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Thread: Unusual Speaker Designs

  1. #21
    mf Mezzo-Forte Nutball's Avatar
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    The desired effect is to not have potentially unwanted sounds caused by running a wide frequency range through only one size of resonator. Using only one might be another way to get a desirable sound, but not in all cases. It would be like using one size pipe for every note in a pipe organ within what is possible.

    And yes, the crossover points are dependent on the desired effect, so don't ask for them unless you know what effect you want.
    Allen 530A

  2. #22
    pp Pianissimo KOC62's Avatar
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    I would think that most loudspeaker drivers can handle a couple of octaves, or more. Also, this frequency range is fixed for each respective driver. Thus you will need to select which driver you would want to add to create the enhanced effect. Or, you could add pipes (as you suggested earlier) to narrow the range and where in the audio spectrum it should be. Could be a lot of experimenting and box/pipe cutting sessions for a given home situations. It may even look novel if the aesthetics could also be factored into the final design.

    I suppose one could design a speaker box along the lines of a violin, or guitar - i.e. utilize their resonant elements but in the range desired and driven by a loudspeaker. The "tuning" may take some experimenting. This too is much along the lines of "formant" filtering.

  3. #23
    ff Fortissimo toodles's Avatar
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    Quote Originally Posted by KOC62 View Post
    I would think that most loudspeaker drivers can handle a couple of octaves, or more.
    Right, which is way a 3-way makes a lot of sense to cover the full audio spectrum--3 octaves each times 3 gets you 9 octaves from 32 Hz to 16 kHz. There has to be some overlap, of course, since crossovers don't cut off, but roll off (thank goodness, or talk about phase problems!).

    Laminated core and ferrite core inductors can saturate, meaning that at high power they can distort. Air core inductors won't saturate, but the resistance can pose problems, so large gauge air core inductors are the best option (like Allen uses). Copper is quite expensive.

    If you think you've come up with a great new idea, it's probably been considered before. The commercial implementation of this speaker idea was the Wurlitzer Brasshorn--a compression driver that came with a trumpet and a trombone horn. It could probably break ear drums. See: http://farm3.static.flickr.com/2703/...38d7c7c353.jpg

    [Tongue firmly planted in cheek] as you know this was a huge commercial success since every electronic organ installation uses one of these!

    One of the problems with filtering acoustically with the speaker system, is that it wastes power, and power has never been exactly cheap.

    One of the early electronic organs filtered (electrically) after amplification. Talk about wasting power!

    Anyone who wants to try any of these sorts of schemes might well give their excess money to charity. At least it won't be wasted.

  4. #24
    mf Mezzo-Forte Nutball's Avatar
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    I've even thought each real string pipe should have its own wooden resonator to add extra realism with a little close to the source reverb. But, yes I was thinking more of the same driver through different pipes where necessary vs different drivers (woofer, sealed mid, tweeter). I figure if you go with a bold enough version of speaker box you want you shouldn't need to tune too much, you will get the desired general change in sound. During assembly you might run each speaker/pipe combo on a frequency sweep to determine where you want the crossovers set.

    At least in the home setting power isn't much of an issue since you can get away with just a few watts of power for sufficient volume. That way you don't need huge amps, you can have lots of losses, and iron core coils will not saturate, so all should be good?
    Allen 530A

  5. #25
    pp Pianissimo KOC62's Avatar
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    Quote Originally Posted by Nutball View Post
    ... and iron core coils will not saturate, so all should be good?
    Iron core coils will saturate (at about 1.6 Tesla). The iron can only take a limited amount of magnetic flux.

  6. #26
    ff Fortissimo toodles's Avatar
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    Quote Originally Posted by KOC62 View Post
    Iron core coils will saturate (at about 1.6 Tesla). The iron can only take a limited amount of magnetic flux.

    Exactly--only air core won't saturate because the core (air) is not magnetic.

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