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Thread: My JBL 4355 Homecinema Soundbar build

  1. #1
    Junior Member music2u's Avatar
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    Nov 2015
    Frankfurt (Germany)

    My JBL 4355 Homecinema Soundbar build

    Hello all!

    Although I read in this forum for some time now, this is my first post. By way of introduction, I am Stefan, I live in a small city very close to Frankfurt/Germany. So, apologies for the one or the other typo or grammar mistake. I turned 50 this year and my interest in HiFi and DIY started in the eighties with a pair of Infinity Kappa 8. Lately I tried electrostats and open baffle subwoofers.

    However, I have always been interested in a very lively sound experience. I have to thank Holger Barske ("hb") for the inspiration. His 4355 build is documented elsewhere in this forum. His build encouraged me to try it by myself.

    On one hand, my room was not wide enough for a proper placement of a pair of 4355. On the other hand, my interest is not only music but also homecinema. Why not combining the two?

    • The woofers of the 4355 are actively crossed over anyhow.
    • The mid-high section may be better arranged in a vertical row.
    • The four 2235 can better be replaced by two 2245
    • All Drivers could be arranged in one cabinet (inspired by the Paragon)

    I started with a brief coloured image to get an idea how things could tie together:

    Name:  03_Planung Konzept.jpg
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    I learned and profited a lot from this forum and without the documents and hints and tips herein, this would not have been possible. Therefore, the intention of this thread is, to share some of my experiences and pictures with you to say "thank you guys". From my own experience, I always enjoyed a lot to view storys and pictures of someones built.

    So, I hope you enjoy it.

  2. #2
    Junior Member music2u's Avatar
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    Nov 2015
    Frankfurt (Germany)

    Get all the chassis

    It is hard to get all the chassis here in Europe in good condition at a reasonable price. Finally, it took about a year to collect everything. The receipt of every part was celebrated like eastern and x-mas on one day......

    I expected the project to fail, if I can not get the 2441/2440 and the 2245 drivers in advance. I found 2440 with Radian dia's at an acceptable price in Germany. They were the first to come:

    Name:  08_Ankunft JBL 2440-2.jpg
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    Next thing was to get the 2245. I found them also in Germany, nearly mint and freshly refoamed. The seller did not want to send them. I planned to go to a bike rallye nearby so I decided to go there by car and pick them up (that cost a number of beers at the rallye, not to show up on my bike...):

    Name:  03_Ankunft JBL 2245-1.jpg
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    The 2202 where not easy to find and they were all in bad conditions. I got them from Germany and the UK:

    Name:  02_Ankunft JBL 2202-2.jpg
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    They have all been reconed by a small local company (at a reasonable price) who claim, that JBL Germany sends the one or the other vintage chassis to them for repair.

    The 2405 were not hard to find:

    Name:  06_Ankunft JBL 2405-2.jpg
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    It turned out, that the h93/2311 are really hard to find. I got them from the US as well as the clamps. But it is impossible to find the lenses. So I ordered them at Kendrick and I think the price is also about fair. The email contact, delivery and everything was excellent:

    Name:  10_Ankunft Kenrick 2311-2.jpg
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  3. #3
    Junior Member music2u's Avatar
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    Nov 2015
    Frankfurt (Germany)

    Build the (test) enclosure

    As my room is exactly twice as long as wide, I have some problems with room modes. So, I did not know, whether this will work in my room. And this is my first experience with JBL. As prices for good wood have gone up over the past years, I decided to start with an easy test enclosure made of particle board.

    The volume was calculated based on the documentation of the subwoofer for the 2245 (2 times the 20Hz Version with 12 sqrft). The size is 2m x 0.5m x 1.1m.

    First thing was to cut the holes into the baffle wall:

    Name:  01_Gehäuse Ausfräsung Garten.jpg
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    To keep the test enclosure simple, I decided to use the mid woofer housing also as bracing for the enclosure:

    Name:  08_Gehäuse Mitteltongehäuse und BR.jpg
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    First look at the raw enclosure:

    Name:  14_Gehäuse Rohspan und Rotwein.jpg
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    This cannot be overseen in the living room. I decided to add some paint to see if I like a "blue wall" of 2 x 1 m in my living room:

    Name:  13_Gehäuse Rohbau lackiert.jpg
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    The damping was done with hemp mats:

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  4. #4
    Junior Member music2u's Avatar
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    Nov 2015
    Frankfurt (Germany)

    Build the crossovers

    I decided to try the charge coupled crossovers. As a tribute to originality I buildt the original version with a lot of inductors.... Actually I am in some doubt whether that was a wise decision. However, as I would always doubt, whether the 9V battery is still in good condition I decided to go for the diode method. Again, I can not thank enough the members of this forum with their documentation and insights. There is so much to learn and to gain here. Good work!

    A lot of parts had to be ordered for three crossovers:

    Name:  01_Weichen Ankunft Bauteile.jpg
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    The inductor values are not common in Germany. So I had to unwind them individually:

    Name:  04_Weichen Spulen abgewickelt.jpg
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    Then everything was placed properly for another test-"enclosure":

    Name:  03_Weichen Rohbau.jpg
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    And this is a completed crossover:

    Name:  02_Weichen Final CC Dioden Methode.jpg
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    Finally, I "produced" the gaskets by myself out of foam rubber plates:

    Name:  11_Dichtungen 2405 2440 2311.jpg
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  5. #5
    Junior Member music2u's Avatar
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    Nov 2015
    Frankfurt (Germany)

    Here we are: Final pictures in test enclosure

    Everything was put together and there was a long way to go with measurements etc.

    However, while I write theses posts I listen to Gregory Porter (on Vinyl) and it all paid off. I love the sound, although I have a number of questions and ideas for improvements ;-)

    Name:  02_Testgegäuse Final 2.jpg
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    Name:  03_Testgegäuse Final 3.jpg
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    Name:  04_Testgegäuse Final 4.jpg
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    Thanks for watching. I hope you enjoyed it...


  6. #6
    Senior Member
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    Jul 2013
    Holy Moly!!

  7. #7
    Senior Member Ed Zeppeli's Avatar
    Join Date
    Dec 2007
    Nanaimo, BC
    This is insane. I love it.

    Maybe it will inspire Samsung's next soundbar.
    DIY Array, 2242 sub, 4408, 4208, Control 8SR, E120 Guitar cab, Control 1, LSR305.

  8. #8
    Heather [Senorita member] hjames's Avatar
    Join Date
    Nov 2005
    NoVA - DC 'burbs
    OMG - Fantastico!

    Considering it's nothing that can be easily moved,
    did you build a base with wheels for it?
    2ch: Oppo, Acurus RL-11, JBL 240ti, Heath AS101, Carver TFM-25,Von Schweikert VR4
    7: Oppo BDP103D, B&K, UREI 809A, JBL B460,

  9. #9
    Join Date
    Sep 2009
    Houston, Texas
    Quote Originally Posted by music2u View Post
    Thanks for watching. I hope you enjoyed it...
    When I was building my DIY 4350's I considered pair of 18's instead of 15's but the 8 cu ft. enclosure for each 18 gave me a pause.
    Is this just one speaker or a stereo pair?


  10. #10
    Senior Member srm51555's Avatar
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    May 2013
    Awesome!!! Welcome to the forum.

  11. #11
    Senior Member Woody Banks's Avatar
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    Feb 2004

  12. #12
    Administrator Mr. Widget's Avatar
    Join Date
    Apr 2003
    San Francisco
    I want to say that is "out of the box" thinking, but that is one hell of a box!

    It it looks wonderfully crafted with great care and passion. Congratulations!


  13. #13
    Senior Member
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    Jun 2013
    Looks awesome, nice work. Are you going to build another for stereo ? I can only imagine how sweet it must sound.

  14. #14
    Senior Member pos's Avatar
    Join Date
    May 2007
    Paris, France
    Nicely done and impressive!
    Is this really only a test enclosure? It looks better than my "final" builds

    What active crossover are you using?
    How do you distribute the three channels among the two woofers?

  15. #15
    Senior Member
    Join Date
    Nov 2009
    somewhere on Hood Canal
    Wow!! What a neat idea! Do you have some plots?

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