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Just checking before I glue the new foam surrounds


Guest utente

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Guest utente

I want to check on the correct positioning of a foam surround. I think that I have it right, but want to check first.

1. The roll is toward the outside (i.e., convex), not toward the inside (concave) ?

2. The foam is glued to the underside of the masonite ?

3. The foam is glued to the top (not the underside) of the cone ?

The original foam is completely gone, so I can't judge from that.

thanks,

Steven

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>I want to check on the correct positioning of a foam

>surround. I think that I have it right, but want to check

>first.

>

>1. The roll is toward the outside (i.e., convex), not toward

>the inside (concave) ?

If you have woofers with masonite rings as you indicate below, the roll is concave (toward the inside of the speaker)

>

>2. The foam is glued to the underside of the masonite ?

Yes, but do that last.

>

>3. The foam is glued to the top (not the underside) of the

>cone ?

The foam is glued to the underside of the cone. Do that first and let it dry before gluing to the masonite ring.

I suggest shimming the vc to center it before gluing to the masonite ring. Others may say not to. But shimming is a full proof way to get the vc centered in the air gap.

It's all about the music

Carl

Carl's Custom Loudspeakers

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Nope. Sorry. The surround on a masonite woofer is glued to the TOP of the cone and the bottom of the masonite ring.

The surround is glued to the bottom of the cone and top of the frame on the all-metal woofers.

This is not debateable. :^)

Doug

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>Nope. Sorry. The surround on a masonite woofer is glued to

>the TOP of the cone and the bottom of the masonite ring.

>

>The surround is glued to the bottom of the cone and top of the

>frame on the all-metal woofers.

>

>This is not debateable. :^)

>

>Doug

>

Hi Doug;

I just looked at 3 that I have sitting here, they have the surround on the inside or top of the cone.

It may be possible that there was some set on the outside of the cone.

I am not an expert but I see not much difference in just the thickness of the cone material.

Because I have not done a Larger Advent woofer yet, I am not saying it is ok.

I have seen on ebay where a person inverted the cone even and glued it on top of the masonite.

This would make it 1/4"+/- shy of rearward movement already without any signal.

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I have 6 Masonite LA Woofers here, all were original as far as I can tell, and all have the foam glued to the front of the cone, back of the Masonite, roll in, as Doug describes.

I also have 4 metal frame LA Woofers, where the foam is glued to the back of the cone, front of the metal, roll out, also as Doug describes.

I have a few more comments in these threads:

http://www.classicspeakerpages.net/dc/dcbo...ing_type=search

http://www.classicspeakerpages.net/dc/dcbo...type=search#489

I'd like to suggest that we have some "sticky aka pinned" threads here, a few suggestions:

Refoaming the LA woofers

Crossover Schematics and component values

The LA Woofers

The LA Tweeters

How to Rebuild the LA

Pete B.

>Nope. Sorry. The surround on a masonite woofer is glued to

>the TOP of the cone and the bottom of the masonite ring.

>

>The surround is glued to the bottom of the cone and top of the

>frame on the all-metal woofers.

>

>This is not debateable. :^)

>

>Doug

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Thanks Vern and Doug. I didn't have any in my possession and was advising from memory. Guess I won't try to tax my ageing memory like that again when giving advice.

Cheers all

It's all about the music

Carl

Carl's Custom Loudspeakers

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Guest utente

Ok, let's see if I have this straight. Good thing that I waited to hear guys who have done this before. I've waited too long to refoam these-- years, actually-- to rush in and botch this job!

These speakers were part of my first real stereo system, along with a Marantz 2245 and a Lenco turntable. The Advents and the 2245 have been sitting in my ex-wife's living room, unused because of the deteriorated surrounds. I finally asked for them and the Marantz and she said yes. I should have asked when we first separated. She has no emotional (or acustic) attachment to them, anyway.

1. Surround is installed concave (with the roll facing toward the magnet)

2. It's glued to the bottom of the masonite.

3. It's glued to the top of the cone. The "top" is the same as "inside".

4. Glue it to the cone first, then to the masonite.

thanks to all of you.

--Steven

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Number 3 is wrong, it is glued to the front of the cone, the side you would see when it is normally mounted in the cabinet when you take the grill off. Look at your old woofers, you will probably see glue and signs of the old foam there.

Actually, I'm not sure what you mean by top or inside of the cone.

Inside is what seems wrong, do you mean the side facing inside the speaker?

It would be the top, if you place the woofer on a table, with the cone up, magnet down, then yes it is glued to the "top" of the cone.

The rest are correct.

Pete B.

>Ok, let's see if I have this straight. Good thing that I

>waited to hear guys who have done this before. I've waited

>too long to refoam these-- years, actually-- to rush in and

>botch this job!

>

>These speakers were part of my first real stereo system, along

>with a Marantz 2245 and a Lenco turntable. The Advents and

>the 2245 have been sitting in my ex-wife's living room,

>unused because of the deteriorated surrounds. I finally asked

>for them and the Marantz and she said yes. I should have

>asked when we first separated. She has no emotional (or

>acustic) attachment to them, anyway.

>

>1. Surround is installed concave (with the roll facing toward

>the magnet)

>

>2. It's glued to the bottom of the masonite.

>

>3. It's glued to the top of the cone. The "top" is

>the same as "inside".

>

>4. Glue it to the cone first, then to the masonite.

>

>thanks to all of you.

>

>--Steven

>

>

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Guest utente

Thanks, Pete-

the nomenclature is a little confusing, but that's what I thought: top, meaning the edge that is facing you when you're looking at the speaker in the cabinet.

--Steven

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