Results 1 to 9 of 9

Thread: 4345 tweeters not working

  1. #1
    Senior Member 4345's Avatar
    Join Date
    May 2003
    Location
    Florida
    Posts
    220

    4345 tweeters not working

    I have not listened to my 4345’s in quite a while. I bought some new electronics ( NAD 375BEE NAD CD PLAYER) and wanted to use them again. I noticed the speakers sounded bad. Both 2405’s were not working. I tried turning the potentiometers back and forth many times, but that did not work. What next? I will check the tweeters outside the crossovers first. If it is a crossover issue, would now be a good time to upgrade some parts? I’m not a technical expert. Any advice would be appreciated.

  2. #2
    Senior Member
    Join Date
    Apr 2003
    Location
    Australia
    Posts
    7,942
    It might be the Lpads need cleaning or replacing

    Get a technician to look at your slots if the above does not fix the issue

  3. #3
    Senior Member 4345's Avatar
    Join Date
    May 2003
    Location
    Florida
    Posts
    220
    Thanks. I was reading other threads on the site. Probably, should have done that before posting anyway. I am going to buy some DeOxit cleaner to spray the L-Pads. I hope this makes sense. I spent an hour reading what type of DeOxit to use and think it might be the D5 or D100, or either one. My attitude is to always try and do the simple things first.

  4. #4
    Senior Member 4345's Avatar
    Join Date
    May 2003
    Location
    Florida
    Posts
    220

    Problem Solved for now.

    The L-Pads are sealed. So, spraying them with DeOxit was not possible. I did notice when I jiggled the wiring harness the slots and 2421's started working. I then decided to unplug the wires where they connect to the crossover. I really did not have to unplug them entirely, I just moved them in and out a few times. I think this made the connection better and they worked great. I then sprayed a bit of DeOxit on the connection. I waited about 12 hours and turned them on. They sound great. I am not sure I have heard them sound so good.
    Attached Images Attached Images      

  5. #5
    Senior Member
    Join Date
    Jan 2005
    Location
    Detroit
    Posts
    391
    Quote Originally Posted by 4345 View Post
    The L-Pads are sealed. So, spraying them with DeOxit was not possible. I did notice when I jiggled the wiring harness the slots and 2421's started working. I then decided to unplug the wires where they connect to the crossover. I really did not have to unplug them entirely, I just moved them in and out a few times. I think this made the connection better and they worked great. I then sprayed a bit of DeOxit on the connection. I waited about 12 hours and turned them on. They sound great. I am not sure I have heard them sound so good.
    Good show! As far as the L-pads are concerned, the only way I have ever been able to successfully clean those is to take them apart (bend the tabs, etc.) and apply the deoxit directly on the coils and wipers. Not exactly easy - pretty much have to pull the whole L-pad assembly out of the cabinets. I have my crossover sitting on top of the enclosures which solves that problem (DIY rig). But, connections are the bane of old electronics and you are becoming an expert (whether you like it or not). Mike

  6. #6
    Junior Member ssrobw's Avatar
    Join Date
    Sep 2013
    Location
    Kansas City Missouri
    Posts
    15
    I'd really appreciate any and all advice for the same issue. I'm very lucky as I purchased my 4345s still sealed new in their boxes a few years back. I'll sometimes hear a faint bit of tweeter from the right speaker on very well recorded music, Eagles Farewell DVD and LP, but never a peep from the left and minimal from right slot. Today, after several years, I managed the nerve to Bi-amp them hoping this might bring them to life. Sadly it did not. BUT WOW! These monsters image so much better.

  7. #7
    Senior Member
    Join Date
    Apr 2003
    Location
    Australia
    Posts
    7,942
    The poster above was good advice

    If you are confident of removing the woofers you can access the crossover network

    The problem could be the connectors need removing and re connection to the board due to oxidised contacts.



    Go here for guidance

    http://www.audioheritage.org/vbullet...ial&highlight=

    http://www.audioheritage.org/vbullet...l=1#post142747

  8. #8
    Senior Member BMWCCA's Avatar
    Join Date
    Feb 2006
    Location
    Virginia
    Posts
    7,743
    You're in Florida—it isn't the heat, it's the humidity!

    Check and undo and re-do every connection you can. It is often helpful to play the system at ridiculous volume to knock an old ring-radiator loose.

    And there's always the trick of using a paper-towel tube between your ear and the driver output to make sure it's working, or not.

    This will also require posting the story of how you happened upon a new in-the-box pair of a monitor JBL made only about 200 of in the first place, decades ago . . .

    ". . . as you have no doubt noticed, no one told the 4345 that it can't work correctly so it does anyway."—Greg Timbers

  9. #9
    Senior Member
    Join Date
    Apr 2003
    Location
    Australia
    Posts
    7,942
    It was wondering about that!

Thread Information

Users Browsing this Thread

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

Similar Threads

  1. Help LX-10 Crossover Not Working Right
    By gsb001 in forum Lansing Product Technical Help
    Replies: 0
    Last Post: 08-13-2010, 10:07 PM
  2. Links not working
    By rdgrimes in forum Forum Feedback
    Replies: 1
    Last Post: 01-25-2010, 07:02 AM
  3. need tweeters working or not condition doesnt matter
    By angel mercado in forum Lansing Product General Information
    Replies: 9
    Last Post: 01-08-2004, 10:27 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
  •