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Thread: 2 subs in one box, or 2 subs in 2 boxes

  1. #11
    Super Moderator. If my typing sucks it's probably because I'm driving.... turbocad6's Avatar
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    did you ever stop to think that if you blow both subs that had they been seperated only one would have blown? when the first one goes the second one looses all it's suspension if they share there space.... at the same conditions that caused the first to blow the second is only seconds behind in it's shared fate....I have never blown two subs at the same time, but I have blown a few subs

  2. #12
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    if anyone has ever used a high-end RTA, shared-chamber means you need to run mono. You would have less clean separation (i.e. Left-Right). if you are into SQ, you SHOULD separate the chambers. If needed, two sep. boxes only takes up an inch or two.

  3. #13
    Super Moderator. If my typing sucks it's probably because I'm driving.... turbocad6's Avatar
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    I can't imagine anyone having the ability to calculate & build an enclosure not having the ability to also divide it, but stereo seperation wouldn't be a factor for two subs located in a trunk or rear of vehicle...these will be cut off low enough that there should be no audiable localization, meaning you'd never be able to distinguish left from right anyway......

    the only time it may be remotely acceptable to me to use a common chamber is if both subs are run off a single channel.... even then I'd rather seperate for reasons already stated, but if the subs are run off two different channels it should be considered a performance advantage to seperate..... it's 1 extra divider that will also stiffen the enclosure, I still see no reason not to.... & several advantages in doing so.......

  4. #14
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    audio has a strong point, but it does come down to wiring. Running speakers in series has a cross-over effect due to the speaker itself... Think about it. What is a speaker but a great big coil. Coils in series are the beginning of a crossover. This means that the first speaker in the chain will slightly modify the signal heading to the second speaker, etc etc etc.

    The same holds true theortetically for speakers in parallel, but thats a joke statement.

    So yes, if you ran in series, I would advise seperate enclosures. If you ran in stereo i would advise seperate enclosures and unless you are confident that each speaker has the exact same dampening charecteristics, I would run in seperate enclosures. Do i think you could tell the difference? Nope

    The point of a blown woofer does make sense. Maybe a manufacturing defect, or a blown channel on the amp caused a DC spike. With seperate enclosures you would still be up and running.

  5. #15
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    I really can't tell any difference between the two versions...maybe with high end systems it indeed makes a difference.

    In terms of wirring and woodwork, I find it as easy either way...
    When I build 2 sub enclosures with a mono amp out of wood, I usually make separate boxes and place the amp in between the two, recessed. Looks good beeter, than just bolting the amp on the enclosure, with all the wirring in sight...

  6. #16
    Super Moderator. If my typing sucks it's probably because I'm driving.... turbocad6's Avatar
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    Quote Originally Posted by Will Albers
    Running speakers in series has a cross-over effect due to the speaker itself... Think about it. What is a speaker but a great big coil. Coils in series are the beginning of a crossover. This means that the first speaker in the chain will slightly modify the signal heading to the second speaker, etc etc etc.

    I don't think this is correct, afterall you should realize that a crossover will work with it being in either the + or - side of the circuit, therefore each sub will have a coil in series to it.... one before, or + & the other after or - side of circuit..... if both subs are in series they will be running the same signal.... there still can be mechanical differences even between two same subs though

    bottom line, there are defanatley benifits to seperating..... the only benifit to not seperating seems to be slightly less labor in construction, if even that


    SOOOOOOOOOOO.............

    Quote Originally Posted by tc6
    ..... keep them seperate

  7. #17
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    the crossover issue is really neat actually, and becomes a huge factor in home audio.

    to fill in where will left things off, every subwoofer has its own measured inductance, shown as T/S parameter Le. all Le is is the inductance of the coil.

    now, rather than suggest that the inductance of the coil acts as a crossover to the rest of the circuit (which it really does, though less predictable as the crossover itself), we can REALLY say it acts as an effective crossover for itself!

    so every speaker has a built in 6 dB highpass crossover! neat!

    but does it really affect us for in car performance? well, a quick scan of WINISD, and I didnt really find any drivers in there that were much above 3mH. but lets say we found a driver at 4 mH. thats a pretty huge inductance!

    its only gonna filter our speaker starting at 150 Hz who runs their subwoofer that high? noone I know!

    so inductance isnt really a factor for in car box design.

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