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  1. 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.
  2. Your just going to have to try it yourself

    Your just going to have to try it yourself
  3. 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...
  4. 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...
  5. 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.
  6. 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.
  8. 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...
  14. Every tip helps. Nice

    Every tip helps.

    Nice
  15. 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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    What l would do is a physical determination of...

    What l would do is a physical determination of the minimum diaphragm motion to get the true port resonance.

    Use a simple oscillator down load for this.

    According to Greg Timberís woofers with...
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    Attached are some of the voltage EQ and FR curves...

    Attached are some of the voltage EQ and FR curves with the crossover.

    This follows the protocol of measure, test and learn.

    The user can obtain excellent imperial results with a measurement...
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    Btw the above was close to my original thinking...

    Btw the above was close to my original thinking early on.

    Okay this is the thing:

    Because there is a sub out there are two or three options.

    1. Unfiltered sub out for an external self...
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    Thanks

    Thanks
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    Option 2 fleshed out for now. Basic...

    Option 2 fleshed out for now.

    Basic description
    A stereo two way crossover with preset plug in crossover cards with D connectors and front panel level controls.

    The user
    The product is...
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    Hi Rob, Summed mono or stereo sub can be...

    Hi Rob,

    Summed mono or stereo sub can be switched.

    The inclusion of a measurement kit is an option but will be priced as a package.

    In the 1980’s companies like Sony and Accuphase made...
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    If I refer to my earlier post ...

    If I refer to my earlier post

    http://www.audioheritage.org/vbulletin/showthread.php?42350-STOP-PRESS-Bombshell&p=430027&viewfull=1#post430027

    Is this more along the lines of that you would...
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    One thing to appreciate is that at least on this...

    One thing to appreciate is that at least on this site a number of users have adopted either the Rane or the Ashly crossovers.

    I am not sure if that is a user choice or a price decision?

    Only a...
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