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  1. With your theory on the floor bounce look at the...

    With your theory on the floor bounce look at the direct listening distance and then the distance if a sound wave bounces off the floor midway along the direct listening distance. That second longer...
  2. I had a look at Robs simulation. Behind the...

    I had a look at Robs simulation.

    Behind the scenes your 2351J has an impedance in the enclosure.
    I donít know if enclosure is seal, open back or vented.
    But that impedance and the 6 dB bandpass...
  3. When you say the bottom end what frequency is...

    When you say the bottom end what frequency is that?
    What is the crossover frequency and slope of the 18 inch and the 10 inch driver?
    I pic would help as l donít recall the baffle.

    An educated...
  4. Standard practice is to start with 1 inch fibre...

    Standard practice is to start with 1 inch fibre glass insulation on all surfaces except the front baffle.
    The fibreglass actually absorbs sound.

    Do not use other materials such as carpet under...
  5. All the background on the 2231A-2235H and the...

    All the background on the 2231A-2235H and the 4350 is in Donís History of JBL article.

    None of this information is hard to find. You just have to want to find it.

    If you look in the Jbl 5235...
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    1. Correct. 2. One First Watt B4 (stereo 2 way)...

    1. Correct.
    2. One First Watt B4 (stereo 2 way)

    The active crossover functions to split the line level audio signal after your preamplifier between two stereo power amps into seperate frequency...
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    Hi there and welcome to the forum. I am also a...

    Hi there and welcome to the forum.

    I am also a local in Melbourne and happy to offer guidance on your new acquisition.

    You have quite a shopping list and that is the right approach.

    To...
  8. If you like it leave it as is.

    If you like it leave it as is.
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    https://manuals.harman.com/JBL/HOM/Technical%20She...

    https://manuals.harman.com/JBL/HOM/Technical%20Sheet/L15%20ts.pdf

    https://reconingspeakers.com/product/jbl-033-034-aftermarket-diaphragm/

    It depends on what your aim is?
    You could replace the...
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    Here are some reference threads to get your head...

    Here are some reference threads to get your head around the options.
    Looking at the crossover network as a starting point check what horn you have? If itís the short horn then your looking at a...
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    For some who own a collection of Jbl drivers past...

    For some who own a collection of Jbl drivers past and present such as the 2216nd then they might play around with the idea just for grins. With a dsp based active crossover it might be possible to...
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    Nice pic Todd, Back to the first post...

    Nice pic Todd,

    Back to the first post questions .

    Dual woofers will demonstrate more authority than the same single woofer
    In the case of the 4350 the woofers bandwidth is also deliberately...
  13. Indoor measurements for loudspeaker design are...

    Indoor measurements for loudspeaker design are very limited. You canít do meaningful power response measurements.

    So donít expect much.

    If you have a car port try a ground plane measurement...
  14. Those results are consistent with the drivers of...

    Those results are consistent with the drivers of that era.

    The 2216nd-1 is a very low distortion driver. If you do a ground plane measurement on your drive way it might be more revealing of the...
  15. Your right it will image better out from the...

    Your right it will image better out from the wall.

    If you want to get fussy there are some interesting baffle diffraction modelling programs that predict the midrange response of the driver...
  16. Its entirely up to you what you end up doing. ...

    Its entirely up to you what you end up doing.

    However, with the 2397 as wide as it is (660mm or 26 inches wide ) I would shoot for an external enclosure what wide....
  17. Its entirely up to you what you end up doing. ...

    Its entirely up to you what you end up doing.

    However, with the 2397 as wide as it is (660mm or 26 inches wide ) I would shoot for an enclosure of that width....
  18. Another approach is to pick the minimum...

    Another approach is to pick the minimum acceptable enclosure size for the driver and tune the system in accordance with a maximally flat alignment.

    Then apply low frequency EQ using either a...
  19. In the diy space you have freedom to select your...

    In the diy space you have freedom to select your own enclosure alignment.

    There are no cost, aesthetic or marketing constraints.

    A properly tuned bass reflex enclose will only differ in bass...
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    Have you trialed that woofer in your listening...

    Have you trialed that woofer in your listening environment?

    You are making too many assumptions in an attempt to settle on a design before you cut timber.
    It doesnít work that way. You canít...
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    Hi Olaf, If you have a look at the DD67000...

    Hi Olaf,

    If you have a look at the DD67000 user manual and specifications JBL specify the mid woofer should be placed on the inside for correct imaging.
    JBL also mention the system can be used...
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    You can easily determine this with a modular...

    You can easily determine this with a modular loudspeaker project.

    That said the sensitivity to a variation in the distance between left and right drivers is going to increase where the listening...
  23. If you are going the 2216ND-1 route that all...

    If you are going the 2216ND-1 route that all makes sense.

    Btw there is a lot of opinions across all this diy Audio space. One mans paradise is another mans nightmare!!
    I used the 2397 for years...
  24. If you want to try this l can post the schematic....

    If you want to try this l can post the schematic.

    To attempt a passive crossover at 5000 hertz for both the horn and the Fostex would be quite complicated in this diy situation and would cost you...
  25. In the short term you could improvise by moving...

    In the short term you could improvise by moving the Fostex crossover point out to 9000 hertz and use a 3rd order high pass filter like Jbl used for the 2405 slot radiator.

    The horn does not need a...
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