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Thread: SUB18 Clone

  1. #1
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    SUB18 Clone

    Okay...I did a search and though there is other SUB18 threads in the forum, none are in the DIY section so here it goes...

    I'm building a home-theatre (mine) using clones of the M2 and desire to use the JBL 2269 driver as the basis for my subwoofer(s). That driver just has me so intrigued. I've generally liked JBL's LF drivers, particularly the 2242, which has always done me proud but the 2269...that thing is a monster! Whereas the SUB18 is listed as the compliment to the M2, I figured, why not? While I've worked with JBL (and Altec) for nearly half a century, I'm not a speaker designer, by any stretch. I'm thinking that a SUB18 clone would be a decent project.

    Has anyone measured the thing (internal volume). My best estimate is that it is a 9-cubic foot enclosure. What are the ports tuned to? I'm not bent on necessarily having an exact clone either. While I do have depth available, since this will be in a home-theatre environment and they/it will live below the stage speakers, height will be at a premium.

    Has anyone here cloned the SUB18 yet? Does anyone have it/them? If so, what are your impressions of it, including working in conjunction with the M2? I do plan to use it just as an LFE type subwoofer and NOT merely provide a bottom end to the M2.

  2. #2
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    Quote Originally Posted by sguttag View Post
    Okay...I did a search and though there is other SUB18 threads in the forum, none are in the DIY section so here it goes...

    I'm building a home-theatre (mine) using clones of the M2 and desire to use the JBL 2269 driver as the basis for my subwoofer(s). That driver just has me so intrigued. I've generally liked JBL's LF drivers, particularly the 2242, which has always done me proud but the 2269...that thing is a monster! Whereas the SUB18 is listed as the compliment to the M2, I figured, why not? While I've worked with JBL (and Altec) for nearly half a century, I'm not a speaker designer, by any stretch. I'm thinking that a SUB18 clone would be a decent project.

    Has anyone measured the thing (internal volume). My best estimate is that it is a 9-cubic foot enclosure. What are the ports tuned to? I'm not bent on necessarily having an exact clone either. While I do have depth available, since this will be in a home-theatre environment and they/it will live below the stage speakers, height will be at a premium.

    Has anyone here cloned the SUB18 yet? Does anyone have it/them? If so, what are your impressions of it, including working in conjunction with the M2? I do plan to use it just as an LFE type subwoofer and NOT merely provide a bottom end to the M2.
    I hope this thread develops as I have recently acquired a pair of 2269. All I know so far are the published specs and that they are built to take a serious beating. How would the 2245 fare with an accordian surround?

  3. #3
    Senior Member baldrick's Avatar
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    Not a "clone", the cabinet is also bigger, but a fantastic build:











    The Whole setup:


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    Well that DOES look like a lot of fun! So a 2360/2446 AND the baby cheeks (2404). Sort of the old meets new. I'm REAL familiar with the 2360/2440-2446 (and the 2450) since I'm a cinema guy. It is a very predictable/deliverable combination. Personally, I never could get behind the 2404 but I've never combined it with the 2360 so you will have gotten past its nasty region. Are you crossing it in around 9-12K to stay out of the 2446's nasty area? I could definitely see that working.

    So what do you have for us on your SUB18 like monsters? In particular, dimensions and responses? Whatever I end up doing, I'm going to need to constrain my height to 2-2.25 feet but I do have depth available to make up the volume and to accommodate ports (though I'm considering a sealed box).

  5. #5
    Senior Member baldrick's Avatar
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    Itís not mine

    iíve had a pair 2269h and used 4645b boxes, 8 cu ft tuned to 25 Hz, I guess itís very comparable to Sub18 which Is aprox 9 cu ft tuned to 25hz. Sub18 is meant for Music but for use in hometheather like I was, I think they would gain with larger cabinwt tuned lower. I plan buildig 4 new, useing aprox 12 cu ft cabinets tuned to aprox 18 Hz.

  6. #6
    Senior Member Ian Mackenzie's Avatar
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    Below is s starting point

    http://www.audioheritage.org/vbullet...l=1#post412444


    The idea is you trade a some what smaller box for x4 amplifier power and 1/2 octave extension below a QB3 alignment. That’s an F3 of 24 hertz.

    The port area would need a min of 3 four inch pvc pipes to avoid non linear power compression at high power.
    It’s a very interesting driver with a huge Dayton plate amp. The on board dsp can manage the EQ boost, sub crossover and parametric EQ for the room.

    The 2266 is also a great driver 15 inch driver . See Roberts project
    Only 2 1/2 cuft 3 .

  7. #7
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    My SUB18 clone might have hit a slight detour. A friend has convinced me to try a sealed box with the 2269H. Running the numbers, the 2269H does indeed qualify for a sealed box, about as well as for a vented box. It is tiny. Just 3-cubic feet. It should be flat to about 55Hz and then take the turn down. I'm thinking that I'll have plenty of power to drive it as low as the room (smallish at 15 x 20 feet) can reproduce. I'll have two of them. If they do the job, I might stop right there. Otherwise, I might pick up and continue down the SUB18 clone path. I really like how small these sealed boxes are.

  8. #8
    Administrator Mr. Widget's Avatar
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    Quote Originally Posted by sguttag View Post
    My SUB18 clone might have hit a slight detour. A friend has convinced me to try a sealed box with the 2269H. Running the numbers, the 2269H does indeed qualify for a sealed box, about as well as for a vented box. It is tiny. Just 3-cubic feet. It should be flat to about 55Hz and then take the turn down. I'm thinking that I'll have plenty of power to drive it as low as the room (smallish at 15 x 20 feet) can reproduce. I'll have two of them. If they do the job, I might stop right there. Otherwise, I might pick up and continue down the SUB18 clone path. I really like how small these sealed boxes are.
    That sounds very interesting. Will you use DSP to flatten out the 6dB slope below 55Hz, or count on room gain?


    Widget

  9. #9
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    DSP. The system will have a QSC Q-SYS Core (110c) processor. it will be handling the M2s DSP and most everything else audio in the system (and probably the control).

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