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    Double Slit Interference or Interferenz am Doppelspalt is the reason for the lobing

    The slit is a simplification here, it shows the problem in one plane instead of two. There is also an article in Wikipedia about "Acoustic Lobing".


    Consider two drivers, each sending soundwaves....
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    Cone kit goes into frame list - or simply "goes into list" - ...

    ... - this list (available from JBL) says the cone kit C8RE140 goes into the frames E140-8 and K140 as well.

    Ruediger
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    Here comes a write-up

    See this thread in this forum:

    http://www.audioheritage.org/vbulletin/showthread.php?26529-E-140-dust-cap-replacement-advice-please&highlight=E+140+dust+cap+replacement%2C+advice+please

    Ruediger
  4. Thread: Jbl-selenium

    by Ruediger
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    Some of the woofers have Q-values ...

    ... which make them unusable for vented boxes.

    ruediger
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    Thiele Alignments 3 and 4

    Why don't you start with Thiele alignments 3 and 4 and interpolate between the two? You will need to adjust Qt. For this you need to take into account the crossover inductor's DC resistance of the...
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    Your dog may be underemployed

    If your Malinois messes up your flat then this may be an indication of underemployment. The Malinois is much more agile and demanding than a normal German Shepherd. If you don't give it employment it...
  7. You need a book

    Leo L. Beranek: Acoustics

    The formula is simple: S = St * x**2, St = throat area, but you need the horn input impedance.

    Ruediger
  8. Thread: Jbl 1200fe-8

    by Ruediger
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    Thiele Alignments 3 and 4 would match

    QB3 Thiele alignment #3 would match if Qt remains unchanged (no passive crossover), and
    QB3 Thiele alignment #4 would match if Qt gets changed (passive crossover).
    Taking these two alignments as...
  9. Thread: Jbl 1200fe-8

    by Ruediger
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    What is the source for Vas of the 1200fe?

    Maybe I am blind: I can't find Vas for the 1200fe

    Ruediger
  10. A few plots of horn behavior

    These two pages are an extract from the book "Acoustics" from Leo L. Beranek.

    Ruediger
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    Thiele Alignment # 1 would be a fit

    You would fix Qt by making it 0.18.
    f3 would be 134 Hz,
    fb would be 100 Hz,
    Vab would be 8.5 ltr.

    Ruediger
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    Design for a single driver 2231 and for a box...

    Design for a single driver 2231 and for a box 3.55 cuft per driver.

    ruediger
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    Understandable YouTube Clip about Wave Motion

    Look for YouTube Clips named "Exploring wave Motion". There is a sequence of 5 Clips belonging to each other. What you need to understand is the diffraction of water waves and the Huygens principle....
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    Bad manners

    Bldozier, your question is trivial and could be answered by many forum members, but nobody does it. Any idea why?

    ruediger
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    requested design theory

    JBL TechnicalNotes Volume I, Number 19 Sub-Bass Systems Using Triple Chamber Bandpass™ (TCB)Technology

    ruediger
  16. Ported Midrange

    The Electro Voice S15-3 had a ported midrange and sounded good.
    Ruediger
  17. How to do it, from D.B. Keele

    From D.B. Keele's website:

    6. "Low-Frequency Loudspeaker Assessment by Nearfield Sound-Pressure Measurement," J. Audio Eng. Soc., (April 1974).

    A loudspeaker test technique is described which...
  18. How did you measure the inductances?

    What kind of measurement gear did you use?

    Ruediger
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    simple solution

    This solution requires two resistors, 1 kOhm or 2 kOhm each. The outputs are added to each other, giving a mono sum signal. The resistors isolate the outputs from each other and are REQUIRED.
    ...
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    If You're reallymad

    http://www.funk-tonstudiotechnik.de/
  21. EMC in Audio Systems, a presentation

    Google for EMC in Audio Systems, then look for IEEE-Tutorial05.pdf

    Ruediger
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    It is 66 micro farad, not 6.6 milli farad

    Together with L2 and R1 it forms a lossy parallel resonance circuit.

    Ruediger
  23. You don't need thick cables but should turn that installation into a 100 Volt System

    "... paired speakers hung up as monitor speakers all over the place ..."

    For each speakerbox you buy a transformer which can handle the power fed into the boxes (5 Watts), not the power the boxes...
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    You don't need the original parts, You even can't get them.

    Forget about the JBL part numbers.

    I think many of the JBL networks have been built (copied) by forum members. The easiest way ist to copy such a network and to use the parts list that comes with...
  25. @ Malefoda: Does Your brother have neighbours ...

    ... in the same house? Bass transmission can lead to troubles. This can limit the allowed playback volume.

    Ruediger
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