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  1. #1
    Senior Member Guido's Avatar
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    2203 Subs

    I found 2 NOS 2203 recone kits. As I know I can put them into K120, E120, 2202, 2204, 124 and of course 2203 baskets. I'll look for them. Are there any other baskets that fit?

    I want to use them in Subs together with my 4313B DIYs. What do you think?

    Regarding the dimensioning of the subs I found two interesting posts from Giskard:

    1)
    The 2204 can be reconed as a 124/2203 but i'm not sure about the 2206. The 124/2203 works great in a 2.5 - 3.0 cubic foot enclosure tuned to 30 - 32 Hz. In a 2.0 cubic foot enclosure tune to 26 Hz or 40 Hz and see which you prefer. The old JBL tuning frequency for this transducer was 26 Hz but in practice that was usually way too low. The Qts is extremely low at 0.14 (which hints at it's extremely powerful motor).

    The old JBL enclosure chart had the following two recommendations for the 124/2203:

    1.6 to 2.0 cubic feet with a 3" (7 sq in) port having a 8" duct
    2.1 to 3.0 cubic feet with a 3" (7 sq in) port having a 5" duct

    In both cases the Fb was ~ 32 Hz which wasn't in agreement with the user's guide which was, as previously stated, 26 Hz.

    2)
    I've built a significant number of 124/2203-based subs and the best combo I have found is 2.8 cubic feet tuned to 30 Hz.


    Is there a need for active Bass EQ as lot of the subbass modules provide?

    Any recomendations for using them together in on cabinet?

    Any help is appreciated. Thanks!

    BLS Reference on Passlabs XA 30.5 + Everest DD66000 clone on Pass XA 100.5

  2. #2
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    "I want to use them in Subs together with my 4313B DIYs. What do you think?"

    Been there, done that, good idea.
    2.8 cubic feet tuned to 30 Hz.

    "Is there a need for active Bass EQ as lot of the subbass modules provide?"

    Absolutely not. The response is rock solid down to ~ 30 Hz. A high pass filter set in the 20 to 30 Hz range will protect the transducer below resonance thereby increasing mechanical power handling.

    "Any recomendations for using them together in on cabinet?"

    I would keep them in separate sub enclosures within the main enclosure with their centerlines as close together as possible and probably angle them out like many center channel loudspeakers are arranged. Running them that way in parallel will increase their maximum SPL by ~ 6 dB.

    "I found 2 NOS 2203 recone kits. As I know I can put them into K120, E120, 2202, 2204, 124 and of course 2203 baskets. I'll look for them. Are there any other baskets that fit?"

    I'd personally use 2202H or 2204H baskets. Long ago, in another time, it was easy to get 124H's and 2203H's but then the gravy train dried up. Back in the late 80's JBL notified me that they had a large number of 121H baskets available for $20 a pop. I bought a significant number of them, reconed them as 2203H's and used them in custom sound systems driven by Adcom GFA amplifiers. I sold my very last pair a few years ago. I can't imagine what I must have been thinking at the time, except that maybe having a dozen different subs sitting around doing nothing was somehow a bad thing.

  3. #3
    Senior Member Guido's Avatar
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    Quote Originally Posted by Giskard
    Absolutely not. The response is rock solid down to ~ 30 Hz. A high pass filter set in the 20 to 30 Hz range will protect the transducer below resonance thereby increasing mechanical power handling.
    .........
    Running them that way in parallel will increase their maximum SPL by ~ 6 dB.
    Sounds like a killer system
    BLS Reference on Passlabs XA 30.5 + Everest DD66000 clone on Pass XA 100.5

  4. #4
    Senior Member Guido's Avatar
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    Red = 2,8 qu ft, tuned to 30Hz
    Green = 1,8 qu ft tuned to 31 Hz (3" port, 7" duct)
    Yellow = 1,8 qu ft tuned to 31 Hz (3" port, 7" duct) with Submodule Bass EQ

    Hhhmmm
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    BLS Reference on Passlabs XA 30.5 + Everest DD66000 clone on Pass XA 100.5

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    Don't forget your low pass filters when looking at subs.

    If you are looking for more extension (and poorer transient response, power handling, and group delay) then use a 6th order alignment.
    Use your 5234A set to bump at 20 Hz and tune your enclosure to 20 Hz.

    Red = 2.8 cubic feet tuned to 30 Hz with 2nd order Butterworth low pass at 80 Hz.
    Grn = 2.0 cubic feet tuned to 20 Hz with 2nd order Butterworth low pass at 80 Hz and 2nd order high pass at 20 Hz (Q=2).
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    Senior Member Guido's Avatar
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    Clear Giskard,

    thanks for help.

    I do not necessarily look for more extension but need amps anyway and thought with the bass EQ of those sub modules I can keep the cabinets smaller.
    They should somehow "fit" to the 4313.
    BLS Reference on Passlabs XA 30.5 + Everest DD66000 clone on Pass XA 100.5

  7. #7
    Senior Member Ralf's Avatar
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    Quote Originally Posted by Giskard
    Don't forget your low pass filters when looking at subs.
    Hi Giskard,

    how can I setup the filter parameters in BBP?

    I`ve tomatos on my eyes....
    16 Hz can not be substituted

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