Birger Posted January 17, 2016 Report Share Posted January 17, 2016 Hello again from a cold ( -9,4 F) SwedenAbout My LST´sWoofer are at re foaming. Crossovers are rebuilt with new CapsNow to my questionWhen I bought them , the pre owner hade replaced the original woofers with some very cheep 12 inch lowFi ones, and even two of the tweeters gone.I managed to find a pair of AR 3a imp. with the replacement woofers ( as mentioned in my earlier question ) and both mids and tweeters OK.Now, as I have re caped the crossover, I´m a little confused about the " stuffing ".Probably even that is NOT the original .It´s some kind of yellow fiberglass ( I think)So, what kind of " stuffing " and how much in every speaker is my question.Can I use the type of " stuffing " sold at loudspeakers shop´s ? or what do You recommend ??Thanks so far BirgerP.S. still wondering why straps over the two 20 uf caps are cut ??before after stuffing Link to comment Share on other sites More sharing options...
Carlspeak Posted January 17, 2016 Report Share Posted January 17, 2016 AR did use yellow fiberglass for a period of time. Are you sure it is not original? Link to comment Share on other sites More sharing options...
Birger Posted January 17, 2016 Author Report Share Posted January 17, 2016 HiThat´s why I asked.Even so There was more in one of them.So, still asking about how much in every speaker ?Regards Birger Link to comment Share on other sites More sharing options...
Carlspeak Posted January 17, 2016 Report Share Posted January 17, 2016 Do a rough calculation of the internal volume of the cabinet and stuff at a rate of 1 lb/cu. ft. Link to comment Share on other sites More sharing options...
Birger Posted January 17, 2016 Author Report Share Posted January 17, 2016 Hi againThanx .I´ll give it a try.Birger Link to comment Share on other sites More sharing options...
ra.ra Posted January 17, 2016 Report Share Posted January 17, 2016 Hi Birger, just a couple thoughts here.Since one cabinet contained noticeably more stuffing than the other one, and woofers had already been replaced, it is obvious that someone was inside these speakers before. This may also explain the snipped straps, too - - quite possibly, previous owner had the good intention of replacing some components and simply gave up at a very early stage. And perhaps the stuffing was then replaced carelessly.Per AR's literature, the LST shares the same cabinet volume as the AR-3a, so you may just want to follow the recommendations in the AR-3a restoration manual regarding cabinet fill. Not sure of the exact original material density, but the fiberglass fill that Carl refers to is essentially thermal insulation used for building construction, available at local home supply stores, presumably in Sweden as well. Link to comment Share on other sites More sharing options...
frankmarsi Posted January 17, 2016 Report Share Posted January 17, 2016 Hey fellas, there's a nice pair on the bay rite now going for $4,000, plus another pair at $2,000.plus $300. for shipping.Screw the good feeling of 'DIY", go to the bank and take out a loan, or hit your credit cards.Are they worth it, you bet they are but, four big ones does sound a little steep.Last week or so, Larry sold a pair he re-did, for $3,800.There's also a set of LST 2's on the bay. There's also a badly repainted pair of AR-9s in Georgia on sale for cheap, $450.In terms of construction, you'd have to be a qualified wood-worker to build the cabinet, with that in mind, look into the M.L. Amati's asthey may have been constructed better with more interior bracing.And not to be discouraging, there is also the driver question.If one was to go that far to build the cabinets, you'd want to use new good quality speakers in them too as older drivers are becoming more difficult to find.Then there's the calculating and building of the X-overs and such.Lastly, the need for a high power amplifier cause they just don't perform with low power no matter want some folks think.I think "steveF' had it correct in another post about 'DIY', it's easier thought of than done.fm Link to comment Share on other sites More sharing options...
Birger Posted January 22, 2016 Author Report Share Posted January 22, 2016 Hi all thoughts about re glue the tweetersIs it possible to ( before it is to late ) re glue the three points ( maybe three new points between the original ones ) ??Any one any thoughts??Can I use normal glue, ore can I use " hot " glue ??Otherwise the LST´s are now playing again .Thankx , and a nice weekend to all of YouRegards Birger Link to comment Share on other sites More sharing options...
RoyC Posted January 22, 2016 Report Share Posted January 22, 2016 Hi all thoughts about re glue the tweetersIs it possible to ( before it is to late ) re glue the three points ( maybe three new points between the original ones ) ??Any one any thoughts??Can I use normal glue, ore can I use " hot " glue ??Otherwise the LST´s are now playing again .Thankx , and a nice weekend to all of YouRegards BirgerThose "3 points" are not made of glue! They are a foam material which comprises the suspension of the dome. If you put glue over them or put glue over other areas of the voice coil gap, the dome will cease to move and the tweeter will be ruined.Roy Link to comment Share on other sites More sharing options...
Birger Posted January 22, 2016 Author Report Share Posted January 22, 2016 Thanks for the answer RoyEvery day You learn something new.So, any suggestions about what to do to save the tweeters from falling apart ? ( I think that will happen sooner or later , ore am I wrong ) ??Thanks againBirger Link to comment Share on other sites More sharing options...
RoyC Posted January 23, 2016 Report Share Posted January 23, 2016 Thanks for the answer RoyEvery day You learn something new.So, any suggestions about what to do to save the tweeters from falling apart ? ( I think that will happen sooner or later , ore am I wrong ) ??Thanks againBirgerThere really isn't anything you can do about it.Roy Link to comment Share on other sites More sharing options...
Birger Posted January 23, 2016 Author Report Share Posted January 23, 2016 Hello and good morning RoyOK, that´s a little sad.So, I´ll see over time.Thank You all for help and tips.Birger Link to comment Share on other sites More sharing options...
Birger Posted January 24, 2016 Author Report Share Posted January 24, 2016 P.S. One last questionIs it possible to find out if they are from the early ore late period ( Info on the back is missing )Birger Link to comment Share on other sites More sharing options...
KlausDK Posted February 4, 2016 Report Share Posted February 4, 2016 Any date stamps on the original drivers (midrange and tweeters)? ity is typically printed like "week and year" Do they open from the back/do they have a a built in fuseholder? (it looks like a no to both questions). Given also the position of the transformator, my guess would be that they are late productions, but a date would help a lot BRgds Klaus Link to comment Share on other sites More sharing options...
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