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Thread: Recommended Enclosure for a 2240H as HT Sub?

  1. #1
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    Recommended Enclosure for a 2240H as HT Sub?

    Went ahead and picked up a 2240 to get started- not too expensive and I know it can be later re-coned to a 2245 should I require something that goes lower. I like the Idea that the 2240 may be punchier and more dynamic- and do not see the need to go below 30hz and there is room loading to consider and we have a lot of glass windows/doors here...

    Room size is roughly 22' x 16'. Main viewing/listening couch will be about center- 11'-12' from the screen.

    Sub could go in front or behind of couch- probably a rear placement would have more room/out of the way.

    I understand a ported 8 cu.ft. enclosure with a 6" port diameter is a good place to start.

    Was also wondering if it makes sense to have the port down facing to load the floor? Would this room size really require two subs?

    Any thoughts would be most welcome.

  2. #2
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    Frequency range of the sub? Maximum size of the cabinet?

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    Senior Member Lee in Montreal's Avatar
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    You can build a 10cft out of a sheet of 4'x8' and add reinforcement with extra wood. That's roughly 24"x24"'x36"

    I suggest you do your own test using a simulator. Move the Fs around until you get the curve you like.

    You can tune the cabinet to 30Hz for low bass, or 34-40Hz for more audible bass ;-)

    If your cabinet is 12" off the floor, sure you can postion the port downward, but honestly, there's no point. ;-)

    Lee

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    Quote Originally Posted by Lee in Montreal View Post
    You can build a 10cft out of a sheet of 4'x8' and add reinforcement with extra wood. That's roughly 24"x24"'x36"

    I suggest you do your own test using a simulator. Move the Fs around until you get the curve you like.

    You can tune the cabinet to 30Hz for low bass, or 34-40Hz for more audible bass ;-)

    If your cabinet is 12" off the floor, sure you can postion the port downward, but honestly, there's no point. ;-)

    Lee

    I am inclined to a tuning compromise like 35hz- but I will await measurements based on the new HT speakers/placement.
    Thanks Lee!

  5. #5
    Senior Member Lee in Montreal's Avatar
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    10cft - Fs35Hz - 2 x 6" ports - 6" long
    10cft - Fs35Hz - 1 x 6" port - 1.8" long

    10cft - Fs30Hz - 2 x 6" ports - 12.5" long
    10cft - Fs30Hz - 1 x 6" port - 4" long

    You can confirm with a different software.

    If tuning to 35Hz, then cone gets unloaded under that frequency, but you get more content above 35Hz.
    Or you can tune to 30Hz to keep cone control in check, and slightly boost 35Hz region w/ eq

    Personally I would tune the cabinet to the driver's Fs (30Hz) and boost 35Hz if necessary.

    Lee

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    Senior Member spkrman57's Avatar
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    I prefer lower/safer tuning option

    Quote Originally Posted by Lee in Montreal View Post
    10cft - Fs35Hz - 2 x 6" ports - 6" long
    10cft - Fs35Hz - 1 x 6" port - 1.8" long

    10cft - Fs30Hz - 2 x 6" ports - 12.5" long
    10cft - Fs30Hz - 1 x 6" port - 4" long

    You can confirm with a different software.

    If tuning to 35Hz, then cone gets unloaded under that frequency, but you get more content above 35Hz.
    Or you can tune to 30Hz to keep cone control in check, and slightly boost 35Hz region w/ eq

    Personally I would tune the cabinet to the driver's Fs (30Hz) and boost 35Hz if necessary.

    Lee
    You won't lose much doing the lower tuning and the 2240 will be happier. Now if you had 2242s!!!!!!!

    Ron
    JBL Pro for home use!

  7. #7
    Senior Member Lee in Montreal's Avatar
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    Quote Originally Posted by spkrman57 View Post
    You won't lose much doing the lower tuning and the 2240 will be happier. Now if you had 2242s!!!!!!!

    Ron
    Ah, ah, ah. I think it is time we give the 2240 the recognition it deserves ;-)

    Lee

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    The room will affect how the sub sounds. So read up on room gain. diyaudio.com has a lot or information.

  9. #9
    Senior Member Val's Avatar
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    I went with 12 cubic feet for my 2245H. I love it.

    http://www.audioheritage.org/vbullet...Woofer-Project

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    So my question is, are there tunable ports available to tune the room?

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    Administrator Robh3606's Avatar
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    Quote Originally Posted by gasfan View Post
    So my question is, are there tunable ports available to tune the room?
    What???

    You can always temporarily install ports of any length. I have done that when I wasn't sure which box tuning I was going to use. I typically use double flared. You just change the spacer length between the inner and outer flare.

    You would not be tuning the room just altering the box for a "better fit".

    Debatable how well it will work.

    Rob
    "I could be arguing in my spare time"

  12. #12
    Senior Member RMC's Avatar
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    There are extendable flanged ports for sale. As i recall Solen had/has one or two models. But these might be prone to air leaks depending on how well they're made?

    I'd be tempted to use modeling clay, temporary and removeable "silicone" or even poster putty to seal between the two moving tubes during your experiments, as well as the joint between cabinet and port tube.

    Richard
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  13. #13
    Administrator Robh3606's Avatar
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    Just use masking or duct tape no need to use a temporary sealing compound

    Rob
    "I could be arguing in my spare time"

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    Quote Originally Posted by Robh3606 View Post
    What??? You would not be tuning the room just altering the box for a "better fit". Rob
    Yea, that's what I'm referring to. Thanks.

  15. #15
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    Just use WinISD and look at the optimum cabinet size and tuning for that woofer. I'm pretty sure thet 2240 is listed in their library. Then look at the largest cabinet that you are willing to accept, let the program select the optimum tuning, and compare that with the optimum size/tuning to see if it's an acceptable alternative. Everything is a compromise of one sort or another. WinISD is free to download. BTW, other than the 2245 for a bit deeper bass, WinISD says that the 2241 is the best alternative and that's what I use..., based on WinISD. The 2241 gives up little in the way of deep bass to the 2245, but has as much more "texture" and volume and can use/will produce better results a smaller cabinet than the 2245. It also gives up some power handling and volume to the 2242, but provides a deeper bass in a smaller cabinet.

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