+ Reply to Thread
Page 4 of 4 FirstFirst ... 234
Results 46 to 53 of 53

Thread: 4333 / S300 / L300 equivalent bandbass circuit

  1. #46
    Junior Member
    Join Date
    Apr 2011
    Location
    Awestralia
    Posts
    3
    Yes yes, first post and I'm reviving the dead and buried
    But why start a new thread when this one is perfect.

    I'm renovating a pair of home built speakers (2215h/2420/2405) and will be using this crossover so kindly supplied by 4313B.
    But I have one question.
    As I don't have the variable L pads, could you guide me as to a suitable fixed resistor solution for both the mid and tweeter pads please ?
    Thank you.

    Quote Originally Posted by 4313B View Post
    Here is the schematic.

    It's voltage drive is a dead ringer for the original voltage drive as measured on December 16th, 1975.

    Most of the components are available from Parts Express. The LF inductor is the 14 gauge perfect layer wound air core. For those who like the signature JBL bass hump at ~ 30 Hz you may need to tune the enclosure up a couple of Hz. All the MF inductors are the 18 gauge perfect layer wound air cores.

  2. #47
    Administrator Mr. Widget's Avatar
    Join Date
    Apr 2003
    Location
    San Francisco
    Posts
    8,475
    Quote Originally Posted by OldManWagon View Post
    Yes yes, first post and I'm reviving the dead and buried
    But why start a new thread when this one is perfect.

    I'm renovating a pair of home built speakers (2215h/2420/2405) and will be using this crossover so kindly supplied by 4313B.
    But I have one question.
    As I don't have the variable L pads, could you guide me as to a suitable fixed resistor solution for both the mid and tweeter pads please ?
    Thank you.
    Welcome to the forum... can't help with the specific question, but you need a different network since you are using the LE15A/2215 woofers instead of the 136A/2231A that this network is designed for.


    Widget

  3. #48
    Junior Member
    Join Date
    Apr 2011
    Location
    Awestralia
    Posts
    3
    Thanks, hi.

    I'm using the 16ohm 2215h, with a change to the bass section of this crossover.
    (zobel 13.5uF 10 ohm, filter 3.3mH 12uF - Copied from the 3110 crossover).

    ok, so next question (related) would be, if the 2420 and 2405 are ~10ohm impedence, with the 20 ohm across them gives ~8ohm 'driver' as seen by the crossover, so therefore, if i know the sensitivity of the drivers, I can calculate the required L-Pad values.

    So if;
    2215 = 96db/w/m
    2420 = 118db/w/m (24db pad ?? whats the real output of this driver when mounted to a horn/lens ??)
    2405 = 104db/w/m (8db pad)

    Can anyone see anything obviously wrong with those numbers ?
    Or have any comments..

    At this stage I'm going to build the crossovers, with fixed L-pads of around 10db att. in place of the variable ones, and fine tune levels by ear and frequency sweeps.

  4. #49
    Senior Member ivica's Avatar
    Join Date
    Jan 2008
    Location
    serbia
    Posts
    800
    [QUOTE=OldManWagon;311738]Thanks, hi.


    So if;
    2215 = 96db/w/m
    2420 = 118db/w/m (24db pad ?? whats the real output of this driver when mounted to a horn/lens ??)
    2405 = 104db/w/m (8db pad)

    Can anyone see anything obviously wrong with those numbers ?
    Or have any comments..
    ....

    my experience with 2420 with 2308 Lens and 2307 the sensitivity is about 106~108dB/1m

  5. #50
    Senior Member ivica's Avatar
    Join Date
    Jan 2008
    Location
    serbia
    Posts
    800
    Quote Originally Posted by 4313B View Post
    As per a PM today here is the schematic for bi-amp only L300's, S300's and 4333's.

    I personally would bias (charge couple) them.
    .....

    Capacitor-"serial capacitor" to the MID section would be well-come in order to protect
    242x compression driver
    ....
    Name:  3133.jpg
Views: 1407
Size:  53.3 KB
    Attached Images Attached Images  

  6. #51
    Junior Member
    Join Date
    Apr 2011
    Location
    Awestralia
    Posts
    3
    Quote Originally Posted by ivica View Post

    my experience with 2420 with 2308 Lens and 2307 the sensitivity is about 106~108dB/1m
    Cool, Thanks.
    Made up the crossover and had a play, Around 9-12 DB Att. on both mid and tweeter seem roughly the area to aim for.

  7. #52
    Junior Member
    Join Date
    Oct 2007
    Location
    Chicago
    Posts
    29

    S8 charge coupled network?

    This may be a different thread question but has a S8/S20 charge coupled network been worked out to replace the LX5/N7000-N8000 combo?

  8. #53
    Senior Member mbottz's Avatar
    Join Date
    Apr 2005
    Location
    Dallas Texas
    Posts
    235

    Help with charge coupled design

    Has anyone put out a diagram for a charge coupled crossover at 500 and 7000 hz? Or can someone note the mods to the Charge coupled l-300 crossover to change it to 500 and 700hz. I am proficient with the restoration and repair thing, but when it comes to design of the crossovers, I wish to leave it to those with more experience. Any help would be greatly appreciated.

    Thanks

    MB
    Restoring the legend, one cabinet at a time

+ Reply to Thread

Thread Information

Users Browsing this Thread

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

Posting Permissions

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