Page 3 of 13 FirstFirst 12345 ... LastLast
Results 31 to 45 of 190

Thread: 4345 monitor plans

  1. #31
    Senior Seņor boputnam's Avatar
    Join Date
    Apr 2003
    Location
    northern california
    Posts
    6,142
    Hey, Earl K...

    I was thinking this weekend about tossing one of the dwarfs (4301B's ) into the truck and seeing if they could match the baffle color. I don't think they're much computerized in these parts, but we'll see... Maybe Widget has the means?

    Whatever JBL used, there was almost indiscernable batch effects - that color is identical on my 4345's, 4313B's and 4301B's. Same-same-same with the grill cloths.
    bo

    "Indeed, not!!"

  2. #32
    Tom Loizeaux
    Guest
    Bo, Interesting photos. I enjoyed them.
    Are those original stock crossovers? The crossovers in my 4333s and 4343s are housed in a large metal box with terminal strips and point to point wiring, covered with a perforated metal screen. I'm surprized to see that yours are different.

    Tom

  3. #33
    Senior Seņor boputnam's Avatar
    Join Date
    Apr 2003
    Location
    northern california
    Posts
    6,142
    Hey, Tom...

    "Are those original stock crossovers?

    Near as I can tell. I had them mostly out, and partly dissassembled, yesterday for a member's (regrettably unrequited... ) request. There is no sign they are anything other than the Real McCoy.
    bo

    "Indeed, not!!"

  4. #34
    Senior Seņor boputnam's Avatar
    Join Date
    Apr 2003
    Location
    northern california
    Posts
    6,142
    Earl K...

    I remembered a "laugh" wrt your suggestion of getting "color consulting" done...

    Once time, I took a tired-old LE10A that someone had spilled something onto the face of, and went looking to try and match the old off-white Aquaplas face with some touch-up paint. This was the vintage LE10A with the fine, shiny white flecks of what look like maybe gypsum. Well, the HipHop boys manning the paint department were astounded by the size and weight of the motor, but were absolutely befuddled at, and insistant on changing, the white face. "It oughta be black, man - just not right..."

    They thought I was, well, at the least, bi...

    Ha!
    bo

    "Indeed, not!!"

  5. #35
    Senior Member
    Join Date
    Apr 2003
    Location
    Australia
    Posts
    7,939
    Bo,

    Regards the pics I'm impressed with your measurements.

    I have one question however which may help us Slot fanatics extract the last once of HF performance.

    Exactly how far proud does the lip of the 2405 Slot clear of the front baffle? It looks to be an 1/8 inch or so.

    This is a key measurement given the small wave lengths at the crossover point, and may also effect HF dispersion and imaging.

    regards

    macka
    Attached Images Attached Images  

  6. #36
    Senior Member
    Join Date
    Apr 2003
    Location
    GTA, Ont.
    Posts
    5,108

    Befuddled

    Bo, Yes, again , great effort at providing pics and measurements for the 4345. With all the other available information including crossover schematics, it should now be pretty straightforward to build up a pair ( but of course, not cheap ).


    befuddled at, and insistant on changing, the white face. "It oughta be black, man - just not right..."
    Well, I guess being the contrarian that I am, I prefer white cones for HiFi. (Helps keep me from getting confused & thinking that I'm listening to my black-faced SR gear - ).


    I bought a mint pair ( NIB ) of ancient le10a woofs that I refurbished the LansaLoy surrounds on. Alas, I got one small dot of brake fluid on that "gypsum" faced white cone. Stained it like the dickens - the size of a quarter.

    - Did the HipHop boys ever successfully match the off-white color( or get close ) ?
    - Or did they manage to send you into retreat mode ?

    regards <. Earl K

  7. #37
    Senior Seņor boputnam's Avatar
    Join Date
    Apr 2003
    Location
    northern california
    Posts
    6,142
    "Exactly how far proud does the lip of the 2405 Slot clear of the front baffle? It looks to be an 1/8 inch or so."
    Hey, Ian...

    Sorry, for the unfairly delayed reply - I'm "moving in" to a new EQ, and, well, er, you know...

    The distance from face of baffle to face of these 2405's is 25/100ths inch. I say these, because there are some slight modifications to the 2405's from this vintage to today's.

    On this vintage 2405 (16-ohm), the length of the "throat" is exactly 100/100ths inch. But, you can see in the attached from the current 2405 (8-ohm) brochure (JBL Pro 2405 Component Link) the throat is 1-1/16 inch.

    On the vintage 2405 (16-ohm) the mounting flange is also 25/100ths inch. I somewhere have a schematic for the vintage 2405, but it must be on my harddrive at work, and I won't be there 'til Thursday...

    Hope this helps
    Attached Images Attached Images  
    Last edited by boputnam; 08-03-2003 at 12:46 PM.
    bo

    "Indeed, not!!"

  8. #38
    Senior Seņor boputnam's Avatar
    Join Date
    Apr 2003
    Location
    northern california
    Posts
    6,142
    "Did the HipHop boys ever successfully match the off-white color( or get close ) ? "
    Hey, Earl K...

    Yea, they did. There's a kid here who has sniffed all sort of vaporous things and does a really good job matching paint.

    However, each white-boy cone is it's own unique shade. Over the years they fade differently, and are colored by their surroundings (or spills... ). So, I've got 4 half-quarts (smallest batch they would mix) for the 4 cones I matched - and I used like two dabs from each. Perfection, has its costs...

    But, what the heck were you doing with brake fluid on those LE10A's - some new hydraulic damping? Huh? COME ON, GIVE US YOUR SECRETS!!
    bo

    "Indeed, not!!"

  9. #39
    Senior Member
    Join Date
    Apr 2003
    Location
    Australia
    Posts
    7,939
    Hi Bo,

    Got you on those specifications.

    At the moment I'm drawing up a new " super baffle " for 4345 clone thanks to your assistance.

    It should look cool when I'm finished.

    Thanks again for your help.

    Cheers

    Ian

  10. #40
    Administrator Mr. Widget's Avatar
    Join Date
    Apr 2003
    Location
    San Francisco
    Posts
    9,715
    Bo, the brake fluid softens the old stiff lans-alloy surrounds.

    Earl, I would recommend that you air brush the stain. That way you won't add any more mass than is absolutely necessary. Start with an off white that is a close match and blend it in. If you can find an artist friend to do the work suggest they use designers gouache. It is very opaque and matte so very little would be required.

  11. #41
    Senior Seņor boputnam's Avatar
    Join Date
    Apr 2003
    Location
    northern california
    Posts
    6,142
    "brake fluid softens the old stiff lans-alloy surrounds."
    Well, that would save quite a bit of work. Every one I've come across has not only been "stiff", but cracked as well, so replacement was the only route...
    bo

    "Indeed, not!!"

  12. #42
    Tom Loizeaux
    Guest
    The 2405s in my 4333 and 4343 cabinets, when mounted from inside the cabinet using the rubber gasket ring, barely protrud and are basically flush with the front baffel with is 1" thick.

    Tom
    Last edited by Tom Loizeaux; 08-03-2003 at 05:57 PM.

  13. #43
    Senior Member
    Join Date
    Apr 2003
    Location
    GTA, Ont.
    Posts
    5,108

    Brake Fluid ?

    Hi All

    Thanks for the air-brushing advice Mr Widget.

    Bo, heck no, I haven't been holding out on this topic. Most of the chat on the topic "departed" with the implosions of all the previous forums. That's not really such a bad thing, because to successfully mess around with this technique, people must be able to do Fs measurements plus have a lot of patience. I thought you're posting of the pictorial step by step "refoaming a surround" was brilliant - BTW .
    This forum does contain a bit of my info on the "brake fluid thing" buried deep within a thread, called 2235 Break in Time .

    regards <. Earl K

  14. #44
    Senior Member GordonW's Avatar
    Join Date
    May 2003
    Location
    Marietta/Moultrie GA USA
    Posts
    1,455
    Originally posted by Mr. Widget
    Bo, the brake fluid softens the old stiff lans-alloy surrounds.

    Earl, I would recommend that you air brush the stain. That way you won't add any more mass than is absolutely necessary. Start with an off white that is a close match and blend it in. If you can find an artist friend to do the work suggest they use designers gouache. It is very opaque and matte so very little would be required.
    Have you tried plain old pure alcohol (the main solvent in brake fluid)? I've found alcohol to be able to dissolve/soften/de-gunk many of the old surround materials and glues, without screwing up the stuff you want to keep...

    Regards,
    Gordon.

  15. #45
    Senior Seņor boputnam's Avatar
    Join Date
    Apr 2003
    Location
    northern california
    Posts
    6,142
    Heck, Earl...

    I find that in participating on this forum, for the decades I was hefting pro-audio gear for my numerous efforts (and equal number of bands... ) at LIVE sound, while largely ignoring the home gear (or at the least, suffering through store-bought gear...) I learn a great deal from y'all who have done the obverse - spending decades of paying strict attention to all this. Your experiences are vast, and priceless.

    I only hope we don't lose this Forum, too. Don? Let us know when finances ar crimping the model. We're always ready...
    bo

    "Indeed, not!!"

Thread Information

Users Browsing this Thread

There are currently 1 users browsing this thread. (0 members and 1 guests)

Similar Threads

  1. 4343 VS 4345 network?
    By tv506 in forum Lansing Product Technical Help
    Replies: 21
    Last Post: 08-17-2011, 08:12 AM
  2. NEW 1.5 inch horn for 4345 / 4343
    By subwoof in forum Lansing Product DIY Forum
    Replies: 114
    Last Post: 07-23-2008, 05:47 AM
  3. Ian's (& Bo's) 4345 project
    By Ian Mackenzie in forum Lansing Product DIY Forum
    Replies: 176
    Last Post: 08-31-2007, 06:24 PM
  4. 4345 Foilcal
    By Guido in forum Lansing Product General Information
    Replies: 8
    Last Post: 01-05-2005, 01:49 PM
  5. 4345 Crossover with an 8 ohm Compression driver???
    By Robh3606 in forum Lansing Product Technical Help
    Replies: 3
    Last Post: 06-17-2003, 06:32 PM

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •