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  1. Thread: KM2

    by Ian Mackenzie
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    158
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    9,694

    The point is if you are going the diy route you...

    The point is if you are going the diy route you are more likely to achieve the optimal bass response with some low frequency EQ using a 2216nd woofer. Being reliant on enclosure placement with a...
  2. Thread: KM2

    by Ian Mackenzie
    Replies
    158
    Views
    9,694

    The M2 is a equalised bass reflex system. The...

    The M2 is a equalised bass reflex system. The K9900 and the DD67000 are not.

    The later rely on the proximity of room boundaries to augment the bass extension and bass output below 100 hertz. The...
  3. Thread: KM2

    by Ian Mackenzie
    Replies
    158
    Views
    9,694

    Some of the ScanSpeak dome tweeters have...

    Some of the ScanSpeak dome tweeters have sensitivity of 95 dB. If you attenuate the horn back this this alternative would work. A small diameter dome or a ring radiator type with dimple will have...
  4. Thread: KM2

    by Ian Mackenzie
    Replies
    158
    Views
    9,694

    Joseph Crowe has 600, 800, 1200 and some uHF horn...

    Joseph Crowe has 600, 800, 1200 and some uHF horn designs.

    Design of a truly great 2 way system is in fact more difficult if better results are to be obtained than a 3 or 4 way system.

    This is...
  5. Thread: KM2

    by Ian Mackenzie
    Replies
    158
    Views
    9,694

    18Sound also has a very good be driver if you...

    18Sound also has a very good be driver if you want to go Be.

    There was a review in Voice Coil a pro loudspeaker industry journal comparing a Radian Be driver to a Radian Ai driver. They both...
  6. Thread: KM2

    by Ian Mackenzie
    Replies
    158
    Views
    9,694

    There are some very good alternatives for uhf. ...

    There are some very good alternatives for uhf.

    If you need high sensitivity look at some small Heil drivers or Ribbon drivers.
    Fostex make some small horn UHF but they are expensive and may not...
  7. Thread: KM2

    by Ian Mackenzie
    Replies
    158
    Views
    9,694

    One of the biggest mistakes you can make buy...

    One of the biggest mistakes you can make buy coming here is to draw conclusions or predict outcomes of a proposed loudspeaker project based a observations of a Jbl commercial system.

    Jbl makes a...
  8. There is a significant time / phase discontinuity...

    There is a significant time / phase discontinuity with the woofer and the 2397 compression driver abs the 2405. That can be a potential problem on certain types of program material.

    I used the...
  9. Greg Timber’s advice is to use a 3rd order...

    Greg Timber’s advice is to use a 3rd order electrical filter on the 2405 per 3144 schematic. I would look at the Jbl 3107 passive crossover for clues.
  10. Your just going to have to try it yourself

    Your just going to have to try it yourself
  11. Have a talk to Rhob who recently did a passive...

    Have a talk to Rhob who recently did a passive monitor thread

    I have not tried my M2 horns yet.

    What you will find is that the passive compensation will require some tweaking to get it to your...
  12. I think the action is with this press release....

    I think the action is with this press release. The margins and the demand is with the integrators.
    JBL basically destroyed the DD67000 market and the product with stupid distribution and pricing...
  13. Yeah l got 31Lt tuned to 59 Hertz (per driver)...

    Yeah l got 31Lt tuned to 59 Hertz (per driver) but that is only a simulation. So you might be looking at 62 Lt for two drivers with Fb 59 hertz as a starting point.
  14. The TL parameters will guide you on the enclosure...

    The TL parameters will guide you on the enclosure loading.
    Otherwise look at how Jbl used this driver.

    All loudspeaker have TL parameters regardless of design. DDD is a marketing idea. There are...
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    That pretty much makes you a national treasure.

    That pretty much makes you a national treasure.
  16. If you search the www you will find an updated...

    If you search the www you will find an updated list of JBL TL parameters.

    The more practical and useful approach is to use the REW free download software to measure the driver response. What you...
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    Great post. Ian

    Great post.

    Ian
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    The thing is will that size enclosure fit in with...

    The thing is will that size enclosure fit in with the down sized situation and WAF?

    This is where l admire JBLs marketing department.

    Big enclosure and lots of cables is not going to impress...
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    I heard a pair of bi amped 4331 monitors at Greg...

    I heard a pair of bi amped 4331 monitors at Greg Timberís Biamped with stock drivers using one of my analogue active crossovers. We were quite impressed after some tweaks to the in room response.
    ...
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    Actually only removal of the dust cap and...

    Actually only removal of the dust cap and replace.

    All the options are entirely up to you and what you feel comfortable with.

    My suggestion was to keep it was simple as possible. The idea of...
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    The 4333 is what it is. Compared to the 4355...

    The 4333 is what it is.

    Compared to the 4355 it’s not as accurate or as sensitive.

    If you only play pop or rock it’s fine.

    The main problem is the mis match of the woofer and the horn...
  22. Every tip helps. Nice

    Every tip helps.

    Nice
  23. Have you looked at the Array 1400 Series...

    Have you looked at the Array 1400 Series featuring the LE14H-3 with an enclosure volume of 3.2 cu ft3 and 31 hertz tuning.

    Jbl in particular Greg Timberís know a thing or two about setup a driver...
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    Hi Rob, Thatís a good point. In production...

    Hi Rob,

    Thatís a good point.

    In production these EQ curves will have limits put on them and bandwidth limiting filters to avoid excess sub sonic gain. That will all be worked out in product...
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    I am not familiar with your enclosure plans ...

    I am not familiar with your enclosure plans

    One way of checking your in the ball park enclosure size is this:

    Your enclosure internal dimensions give you a gross enclosure vol in cu ft.

    If...
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