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Thread: JBL C45 S8 speakers questions

  1. #16
    Administrator Mr. Widget's Avatar
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    Quote Originally Posted by jrsevy View Post
    I think I figured 8.4 cubic feet with all bracing accounted for. I calculated the port dimensions at 28Hz. The frequency I found for the LE-15A used by JBL is 30Hz, so I'll maybe play around with it.

    As long as we're on the subject of the woofer enclosure, would you recommend adding insulation on all sides? I saw pictures of Metregons that appeared to have insulation on all but the back and the baffle. I plan on using 1.5" thick denim insulation from Home Depot. Don't want fiberglass fibers going airborne through the port from the woofer movement.
    Denim is excellent. I would stick with 30Hz tuning especially since you’ll likely gain a little effective volume from the additional insulation. I would put it on five sides. Everywhere but the baffle.


    Widget

  2. #17
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    Quote Originally Posted by Mr. Widget View Post
    Denim is excellent. I would stick with 30Hz tuning especially since you’ll likely gain a little effective volume from the additional insulation. I would put it on five sides. Everywhere but the baffle.


    Widget
    Thanks!

  3. #18
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    Finished custom Metregon

    This was a big project. I had to build a form that could hold the weight of a truck for laminating the curve, then cut the doors short from that and add 1/2" walnut to the edges of the doors and opening before veneering with two-ply walnut in one sheet. The two issues I had with assembly were that the curve wasn't completely square, so I had to raise the bottom on one side to get the door to line up right with the installed Soss hinges and needed to add some trim. Also wasn't confident enough in exact placement to pre-mortise the louver slots before assembly, so I mortised them into 1/4" walnut strips but now can easily pull them out after removing the screws. So, not exactly like the original plans I have but adding a center cabinet was a must for me.

    My "Metregon" is 103" long and 31" high vs. 74" x 30". The re-foamed woofer sounds much better now and I also have a Klipsch 12" subwoofer in the room for extra punch.

    Anyone think I should replace the diaphragms in the 075 and 375? They are original with the red wax screw seals (early 70's). They sound really clean to me.

    I'm happy with the results (wife too!) and glad I didn't sell the components of my S8 Flair speakers. Now I need to see if there is any interest for my empty Flair cabinets or they're going to a dumpster.Name:  IMG_1597.jpg
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  4. #19
    Administrator Mr. Widget's Avatar
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    Magnifient! I like your proportions better than the original.

    Do you have any additional photos?


    Widget

  5. #20
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    Ditto what Widget said, very frickin’ cool!

  6. #21
    Senior Member grumpy's Avatar
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    Turned out quite nicely! Well done.
    Personally, I'd leave the diaphragms as they are unless you notice an actual problem.
    Even then, I'd likely try a different set of cores (vs popping open original/sealed units).

  7. #22
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    What a gorgeous looking cabinet/build!!



    PS: As Grumpy mentioned, I wouldn't mess with the diaphragms.

  8. #23
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    Quote Originally Posted by Mr. Widget View Post
    Magnifient! I like your proportions better than the original.

    Do you have any additional photos?


    Widget
    I need to pull it away from the wall to patch the holes in the wall with a walnut board (no more clear redwood to be found) and then I'll take more pictures with daylight lighting. I'll post that in a few days.

  9. #24
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    Quote Originally Posted by Earl K View Post
    What a gorgeous looking cabinet/build!!



    PS: As Grumpy mentioned, I wouldn't mess with the diaphragms.
    Thanks. I'm glad you guys like it!

  10. #25
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    More pics

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  11. #26
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    more

    I mortised some short pieces of anodized aluminum angle on the inside of the doors to prevent damage from sliding the shelves out if the doors aren't completely open. Otherwise pretty much done, short of touching up a couple of scratches.Name:  IMG_1612.jpg
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  12. #27
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    Wow!

    That's one great looking setup/room that wonderfully compliments your Metregon creation .


  13. #28
    Administrator Mr. Widget's Avatar
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    Very nice! Makes me want to make some wood dust!
    Thanks for sharing!


    Widget

  14. #29
    Senior Member srm51555's Avatar
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    Awesome job and layout!

  15. #30
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    I replace my 075 tweeters with 077 tweeters and changed out the N7000 crossovers with N8000. Listening to Aerosmith Dream On, I've never heard the synthesized high notes in the opening part of the tune before. Played it on my high end 2016 Klipsch speakers in my media room and my 1970's JBL's sounded better. Glad I did this project! My wife says I'm done now. Mounting the 077's externally works better than the deep angled mount on the baffles. Selling my 075's on eBay now and will list the N7000's after that. Name:  IMG_1675.jpg
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