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Thread: sub 4645c

  1. #16
    Senior Member Don Mascali's Avatar
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    This is where they sit
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    4406, 4412A, L100, L100t3 (3 pair), L1, L7, 4645C, 4660A, 4695B, SR4735 and various DIY JBL Pro loaded systems.

  2. #17
    Senior Member Don Mascali's Avatar
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    This is part of my E-mail to Nico, I felt it might be of interest to some.


    I personaly don't pay much attention to the center channel as it just fills in dialog in movies. Same thing with surround and rear. I am not a "Golden Ear" type. I like music loud and clean. Mostly Blues and rock.

    "I bought the whole cabinet because the drivers were $600us and I got the systems for $800us. I thought I could just veneer it with the wood of my choice whenever. That way there will be 1 1/2" panels and everything will be stiffer. I have grown to like the black cabinets below the screen. They aren't so noticeable. They don't seem to need equalization due to room gain and the Beringer PEQ-2200 are for room modes and the adjustable low cut. At $60 each I couldn't build any thing cheaper. I run them in stereo 20hz low cut and up to 140hz with the built in amp low pass. The amps are Yamaha P-7000 @ 700w per side and they have never even started the cooling fans."
    4406, 4412A, L100, L100t3 (3 pair), L1, L7, 4645C, 4660A, 4695B, SR4735 and various DIY JBL Pro loaded systems.

  3. #18
    RIP 2011 Zilch's Avatar
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    Alternative box:

    From this earlier thread: http://audioheritage.org/vbulletin/showthread.php?t=402, there's options, as well.


    Quote Originally Posted by Giskard
    If you are going to build your own, the specifications to use are 8.0 cubic feet tuned to 25 Hz. Use 1" thick MDF liberally braced. The internal dimensions I personally use are 29-7/8" x 24" x 19-1/4". This puts the lowest internal standing wave at ~ 225 Hz. You can build your enclosure(s) to model the Synthesis One styling.
    [Wonders what port configuration Giskard uses on these bad boys....]

  4. #19
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    I use dual 6-inch ports.

  5. #20
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    I would like to know the speaker use in the synthesis sub ? I listen the Hercule system, and my opinion . I hope it isn't the 2242h.

    In the same think I don't like 2245h sound.

    When I look the pictures of the internal 4645c, I think that Jbl optimise them box. Make a copy of it, seem to be difficult.

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  6. #21
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    Quote Originally Posted by faulken
    I would like to know the speaker use in the synthesis sub ? I listen the Hercule system, and my opinion . I hope it isn't the 2242h.

    In the same think I don't like 2245h sound.
    According to the JBL website, the 18" Synthesis S1S-EX 18" sub uses an "Aquaplas" cone - I've never heard of any of the current pro series 18" drivers to be using this. It also has a foam surround. This seems to make it most similar to the 2245H, which has both a foam surround and white damping material, (aquaplas?), sprayed on the back of the cone. The stated frequency response down to 20hz is also similar.

    John

  7. #22
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    Ok, once again. The S1S is basically the Consumer version of the 4645. The S1S and 4645 originally used the 2245H. At that time enclosure tunings were 30 Hz. JBL later changed to the 2242H and retuned the enclosures to 25 Hz.

    "When I look the pictures of the internal 4645c, I think that Jbl optimise them box. Make a copy of it, seem to be difficult."

    I disagree.

    Quote Originally Posted by johnaec
    According to the JBL website, the 18" Synthesis S1S-EX 18" sub uses an "Aquaplas" cone - I've never heard of any of the current pro series 18" drivers to be using this. It also has a foam surround. This seems to make it most similar to the 2245H, which has both a foam surround and white damping material, (aquaplas?), sprayed on the back of the cone. The stated frequency response down to 20hz is also similar.

    John
    2242HPL - Originally it was the 2245H.

  8. #23
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    Quote Originally Posted by Giskard
    2242HPL - Originally it was the 2245H.
    So does the HPL version of the 2242 have the foam surround as pictured at the JBL website, or is the pic outdated?

    John

  9. #24
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    This is a picture of a 2245H in an S1S enclosure -
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  10. #25
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    This is a picture of the S1S with the 2242HPL -
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  11. #26
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    Old and new...

    2245H and 2242H
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  12. #27
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    Quote Originally Posted by Giskard
    This is a picture of the S1S with the 2242HPL -
    'Hard to tell on my monitor - is that a foam surround on the 2242HPL? Is the rest of the speaker the same as the 2242H, (magnet assembly, voice coil, etc.)? I notice the Fs of the standard 2242H is way up at 35hz.

    That wall of sound would fill one my walls just right!

    John

  13. #28
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    If the 2242h and the 2242hpl are different, I understand why I prefer 4645c



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  14. #29
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    The 2245H had the foam surround and aquaplas on the back of the cone.

  15. #30
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    Quote Originally Posted by faulken
    If the 2242h and the 2242hpl are different, I understand why I prefer 4645c



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    The 2242H and 2242HPL are the same except for the rubber tire. The 2242HPL lacks the rubber tire around the magnet disc. You can buy the rubber tire from parts for $40 if you want a 2242H.

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