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Thread: 4311 resurrection

  1. #16
    Senior Member Goldjazz's Avatar
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    It's alive!

    Well they're all done! I'm happy with the result. The recap has really made a difference in my opinion, cleaner and more detailed sound. I'm sure also the fresh le25's help (thanks again S.O.Stefansson) and thanks for everyone who gave advice.

    The toughest part of the job was stripping back the cabinets, made worse by the fact that they had been repainted (badly) several times in their life. Next was achieving the paint texture, so I colour matched the original paint and got a spray gun. They gun was pretty cheapo, so i had to experiment to get the texture close to the original. It has a detachable nozzle, if you removed it the splatter was too big and messy or the splatters were round and pimply, with the nozzle on it was too fine. In the end I had to jam a screw into one of the two air jet holes of the nozzle which is off to the side of the paint outlet so the paint would hit the screw and disperse a bit. Anyway I'd probably invest in a better paint gun next time . Also I'd try to track down a harder wearing type of paint next time.

    One thing I didn't do which I will do soon is apply some fresh speaker caulking to the cabinets, particularly under the woofers. Anyone was has removed a wooofer from one of these cabinets that has never been removed will know the joy of this process. The things get stuck in there, the old caulking seems to bond to the paint and you need to place a padded surface down and drop the speaker onto it to shock the bugger out of place. tough to do without damaging anything. So you're left with a non perfect flat seat on the cabinet where bits of chip board and paint have come off with the speaker, and the old caulking is no longer compliant.

    Wiring up the crossover and doing the recap was ok. I used silver loaded solder for all the joints, this was a pain to work with. I had to have the soldering iron up very hotand managed to touch one of the new caps in the process and destroy it, this set me back a week or so as i needed to order a new one. Next time I'll order more caps than I need, caps are cheap shipping to Australia from US is not! Also I used thick copper speaker wire for the hook ups, don'd do this. The stuff is just too thick to bend around and get in there. One of the points on the crossover has lots of wires coming together and its a bit of a mess, I think next time I'd get a little row of screw terminals or something and do it neater. Also the mounting of the caps on the original board is not fun, I tried double sided table and cable ties, as well as silicone goop. Also I tried to think of a better way of mounting the crossover so I wouldn't need to detach the foilcal again if I wanted to experiment with different caps in the future, In the end I didn't change it. I guess you could drill out the threads on the board, epoxy the screws in place and use wing nuts from the inside or something. Anyway I'd really recommend the recap that I've done to any 4311 owners.

    The fresh foilcal was pretty true to the original. If I'm being extremely pedantic I'd say the colour of the jbl logo was a little off compared to the original and the text a little pixelated if you're looking very very closely. But the mat black is spot on, having said all this, I would definitely buy them again. I do wonder if the foilcal will be able to be levered off without damage in the future with the 3m double-sided tape provided.

    For the Binding posts I used decent quality, large silver plated ones, which have worked out pretty well. I think i may have mounted the red and black in the wrong position in the cabinet, but they are correctly wired up and consistent for both cabinets.

    I opted not to restore the grills. I may just buy some new grills in the future. But I wouldn't use them anyway and I prefer the look without the velcro tabs attached when the grills are off.

    I also built some mass loaded speaker stands. They are 16mm thick mdf boards with spikes, and are filled with sand. This also makes a big difference in my opinion, particularly with bass response. I've opted to go a little tall with them (stands are 56cm/22 inches tall including spikes). If you've got you're 4311s sitting on a pile of books or something, you should get some solid stands made up or buy em

    That's my Sansui au10000 integrated amp driving them which is a nice combo I think.

    Anyway enjoy the pics, if anyone else is going to do a restoration like this feel free to ask me for advice.
    Attached Images Attached Images      

  2. #17
    Senior Member Goldjazz's Avatar
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    extra pics

    ...couple more pics
    Attached Images Attached Images   

  3. #18
    Senior Member ratitifb's Avatar
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    amazing resurrection!

    and very nice match with the original JBL grey paint

    By the way what paint reference and/or formalution have you used ?

  4. #19
    Senior Member Goldjazz's Avatar
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    Quote Originally Posted by ratitifb View Post
    amazing resurrection!

    and very nice match with the original JBL grey paint

    By the way what paint reference and/or formalution have you used ?

    Thanks! So I took the cabinets to a place to have the colour matched, the sides and tops had been painted over many times but the front and backs were unaltered. So hey were able to take a reading and get a pretty close match. So the custom mixture has some info printed on the label which i guess would allow it to be mixed up again easily. If you like I can take a pic of that and share it.

  5. #20
    Senior Member Greg86z28's Avatar
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    Nice Job!

  6. #21
    Senior Member wpod's Avatar
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    Beautiful Work!

    I still think that the 4310 and 4311 look much more "dignified" in their grey attire. If you really want to put the icing on the cake, try one of the "improved" L100 style crossover upgrades , the one with resistors and inductors (besides the caps). In my own experience, I think the new crossovers bring the monitors to a level of performance that they truly deserve. If you want to try it on the cheap, pick up a pair of L110, L-50, or 4313b crossovers on eBay (less than $75.00) and give it a listen. Either way, enjoy those monitors, they look super! Paul
    JBL 4343, JBL L300 Summit, UREI 811, JBL 4311, JBL 4301, JBL L5, JBL L50, JBL L100 , to name a few

  7. #22
    Senior Member Goldjazz's Avatar
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    Quote Originally Posted by wpod View Post
    I still think that the 4310 and 4311 look much more "dignified" in their grey attire. If you really want to put the icing on the cake, try one of the "improved" L100 style crossover upgrades , the one with resistors and inductors (besides the caps). In my own experience, I think the new crossovers bring the monitors to a level of performance that they truly deserve. If you want to try it on the cheap, pick up a pair of L110, L-50, or 4313b crossovers on eBay (less than $75.00) and give it a listen. Either way, enjoy those monitors, they look super! Paul
    Thanks. Yeah I like the grey too. Something awesome happens when you've finished those clean greay boxes and you load the drivers in and put on the foilcal it just all comes together all of a sudden...very cool. Yeah I once had a pair of L110's but dont have em anymore, will think about that cheers.

  8. #23
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    The look superb

    Goldjazz,

    the 4311s look superb, excellent job I'm happy to have made a small contribution in the form of the LE-25 tweeters,

    Sigurd

    Quote Originally Posted by Goldjazz View Post
    Thanks. Yeah I like the grey too. Something awesome happens when you've finished those clean greay boxes and you load the drivers in and put on the foilcal it just all comes together all of a sudden...very cool. Yeah I once had a pair of L110's but dont have em anymore, will think about that cheers.
    Sigurd O. Stefansson,
    Bergen, Norway

  9. #24
    Heather [Senorita member] hjames's Avatar
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    VERY nice looking pair of speakers! Kudos, and enjoy!
    2ch: Oppo, JoLida 502CRC, JBL L212, 18ti,240ti; Heath AS101, Von Schweikert VR4
    7.1: Oppo BDP103D, B&K, UREI 809A, JBL B460

  10. #25
    Senior Member Goldjazz's Avatar
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    Quote Originally Posted by S.O.Stefansson View Post
    Goldjazz,

    the 4311s look superb, excellent job I'm happy to have made a small contribution in the form of the LE-25 tweeters,

    Sigurd

    Cheers...a big contribution the nice fresh tweeters really make it.

  11. #26
    Senior Member audiomagnate's Avatar
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    What's your source??? Speakers look great BTW. Are there no coils in the crossover just like the L100? I thought the studio version had a more complex crossover.

  12. #27
    Senior Member gsb001's Avatar
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    4311 is my favorite out of the original control monitor models 4311, 4311B and 4312A's.
    Steve
    Huntley Audio.com

  13. #28
    Senior Member Goldjazz's Avatar
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    Quote Originally Posted by audiomagnate View Post
    What's your source??? Speakers look great BTW. Are there no coils in the crossover just like the L100? I thought the studio version had a more complex crossover.
    Thanks. Source is just digital files through a musical fidelity m1 dac into the Sansui at the moment. Yeah it's a very simple crossover actually just two caps and two Lpads.

  14. #29
    Senior Member Goldjazz's Avatar
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    Quote Originally Posted by gsb001 View Post
    4311 is my favorite out of the original control monitor models 4311, 4311B and 4312A's.
    Steve
    Huntley Audio.com
    Cool, yeah I really like the 4311 too. I haven't tried the others but I will if I get a chance. They actually don't come up that often. I'm told there is something special about the Alnico midrange on these 4311A's though I haven't heard the other versions to compare. I wanted to just restore the original cap values with fresher caps to retain the original sound.

  15. #30
    Senior Member Goldjazz's Avatar
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    Videos

    I know you can't tell much from videos taken through a mobile phone but here's a couple of clips of them in action:

    https://www.youtube.com/watch?v=31PNUT35WLw

    Yes that's the sound of rain in the background in both vids not static

    https://www.youtube.com/watch?v=p6mdtFn_0Bc


    Enjoy.

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