Guest utente Posted March 16, 2007 Report Share Posted March 16, 2007 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 Link to comment Share on other sites More sharing options...
Carlspeak Posted March 16, 2007 Report Share Posted March 16, 2007 >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 musicCarlCarl's Custom Loudspeakers Link to comment Share on other sites More sharing options...
Guest utente Posted March 16, 2007 Report Share Posted March 16, 2007 So, the foam is glued to the underside of both the cone and the masonite.thanks Carl-- Steven Link to comment Share on other sites More sharing options...
Carlspeak Posted March 17, 2007 Report Share Posted March 17, 2007 >So, the foam is glued to the underside of both the cone and>the masonite.YES!!It's all about the musicCarlCarl's Custom Loudspeakers Link to comment Share on other sites More sharing options...
Doug G. Posted March 17, 2007 Report Share Posted March 17, 2007 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 Link to comment Share on other sites More sharing options...
dynaco_dan Posted March 18, 2007 Report Share Posted March 18, 2007 >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. Link to comment Share on other sites More sharing options...
Pete B Posted March 18, 2007 Report Share Posted March 18, 2007 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=searchhttp://www.classicspeakerpages.net/dc/dcbo...type=search#489I'd like to suggest that we have some "sticky aka pinned" threads here, a few suggestions:Refoaming the LA woofersCrossover Schematics and component valuesThe LA WoofersThe LA TweetersHow to Rebuild the LAPete 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 Link to comment Share on other sites More sharing options...
Carlspeak Posted March 18, 2007 Report Share Posted March 18, 2007 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 allIt's all about the musicCarlCarl's Custom Loudspeakers Link to comment Share on other sites More sharing options...
Guest utente Posted March 19, 2007 Report Share Posted March 19, 2007 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 Link to comment Share on other sites More sharing options...
Pete B Posted March 19, 2007 Report Share Posted March 19, 2007 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>> Link to comment Share on other sites More sharing options...
Guest utente Posted March 19, 2007 Report Share Posted March 19, 2007 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 Link to comment Share on other sites More sharing options...
Doug G. Posted March 20, 2007 Report Share Posted March 20, 2007 Groovy! Now get those done before anything changes and so you can listen to them again! :^)Top = Front when facing speaker.Doug Link to comment Share on other sites More sharing options...
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