Page 1 of 2 12 LastLast
Results 1 to 15 of 26

Thread: L 110 woofer issues

Hybrid View

Previous Post Previous Post   Next Post Next Post
  1. #1
    Junior Member
    Join Date
    Aug 2015
    Location
    Louisiana
    Posts
    7

    L 110 woofer issues

    I have had a pair of L 110 since 1983 and they have performed flawless until now apart from refoaming the woofers three years ago, after that they worked well again.
    Now the woofers have stopped working or rather they don't move, I seem to feel some vibration but not enough to make them move no matter how much power I add.
    I've tried to measure all the components in the crossover, the only abnormality are the inductors which seems to show less readings than I have read they should.

    Pretty new at trying to troubleshoot, any advise would be more than welcome.

    Carsten

  2. #2
    Senior Member Don C's Avatar
    Join Date
    Apr 2003
    Location
    Santa Rosa CA
    Posts
    1,722
    The voice coil must be stuck in the gap. Due to mis-alignment, foreign material, failed adhesive, or overheating. Surprisingly, it looks like official kits are still available. So you could have a professional recone job done.

    Name:  plist.jpg
Views: 884
Size:  155.9 KB

  3. #3
    Junior Member
    Join Date
    Aug 2015
    Location
    Louisiana
    Posts
    7

    Clarification to the above

    Thanks for your reply Don

    I can now see that I need to clarify what I meant with them not moving.
    The woofers actually move freely without any noise or resistance when moving them manually, but when playing they do not move as they used to do, i.e. no visible movement of speaker cone.

    Hence my suggestion that it may be the inductors.

    regards

    Carsten

  4. #4
    Senior Member Don C's Avatar
    Join Date
    Apr 2003
    Location
    Santa Rosa CA
    Posts
    1,722
    Oh. Can you hear sound coming from them? If not, in this situation, you should get a multimeter and check the continuity of the voice coil.

  5. #5
    Junior Member
    Join Date
    Aug 2015
    Location
    Louisiana
    Posts
    7

    Test results

    Hi again Don

    There're sound coming from both woofers.

    Also we tried to measure both woofers, they read between 5.2 and 5.3 ohms which I think is within the normal range.

    So that seems to be ok?

    regards

    Carsten

  6. #6
    Junior Member
    Join Date
    Aug 2015
    Location
    Louisiana
    Posts
    7

    problem solved

    After having swopped out the capacitors for the woofers and added the missing 0.0068 mF parallel capacitor, we checked the speakers again, same result.

    Dug out an old amp and hooked it up, guess the problem all the time was the amp my son uses! Must have blown a circuit or something, wish I had thought about checking that first.

    Anyway, we have new capacitors in the x-over and working speakers, not bad at all.

    Thanks so much for your help and advise

    Btw, the schematics for the L110A shows parallel 0.0068 mF capacitors for all components, do they make a lot of difference? They're missing on both x-overs, guess they were removed during a repairs years ago. We added them for the woofers but not for the midrange and the tweeters.

  7. #7
    Senior Member Don C's Avatar
    Join Date
    Apr 2003
    Location
    Santa Rosa CA
    Posts
    1,722
    They are called bypass capacitors. There's endless discussion about them in various threads here. They are probably worth adding if you care about good sound.

  8. #8
    Obsolete
    Join Date
    Apr 2003
    Location
    NLA
    Posts
    12,193
    Quote Originally Posted by Don C View Post
    They are called bypass capacitors. There's endless discussion about them in various threads here. They are probably worth adding if you care about good sound.
    Yeah, for what it's worth:

    Bypassed and Biased Capacitors

  9. #9
    Senior Member
    Join Date
    May 2009
    Location
    California
    Posts
    1,587
    Quote Originally Posted by 4313B View Post
    Yeah, for what it's worth:

    Bypassed and Biased Capacitors
    I wish you would please share with me what you did not like about the Dayton film and foils for by-pass use

    I have read where you wrote that it was "not nice", but I was extremely interested in knowing just how so (YOUR impressions, exactly what did you not like about them)

    I sent you several PMs and no reply; am I on your shit list?

    Sorry for the hijack Louisiana; glad y'all got your problem straightened out

    Thanks
    Thomas

  10. #10
    Senior Member
    Join Date
    Apr 2010
    Location
    New London, WI
    Posts
    163
    Just recently I bought a 112H that had failing tinsel leads that resulted in erratic behavior, sometimes it worked... I was actually able to excavate the old tinsel & put in some fresh stuff to salvage the speaker.
    Tinsel seems to be made of something other than just metal so it doesn't have to appear physically broken for it not to work right. You might want to carefully play with the tinsel leads while running an amp directly to the woofer to see if there is any issue them.

    Also, Deoxit is the vintage electronics owners friend. Spritz some of that in the high & mid level pots & on slip on connections and wiggle them gently.

  11. #11
    Senior Member Don C's Avatar
    Join Date
    Apr 2003
    Location
    Santa Rosa CA
    Posts
    1,722
    If there is sound, how does it sound? If it sounds OK, I wouldn't worry that the woofers don't move much. Check every speaker by putting your ear right in front, and check everything about the rest of your system. How are the L-pads set? If they are turned up all the way, the woofer might sound like it's putting out too little in comparison to the midrange.

  12. #12
    Junior Member
    Join Date
    Aug 2015
    Location
    Louisiana
    Posts
    7

    Sound weak

    Hi again Don

    There's sound coming from the woofers, it's weak sound but clear, i.e. we can hear the music, it's not distorted or so. I've checked the other components as well, they're fine.
    The L-pads are at half setting both for the tweeter and the midrange.

    The problem is that there's no bass whatsoever, they normally produce a really good bass with a lot of movement of the cone, now it's just weak music coming out and no bass. I'm not sure as to when this started, they're in my son's room and he plays a lot of games on his pc with the sound going though an amp to the speakers.

    We recently hooked up a record player and that's when I discovered the problem.

    pretty much at loss to what could be wrong.

  13. #13
    Administrator Mr. Widget's Avatar
    Join Date
    Apr 2003
    Location
    San Francisco
    Posts
    9,720
    Try pulling the woofers and connecting the speaker wire directly to each woofer... run the wires out through the ports and screw the woofers back into place. The speakers won't sound right but they should have bass and significant output. If this is the case then the problem is with the crossovers... possibly the L-pads, caps, or wiring. It is highly unlikely that the inductors failed, but it is possible.

    Give this a try and let us know what you discover.


    Widget

  14. #14
    Senior Member Don C's Avatar
    Join Date
    Apr 2003
    Location
    Santa Rosa CA
    Posts
    1,722
    A turntable is a special case, requiring the correct pre-amp input to sound right. You are hooked to a specific Phono input with a RIAA pre-amp in the system? Could you try a CD player for a while?

  15. #15
    Junior Member
    Join Date
    Aug 2015
    Location
    Louisiana
    Posts
    7

    Feedback

    Good evening guys

    So I tried to run the woofers directly from the amp after fitting them back into the cabinet. They seem to work ok, still not a very heavy bass as I remember but much better than running them through the crossover.

    I was aware of the requirement for a preamp for the recordplayer, also we have tested them running a CD.

    So what I gather from this is that it's likely that the problem is the crossover. So I guess that I have to start measuring the individual components in the crossover?

    Thanks so much for your help so far

Thread Information

Users Browsing this Thread

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

Similar Threads

  1. IE6 Issues
    By Don McRitchie in forum Forum Feedback
    Replies: 0
    Last Post: 04-26-2010, 02:52 PM
  2. HPM 100 ISSUES
    By Turnitup in forum Miscellaneous Gear
    Replies: 2
    Last Post: 08-14-2006, 10:47 PM
  3. Ebay issues
    By hector.murray in forum Lansing Product General Information
    Replies: 18
    Last Post: 03-29-2005, 09:16 AM
  4. Humidity issues ?!
    By kaaos in forum Lansing Product General Information
    Replies: 3
    Last Post: 01-13-2004, 02:18 PM

Tags for this Thread

Posting Permissions

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