Results 1 to 3 of 3

Thread: Reviving my old 4341's !!

  1. #1
    Junior Member
    Join Date
    Jun 2014
    Location
    montreal
    Posts
    6

    Reviving my old 4341's !!

    I have a pair of JBL 4341's from the seventies that I am in the process of reviving, and I have a question

    I brought the 15's to get new foam surrounds in that they were completely gone and the tech told me that the spiders were weak??

    He explained that the spider should better support the cone and that if changed, that the speakers would support more power before bottoming out.

    Is this really necessary in that the cabs are only rated at 75 watts to begin with? Will I be losing sensitivity??

    speakers are 2235A's I think

    thanks

    btw: AT the moment, I have another pair of 15's in the cabs and everything seems to work fine

  2. #2
    Senior Member ivica's Avatar
    Join Date
    Jan 2008
    Location
    serbia
    Posts
    1,703
    Quote Originally Posted by rjw View Post
    I have a pair of JBL 4341's from the seventies that I am in the process of reviving, and I have a question

    I brought the 15's to get new foam surrounds in that they were completely gone and the tech told me that the spiders were weak??

    He explained that the spider should better support the cone and that if changed, that the speakers would support more power before bottoming out.

    Is this really necessary in that the cabs are only rated at 75 watts to begin with? Will I be losing sensitivity??

    speakers are 2235A's I think

    thanks

    btw: AT the moment, I have another pair of 15's in the cabs and everything seems to work fine
    Hi rjw,


    From the explanation in the:

    http://www.jblpro.com/pub/obsolete/4340_4341.pdf

    it seems to me that the Bass driver is 2231A (Alnico), not 2235H (ferrite) so rated power has not to be over-passed, in order to protect the 2231A from being demagnetized. Owing to 2231A large Vas, it would be expected that it has quite soft spider, so I can suggest You only to bay 2231A appropriated (re)-foam and apply to 2231A. Here on the forum, You can seen that a lot of members are very satisfied with the Rick's Cobb [ e-maiL: [email protected] ] foams for the 2231A/2235H.
    I think that reaching Fs=16Hz will never can be get , but around 20~24Hz can be expected (after "burn-in"-after some time of use) .

    Regards
    ivica

  3. #3
    Junior Member
    Join Date
    Jun 2014
    Location
    montreal
    Posts
    6
    Should have them back in a few days. 2231A's = Yes

    Meantime, I have another set of 15's in the cabs temporarily and the good news is that everything else seem to work fine!! Amazing, in that they sat unused since the early 80's.

    I am curious as to what they would be worth?

Thread Information

Users Browsing this Thread

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

Similar Threads

  1. My new 4341's have arrived...
    By MickeyFinn in forum Lansing Product General Information
    Replies: 14
    Last Post: 05-25-2014, 02:00 AM
  2. Reviving old midbass transducers
    By Fangio in forum Lansing Product DIY Forum
    Replies: 15
    Last Post: 11-06-2007, 06:25 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
  •