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Thread: Box for JBL 2245H

  1. #1
    Senior Member Niklas Nord's Avatar
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    Thumbs up Box for JBL 2245H

    What would be the best solution for the JBL 2245H 18"
    driver, suited for Very low frequency playback.

    A flat response (in room) down to 14hz-18hz is that possible?

    Lets say, i have 4 JBL 2245 woofers.

    they will play frequency up to 50hz approx


    Will 4 of them do some nasty things with my home?

    ----------
    then from 50hz the 2234 will take ower...!!
    ----------

    has anyone been trying to mount the 2245 with an passive radiator, like the stryke 18" radiator, in a big box with 2 or 3 radiators the 2245 would go lower and higher spl i think, but how would the hifi get... i´m in simulationmode right now

    Best Regards
    .Niklas Nord, Stockholm Sweden
    Proud owner of the Project K2 s9500 system

  2. #2
    Senior Member Ian Mackenzie's Avatar
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    Nicklas,

    It depends on what you are trying to do??

    Box designs
    Suggest you look at the article by Greg Timbers/ Lorr Kramer on the main site, it details all you need to know about the 2245H bass enclosures complete with drawings. I have seen other articles for Coffin style couplers at go very low also using multiple drivers.

    I recall the 12 cu ft version is flat to 20 hertz, unless you live in a large living area anything below 25 - 30 hertz is wasted unless you sit over the top of the box a receive what is termed "global output " response which could result in a major bowel disfunction!

    Matching to the System and the room
    There are also problems with group delay using very low (ELF) subs crossed over low (50 - 80 hertz)and you will need to time align the cabinet for best effect, meaning the sub boxes will need to be positioned forward of the main system: See Drews Clues on the main site for setup and calibration of subs, Drews design uses the JBK 2242 18". Otherwise it will sound strange on musical program material.

    I have not seen 18" passive radiators, but this would require more than one 18" passive per 2245 as there would be excursion limited output and compression of transients compared to a ported design.

    Subs for Hifi
    My 2245s are tuned to around 28 hz for -3db @ 32 hertz in a 9 cu ft box, as part of the complete composite system (JBL 4345) the results are outstanding in terms of bass extension and musical accuracy. With a Clair Bros Phase Linear 700 its also a killer for home theatre and in many respects sheer amp horsepower is a siginicant issue for sub woofers.

    In most rooms there is significant 12 - 18 db room gain below 50 hertz so the issue of extension is not so crucial to me, more over the total response flatness and low distortion.


    Please note I am by no means an expert, this is just what I have come across and learnt in practise.

    I hope this helps

    Ian

  3. #3
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    Last edited by 4313B; 04-22-2003 at 06:06 AM.

  4. #4
    Senior Member MikeM's Avatar
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    Loading 18" 2245 subs

    check this out for a diffrent point of view. ( Instead of refigerator sized cabnets)
    www.passdiy.com
    Von Schweikert VR-8
    Canary Ref. 1 300B monoblocks. 300Bx16

  5. #5
    Senior Member Ian Mackenzie's Avatar
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    Hey Yeah,

    Apparently he blew one of those 24" driver at a party!!! with an Xseries 1000 watt amp.

    Why not consider the CLAW.

    Ian

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