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  1. Replies
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    Hey Lasse, If you adjust total portarea to...

    Hey Lasse,

    If you adjust total portarea to 150cm2 you can expect this bassextension and midrange on-axis response. On floor, against rear wall. Unfortunately it is not possible to run the sims at...
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    47,605

    I have an acceptable knowledge in using HR and...

    I have an acceptable knowledge in using HR and can also interpret the results. Input needed is:

    Driver
    At
    Am
    L
    T if Hypex
    Backchamber volume
    Placement
  3. Replies
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    47,605

    So, now only plans for the Waldorfs are...

    So, now only plans for the Waldorfs are missing....
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    47,605

    Hi again Lee, Thanks! I know the original...

    Hi again Lee,

    Thanks! I know the original Imperial very well and have the plans, never heard of the Jensen/Waldorf though. Same, same?
  5. Replies
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    47,605

    Hey Lee, Would you mind helping us with the...

    Hey Lee,

    Would you mind helping us with the drawing/plan? Or is this the original:
    ...
  6. Replies
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    A 480Hz(like Yuichi flare) exponential adapter...

    A 480Hz(like Yuichi flare) exponential adapter should be 1,4cm long. If the horn for example is Hypex=0,6, it should be 2,1cm. If making it that thick wood should be no problem.

    What is...
  7. Replies
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    Hey Audiophile, If you are going to use this in...

    Hey Audiophile,
    If you are going to use this in home system you shouldnīt count on a XO-frequency higher than 4-500Hz from the 4560/2225. So you will need a horn and driver that does this. 2"?
  8. Replies
    31
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    39,109

    Hey Byron, If you decide to keep the original...

    Hey Byron,
    If you decide to keep the original volume you can change the port-area to get a better compromise. Go for a total of 400cm2, ie 100cm2/port, when placed rearwall/floor(1*Pi). If going for...
  9. Replies
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    Hey Grumpy, Thanks a lot, will do some new...

    Hey Grumpy,

    Thanks a lot, will do some new sims. Assumed it was VAS but didnīt care to use the std formulas to find out:o:.

    By the way JBL are one of the few manufacturers that(normally:)) has...
  10. Replies
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    39,109

    Hey Rob, The hornreflexes(A7, 816, 4560, 4520...

    Hey Rob,

    The hornreflexes(A7, 816, 4560, 4520 etc.) are very hard to handle as they are big compromises. You get shelving as as the horn has higher sensitivity. Also you get phase problems,...
  11. Replies
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    39,109

    The 40Hz peak is not a room-resonant, itīs the...

    The 40Hz peak is not a room-resonant, itīs the ports resonance. By changing port-area it can be moved around a little, but also affects low-end drop. The dip at ca 70Hz is also due to 4560īs design....
  12. Replies
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    This is Imperial/K130 in 1,0*Pi. At the bottom...

    This is Imperial/K130 in 1,0*Pi.
    At the bottom 1*2240/Imperial 1,0*Pi.
  13. Replies
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    97,037

    This is what to expect in 1,0*Pi with a chamber...

    This is what to expect in 1,0*Pi with a chamber volume of 80dm3.
  14. Replies
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    8,251

    That TAD did them this way isnīt a guarantee they...

    That TAD did them this way isnīt a guarantee they are made perfect. Why copy, find out if they can be made better instead.

    A 290Hz horn is usually crossed over at about 2*Flow( Altec 515 is 270Hz...
  15. Replies
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    So true. Unfortunately we will have an extremely...

    So true. Unfortunately we will have an extremely abrubt transition horisontally in Dingusboys radialhorn. So one should take take a closer look at 2328 where this has been delt with like it should. ...
  16. Replies
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    Why not go for the same flare in the adapter as...

    Why not go for the same flare in the adapter as the horn as this would probaly be the smoothest. This is easily calculated as At and Am is known and should theoretically be close to 1,5" length for...
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    As you see above it has a flare of about 600Hz.

    As you see above it has a flare of about 600Hz.
  18. Replies
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    OK, lets start again. Did you mean a 1" thick...

    OK, lets start again. Did you mean a 1" thick adapter for a 2" driver on 2397?

    Flare again;). If we consider your adapter as being with an exponential progression it has a flare of just below...
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    This is how JBL adapts 1" drivers to 2397. As the...

    This is how JBL adapts 1" drivers to 2397. As the adapter is short we can assume it has a higher frequency flare.

    52018

    And this Mr. Widgets idea, probably you will loose bottom end but gain...
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    Never said it that way either.

    Hey Ruediger,

    OK, but "may" could go for any horn, good or bad. Still in my opinion the best horns for HiFi today are with the same flare all the way. About the biradials I donīt know as I...
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    Hey Ruediger, 1st So a horn shouldnīt have...

    Hey Ruediger,

    1st So a horn shouldnīt have the same flare from throat to mouth? Totally disagree or is this a missunderstanding?

    2nd Would have been interesting to see the original prototype...
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    Hey Ruediger, Off course you can mix but to...

    Hey Ruediger,

    Off course you can mix but to get an optimal result an uniform flare all the way is the way to go. About 2397 style horns I think it is a big mistake to addd the driver directly to...
  23. Replies
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    Found the picīs of a conversion I did for fun to...

    Found the picīs of a conversion I did for fun to the 511, 2328 and 2" driver. Still havenīt tried them though.

    It is not completely correct as the 2441 is 180Hz, the 2328 160Hz and the 511 270Hz.I...
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    Hi Lee, You are probably right in that the air...

    Hi Lee,
    You are probably right in that the air speed is so low that the flow is almost absent. Still in low speeds like in the Tornado catamaran I used to sail, rudders worked best when matted(?)...
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    The thing you draw in post 16 is totally wacko....

    The thing you draw in post 16 is totally wacko. If you want to add a 1" to 2" adapter let it be 160Hz and something like 200mm long. If you make it 400Hz(like most 1" drivers flare) it should be...
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