diameter from the datasheets multiplied by Pi, I think?

Best regards!

[sguttag]

Gasket 34499 remains a service part from JBL. If you have a local JBL parts importer, they should be able to source it for you. They are not that pricey.

[Kay Pirinha]

Thanks also to you! I just contacted the German importer, hoping to get an answer soon.

Best regards!

[Robh3606]

Yes, but I think it's rather difficult to make :dont-know:.

No you can purchase them JBL makes paper gaskets for 8-18" drivers that you used to be able to purchase. Any re-coning shop should also have them.

Rob:)

[Kay Pirinha]

Ok, so the gasket 34499 appears to be unavailable here in Germany. I'll go and ask for paper gaskets. Or I'll search for foam coards that I could glue to form O rings.

Best regards!

[badman]

Thin weatherseal foam tape works just fine too.

[Kay Pirinha]

As it has to be applied in a conical shape, will it stick sufficiently? But soon I'll try by myself ;). Today I've fetched the enclosure panels, and after our vacancies, i.e. in about four weeks, I'll build the subwoofers.

Best regards!

[badman]

As it has to be applied in a conical shape, will it stick sufficiently? But soon I'll try by myself ;). Today I've fetched the enclosure panels, and after our vacancies, i.e. in about four weeks, I'll build the subwoofers.

Best regards!


Sorry, conical? It should be a flat ring shape?

[RMC]

To badman re post # 15: my understanding is that a round tube made gasket (see Barry's posts) will give a flat ring shape when compressed in place.

Hi Kay,

You're right the circumference of a circle is Pi X diameter.

I still have my original paper/cardboard 2214H gaskets, with pre-made holes, from 1991 and never used them, stored in a bag ever since. A manufacturer's insult to speaker builders in my view, low cost being King I guess. I wouldn't purchase any paper/cardboard gaskets if I were you. If someone wants these "gaskets" they're yours for the asking.

A good gasket should be compliant, have some compression (i.e. "spongy") to prevent or seal any air leak. The 2214 gaskets sure don't meet the criteria at all since they're rigid with no compression whatsoever, more like a thin molding than a gasket...

The gaskets I use are either some kind of foam type or rubber, plus compliant with compression.

I keep numerous gasket sizes in stock, accumulated over the years and store them in plastic bags so they don't dry. Unfortunately no 15" or more left... but still have many about any size from tweeter to 12"+ or so.

If need be I also make some from small compliant, empty inside, rubber like tubing I have and bond the ends with instant adhesive as mentioned by Barry and never had an issue yet on smaller drivers.

I agree with badman, weather stripping tape, which comes in various widths and thickness, is probably another best friend in the absence of real gaskets. I also keep various sizes of this adhesive tape on-hand.

For some unknown reason getting good speaker gaskets, an elementary requirement, has been difficult for some time (at least here), hence my accumulation of these whenever I see something acceptable.

The latest European woofers I purchased (Fane Acoustics and SB Acoustics) did come with rubber or foam gaskets respectively pre-installed. Regards,

Richard

P.S. In case you need more ideas on material type used I could post picture(s), let me know.

[Kay Pirinha]

Yes, exactly this is what makes me wonder how I would apply the suggested self-stickung foam tape to the basket. It comes off a roll and is straight. Is it suggested to cut the tape multiple times and bend it to a semi circular shape?

Best regards!

[badman]

Yes, exactly this is what makes me wonder how I would apply the suggested self-stickung foam tape to the basket. It comes off a roll and is straight. Is it suggested to cut the tape multiple times and bend it to a semi circular shape?

Best regards!

Because it's a highly compliant material and will be clamped between rigid surfaces, a little bunching as it's shaped into the circle isn't a big deal. You want to use the lower-density stuff, not thick heavy stuff which might cause issues going round that way.

[Kay Pirinha]

That means you would stick it to the basket's flat frame?

Best regards!

[badman]

Generally I put the gasket on the cabinet, but it can work fine either way.