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Thread: JBL 4365 life-hack

  1. #16
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    Hi Guys,

    Am enjoying this thread as I too feel that more could be coaxed from 4365s.

    In particular, the DIY crossovers mentioned by Baldrick sound very interesting. Do you have any more info? Schematics maybe?

    Jim.
    Linn KDS, Linn KK, Bryston 4B SST2, JBL 4365
    Shropshire, UK.

  2. #17
    Senior Member baldrick's Avatar
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    The modified crossover uses Equal values but Components with better quality, i.e. the resistor, org vs New:









    The best solution would probably to also include a LP filter @ aprox 15k on the MF, maybe it could be copied from S9900 if it has a LP filter? Haven't checked....

  3. #18
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    I think at the best way is to change all capacitors in the high network not only two, if you are going to get best out of them
    I see at this lookīs like high end capacitors but the low quality capacitors are still left in the board



    Ari

  4. #19
    Member Fitero's Avatar
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    I had that thought as well when I pulled out the crossovers of my 4367's, but when I added up how much it would have cost me to get all of the values I quickly gave up. Some of those caps are also for the circuits that won't be active if not selected via the attenuators on the front of the speakers.

  5. #20
    Senior Member baldrick's Avatar
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    The most important parts is the 2 caps in series and also the resistors in use (you donīt have to replace all 5 connected to the switch). But since the network is CC replacing the caps with better is probably not equal important that it would with a none CC network.

  6. #21
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    Quote Originally Posted by Fitero View Post
    I had that thought as well when I pulled out the crossovers of my 4367's, but when I added up how much it would have cost me to get all of the values I quickly gave up. Some of those caps are also for the circuits that won't be active if not selected via the attenuators on the front of the speakers.

    I bought all the capacitors new from Jantzen in Denmark and believe me they are not cheap
    but the different in sound quality are there also



    Ari

  7. #22
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    Quote Originally Posted by baldrick View Post
    The modified crossover uses Equal values but Components with better quality, i.e. the resistor, org vs New:The best solution would probably to also include a LP filter @ aprox 15k on the MF, maybe it could be copied from S9900 if it has a LP filter? Haven't checked....
    Hi guys. Itís already been almost six years since I did this capacitor upgrade. In the mean time I have been working on my diy dac, and after spending much time and money, I now feel that it play so good that my thoughts starts to focus on other things to improve in my setup. I have to admit that Iím a music and hifi lover 24/7, but itís ok since I love this hobby.My focus came back to my jbl 4365, which I felt in love with back in 2011. They are still here with me, and after the last upgrade, they sing like never before. The upgrade is as follow.I have replaced the electrolytic caps (3uf) in the LF filter, with Clarity CSA poly caps, and for the HF filter, also Clarity CSA 33uf and16 uf. On top of the Claritys, I bypassed them with Miflex 0.1uf copper film caps. I also replaced the resistors between the caps from the stock resistors to Path resistors.The difference is easy to hear. More Clarity, detail, and much deeper soundstage with better separation between instruments and voices. The human voice sounds more organic, and with less sibilants. I still prefer the sound without the UHF drivers connected. I simply put a jumper on the crossover and disconnected them.It is easy to revers if I should want it later.At last I have to say that if you are comfortable with soldering and have speakers you realy like and wants to take them a step further up the latter, replace the stock parts. But, remember, always use the original values from the stock parts.A picture before and after.

  8. #23
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    Hi guys. Itís already been almost six years since I did this capacitor upgrade. In the mean time I have been working on my diy dac, and after spending much time and money, I now feel that it play so good that my thoughts starts to focus on other things to improve in my setup. I have to admit that Iím a music and hifi lover 24/7, but itís ok since I love this hobby.My focus came back to my jbl 4365, which I felt in love with back in 2011. They are still here with me, and after the last upgrade, they sing like never before. The upgrade is as follow.I have replaced the electrolytic caps (3uf) in the LF filter, with Clarity CSA poly caps, and for the HF filter, also Clarity CSA 33uf and16 uf. On top of the Claritys, I bypassed them with Miflex 0.1uf copper film caps. I also replaced the resistors between the caps from the stock resistors to Path resistors.The difference is easy to hear. More Clarity, detail, and much deeper soundstage with better separation between instruments and voices. The human voice sounds more organic, and with less sibilants. I still prefer the sound without the UHF drivers connected. I simply put a jumper on the crossover and disconnected them.It is easy to revers if I should want it later.At last I have to say that if you are comfortable with soldering and have speakers you realy like and wants to take them a step further up the latter, replace the stock parts. But, remember, always use the original values from the stock parts.

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