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    subwoofer enclosures.

    Toying with the idea of running 4 12" subs in the Ranger (love my 2 10's but want more).

    Dont really have the room to go 4 wide due to needing to also fit a battery in each side of the box.

    Can however go 2 top firing and 2 bottom firing.

    Any reason why this would not be ok, sealed obviously not ported.

    Possibly even do an Isobaric enclosure but thats a bit of a cunt.


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    #2
    2 top and 2 bottom is an ideal situation, they sort of balance each other out. Best if you can squeeze middle solid brace to make it essentially 2 boxes, but that is only to rule out minor differences in the woofers, and to stop a tuned pipe effect - boxes multiple times long in one direction can have some interesting, unpleasant resonances.

    try and get 60mm clearance on the bottom side if possible.
    "And I know that arseholes grow on trees but I'm here to trim the leaves" Peeping Tom, Mike Patton

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      #3
      Originally posted by pH@tTm@N View Post
      2 top and 2 bottom is an ideal situation, they sort of balance each other out. Best if you can squeeze middle solid brace to make it essentially 2 boxes, but that is only to rule out minor differences in the woofers, and to stop a tuned pipe effect - boxes multiple times long in one direction can have some interesting, unpleasant resonances.

      try and get 60mm clearance on the bottom side if possible.
      Ohhh yes, it would be 4 separate enclosures (2 up / 2 down), never a fan of running multiple subs in the same air space.

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        #4
        isobaric with 4 drivers will be no louder than 2 drivers and require twice the amp power so that idea is out if all you care about is SPL. The advantage of isobaric is that the enclosure internal volume can be halved, so you get the SPL capability of 2 drivers by using 4 drivers and only need the enclosure internal volume to satisfy 1 driver. Ultimately the enclosure probably ends up similar in size to a normal 2 sub enclosure due to the extra internal baffles, drivers, chamber between the internal and external drivers etc so is generally a waste of time unless you happen to have 4 subs lying around that require such a huge enclosure that you couldn't fit and enclosure suitable for 2 of them.

        If going with 2 firing up and 2 firing down ideally you should make sure that they have similar breathing space top and bottom, otherwise the pairs of drivers may not be balanced at certain frequencies, causing a pair to hit excursion limits before the other pair. This is because if for example the bottom pair only had a tiny gap between them and the floor, they'd 'see' that small gap as an extra chamber between them and the cabin, effectively becoming a 4th order bandpass enclosure instead of simple sealed enclosure. Either make sure the gaps top and bottom of the enclosure are equal, or if unequal that both top and bottom have ample breathing space. If you're fitting it under a seat consider that the seat may be partially transparent to bass frequencies so having a gap under the seat and an equal gap to the floor may not be acoustically equal. In that case I would think that two up and two forward is probably a better bet.

        edit: the above is still of some concern even if all the sub enclosures are separate, because they are common to the cabin which can become sufficiently pressurized at high volume.
        Last edited by TMM; 09-05-21, 10:34 PM.

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