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Thread: sub 4645c

  1. #31
    RIP 2011 Zilch's Avatar
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    Unless there's something I don't understand, there's no magic in this. If you want a shorter, deeper box, you build according to Giskard's dimensions. Otherwise, use those of the 4645. In either case, you'll want to use heavy material and massive bracing. For more alternatives, and construction suggestions, check out this article from the library: http://www.lansingheritage.org/html/.../1983-subs.htm.

    Either driver (2245 or 2242) will work an any of the boxes. The JBL Tech Note says 2242 replaces 2245. They have done so in their product offerings, so I take them at their word. Both require EQ to reach 20 Hz. BUT, it doesn't matter. In home use, room response augments the low end to obviate the necessity of EQ.

    You want more, build 2 or 4 of them, and mutual coupling will push the response further down there as well. JBL recommends using arrays of 8.

  2. #32
    Senior Member Don Mascali's Avatar
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    http://www.lansingheritage.org/html/.../1983-subs.htm

    That is thesame article that I used to design my B-380 clones. They are great speakers, I just needed more eficiency to match up with the others. Doubling up with the 4645Cs does a fine job.
    4406, 4412A, L100, L100t3 (3 pair), L1, L7, 4645C, 4660A, 4695B, SR4735 and various DIY JBL Pro loaded systems.

  3. #33
    Obsolete
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    Agreed Zilch and Don

  4. #34
    JBL 4645
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    Quote Originally Posted by Don Mascali View Post
    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."


    Don

    That’s the same JBL 4645C that’s used at the Empire Leicester square only they use x16 of them with a staggering 20KW alone for the LFE.1.

  5. #35
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    Doubts

    JBL 4645C cabinet dimensions

    25 ½” W x 39” H x 17 ½” D

    Front and rear baffle are made from 1” MDF

    Front to back stiffener at the top center of the driver cutout is 5 ¼” x 16”[/quote]


    I have a question: D= 17 1/2", front= 1" and rear= 1"

    As can be the measure? Front to back stiffener 16" .

    Thanks.

    Roger

  6. #36
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    Where to find 7-1/8" port for 4645C cabinet

    First off, Dan thanks so much for posting the dimensions for the 4645C cabinet. Usually when you build a speaker box, you run down to your electronic parts store to purchase a pre-made port or run to your hardware store to pick up some raw PVC pipe to turn into a port. Only issue with this is that pre-made ports are usually in the 2-4" range, and PVC pipe probably up to 6".

    Where the heck would I be able to find a very precise 7-1/8" paper or PVC port, used in the 4645C??

    I plan on building this cabinet, but am lost where to find such a big and specific size port. Any help would be greatly appreciated.

    Please toss me an email as I am not always on this forum: [email protected]

    Thanks so much for your time !!!

    Neil

  7. #37
    Senior Member Eaulive's Avatar
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    Yup, I'm building one also so I will need to source that somehow.
    We can get close like with 6" or 8" and change the port length accordingly, but I still would like the real deal
    My avatar: 4520 loaded with 2225H on E140 frames,
    1x 2202H on custom front loaded horn, 2x 2426 on 2370.

  8. #38
    Senior Member Eaulive's Avatar
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    Quote Originally Posted by lm324 View Post
    JBL 4645C cabinet dimensions

    25 ½” W x 39” H x 17 ½” D

    Front and rear baffle are made from 1” MDF

    Front to back stiffener at the top center of the driver cutout is 5 ¼” x 16”

    I have a question: D= 17 1/2", front= 1" and rear= 1"

    As can be the measure? Front to back stiffener 16" .

    Thanks.

    Roger[/QUOTE]

    Now that I'm drawing the plan I end up with the same doubt. If the box is 17½" deep and the baffle and back are 1" thick and recessed by ½", how can the center brace be 16" long ?
    Did you measure it or you just assumed? I guess it's more like 14½" no?
    My avatar: 4520 loaded with 2225H on E140 frames,
    1x 2202H on custom front loaded horn, 2x 2426 on 2370.

  9. #39
    Senior Member Don Mascali's Avatar
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    I just measured it and it is 15" deep inside.

    There is a company that makes concrete forms called Sonotube. It can be purchased in 8".

    PVC pipe can be found in 8" also.
    http://www.mcmaster.com/#pvc-(schedule-40)-pipe/=f84nyj @$59.41 for a 5' length.
    4406, 4412A, L100, L100t3 (3 pair), L1, L7, 4645C, 4660A, 4695B, SR4735 and various DIY JBL Pro loaded systems.

  10. #40
    Senior Member Eaulive's Avatar
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    Quote Originally Posted by Don Mascali View Post
    I just measured it and it is 15" deep inside.
    Hi Don.
    Still doesn't add up, maybe then the front and back recess is only ¼" ?


    I was trying to get the measures as close possible to the original so I didn't have to tune the box, but now since the port size will change, I will have to retune it anyways so ½" difference in depth won't kill me
    My avatar: 4520 loaded with 2225H on E140 frames,
    1x 2202H on custom front loaded horn, 2x 2426 on 2370.

  11. #41
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    Quote Originally Posted by Don Mascali View Post
    I just measured it and it is 15" deep inside.

    There is a company that makes concrete forms called Sonotube. It can be purchased in 8".

    PVC pipe can be found in 8" also.
    http://www.mcmaster.com/#pvc-(schedule-40)-pipe/=f84nyj @$59.41 for a 5' length.

    Hi Don,

    Sorry to disturb you with this but like EauVive from Montreal, I'm going to start to build two 4645C based on your given dimensions, I've found a carton tube manufacturer that will make an exact copy of tube, thus I will not need to retune the box but I'm still struggling with this 1/2 inch depth error on the box as previously mentionned, if I take your dimensions the inside depth is 14 1/2 inch and not 15, could you please confirm which dimension I need to use to get an exact copy of the 4645C?

    Thanks

  12. #42
    Senior Member Don Mascali's Avatar
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    OK I found the problem;

    The actual overall depth is 17 3/4". I don't know where this measurement went wrong but this is the mistake.
    The inset on the front and back 1" boards is 7/16". 15" inside from front to back between the boards.

    7/16" |-- 1" -- |----------- 15" -------------|-- 1" -- | 7/16"

    Sorry about the mix up.
    4406, 4412A, L100, L100t3 (3 pair), L1, L7, 4645C, 4660A, 4695B, SR4735 and various DIY JBL Pro loaded systems.

  13. #43
    Senior Member Eaulive's Avatar
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    Quote Originally Posted by Don Mascali View Post
    OK I found the problem;

    The actual overall depth is 17 3/4". I don't know where this measurement went wrong but this is the mistake.
    The inset on the front and back 1" boards is 7/16". 15" inside from front to back between the boards.

    7/16" |-- 1" -- |----------- 15" -------------|-- 1" -- | 7/16"

    Sorry about the mix up.
    I still have a 1/8th of an inch discrepancy, but that's close enough
    My avatar: 4520 loaded with 2225H on E140 frames,
    1x 2202H on custom front loaded horn, 2x 2426 on 2370.

  14. #44
    Senior Member Eaulive's Avatar
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    Quote Originally Posted by Don Mascali View Post
    OK I found the problem;

    The actual overall depth is 17 3/4". I don't know where this measurement went wrong but this is the mistake.
    The inset on the front and back 1" boards is 7/16". 15" inside from front to back between the boards.

    7/16" |-- 1" -- |----------- 15" -------------|-- 1" -- | 7/16"

    Sorry about the mix up.
    And by the way Don, the measurements you have (39 x 25½ x 17¾) concurr with the JBL spec sheet for the 4641.

    http://www.jblproservice.com/pdf/The...eries/4641.pdf

    According to JBL, the 4645B/C measures 39¾ x 26½ x 17¾ and the original 4645 is 39¾ x 26½ x 17¼

    The 4645C and the 4641 are quite similar, but they use 2242 and 2241 respectively, I don't know what to think about all this.

    Anyways, I want to build 4641s since I have 2241 woofers so problem solved
    My avatar: 4520 loaded with 2225H on E140 frames,
    1x 2202H on custom front loaded horn, 2x 2426 on 2370.

  15. #45
    Senior Member Don Mascali's Avatar
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    Where is the discrepancy? (15+1+1=17" and 7/16"+7/16"=3/4") It seems to add up to 17 3/4".
    4406, 4412A, L100, L100t3 (3 pair), L1, L7, 4645C, 4660A, 4695B, SR4735 and various DIY JBL Pro loaded systems.

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