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Thread: D'oh! Hate it when you lose a thread

  1. #1
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    D'oh! Hate it when you lose a thread

    Once, while looking for something totally unrelated, I saw a Subject on a post related to splitting bass across two woofers. I assume it was to have one handle only the very low end and the other to handle mid-bass. This seems like an extremely good idea to me, and one that you would not be able to accomplish without introducing a computer into the mix. However, after every search term I could think of, I can't find the )#$*! post. Is the poster still an active user? Does anyone know what I'm talking about? Can you point me to the thread or tell me what was discussed on the topic?

  2. #2
    Raw Wave
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    Did you try using google with mp3car (or site:mp3car.com - whatever google's syntax is) followed by keywords? (Forum search engines are notoriously lacking or bad.)

    The only reason I would see for splitting bass would be for 2 different woofers each with their own sweet spot, otherwise there is no point. (If higher frequencies, location might be another factor).

    The splitting would either be with high-power filters, else at the pre-amplifier stage using 2 amplifiers.

  3. #3
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    Again I say D'oh. I'll try the google idea. As for the point, the theory (in my head, without actually looking in to the science) would be that you are reducing the range each speaker has to travel by reducing the amount of the audio spectrum they cover, thereby cutting down on distortion and allowing more power to each portion. *shrug* plus it seems neat.

  4. #4
    Raw Wave
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    Yeah, I thought so. But think about it - your favorite headphones or single speaker system - does it distort over a wide frequency range (provided the signal isn't outside its spec)?


    It's only one cone. It does not do each individual frequency (sinusoid) it gets, but the sum or them. Does that make sense?
    If not, imagine a pure 1kHz & 2.5kHz source - ie, 2 sinewaves. They add up to make a unique "curve" and that's the curve the cone puts out. Same with music etc and all its component frequencies - they all sum to make a single amplitude at any point in time.

    Two same speakers each with its own split-frequency source will not be any cleaner than each speaker handling the full total source.
    In fact int practice it will be worse because of non-ideal filters (roll-off characteristics and phase changes) and having 2 sound sources instead of one - ie, you have to point both at your ear, and once you move...

    The only time they split speakers is for a better overall sound. That can be into woofer, mid & tweeter because it is mechanically easier to specialise each size. Or because high-frequencies have to be directed "at the ear" and it may be difficult to mount a 6" or 12" etc all-frequency speaker, hence cars where a small high-mounter tweeter can be on the A-pillar etc an pointed at your ear whereas the less directional and larger mids can be more off angle (eg, lower doors) and the almost non-direction bass or huge sub can be anywhere - under the seat or behind you.

  5. #5
    MySQL Error soundman98's Avatar
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    splitting/manipulating audio isn't a drastically new idea, and is completely possible without a pc, though there are some aspects that a pc makes it easier..

    oldspark is correct in terms of the benefits of splitting the audio between 2 of the same size woofer-- there is no real benefit. it's like installing 2 motors in a car, one to handle acceleration from 0-3000 RPM, and another motor to handle acceleration from 3000-6000 RPM. if both motors are capable of 0-6000 RPM, why not just use a single motor, and then reduce the needed space and extra weight of having 2?

    as far as how to do it without a pc, look at electronic crossovers:
    http://www.sonicelectronix.com/cat_i60_crossovers.html

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