Multiple Subwoofers in one cabinet...

Discussion in 'DIY Corner - Tips & Techniques' started by christommes, Oct 27, 2005.

  1. christommes Audiophyte

    christommes
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    I recently purchased 8 subwoofers from partsexpress for my home THX system....i built seperate enclosures of around 4 cubic feet for all of them...

    Overall the sound is mindnumbing...but there are occasions where say in jurassic park...the dinosaur is amazing but still not as dynamic as I would like it to be....

    I am considering buying another 8 speakers...but I want to know...if I place 2 drivers in each cabinet would that effectively drop my box volume down to 2 cubic feet even though the share the common 4 cubic ft chamber?

    I dont want to start cutting holes in these boxes for no reason that is for sure...

    thanks
  2. Francious70 Senior Audioholic

    Francious70
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    You're not happy with 8?!?!?!?!?! Are you deaf??
  3. jaxvon Audioholic Ninja

    jaxvon
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    Which subwoofer drivers did you buy? Are you SURE it isn't a placement issue?

    Edit: Have you thought about reducing the number of woofers you have going? You have so many running, it might a cancellation problem.
    Last edited: Oct 27, 2005
  4. nibhaz Audioholic Chief

    nibhaz
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    I never knew there where THX certified kit speakers??????????
  5. christommes Audiophyte

    christommes
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    okay so everyone has danced around the answer....for one...it is a prototype, and when i say THX i dont mean certified i just mean, people shouldnt have to shell out a million dollars to have a decent system, so i am working on developing a super system with 8-16 subs alone for under $700 this is my goal and so far besides the forum answering the question i have been right on track...

    sound is trust me, mind numbing.....but the issue is perhaps an amplifier one...i purchased two power amps so i am waiting on them to arrive...i really just wanted to know also for future projects the impact of placing multiple drivers in one cabinet...

    thanks
  6. soniceuphoria Audioholic

    soniceuphoria
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    When building mutiple driver enclosures you want to seperate each driver into its own chamber with baffles. There are a couple of reasons for this, such as driver crosstalk. Which is the movements of one driver canceling out the other. The other is the fact that the speakers were designed to operate in a box of a certian cubic feet and increasing or decreasing the size can have a dirrect effect on the frequency response and actual output. There are cases where two drivers occupying the same air space can be a good thing, such as a bandpass box. But in the case of a sealed box your best bet will be to build a box with each woofer seperated by baffles in its own chamber, built to or near the manufactures specifications for the best results. Also make sure that all the speakers are opperating at the same phase (positive and negative going to the correct terminals). And as you have apparently found out, driving 8 subs takes a buttload of power. Powerful PA amps are your best bet to power that many subs cheaply. I hope that this helps you out. Enjoy your wall of subs. :D
    Greg
  7. genesound Enthusiast

    genesound
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    Yes it would.
  8. MACCA350 Audioholic Chief

    MACCA350
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    I have design drawings for the 'House Wrecker' by Decware, see here. It can load up to 4 18" subs. Here is what they say about it:
    A well designed enclosure can mean the difference between an ok sub and a great sub in ported designs. Apparently they levitated a rug off the floor with this thing loaded with just 1 sub:eek: One day I'll get around to building it up and see what it can do:D

    cheers:)
  9. MBauer Audioholic

    MBauer
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    Some suggestions

    I wouldn't say anyone has danced around the answers? To best answer the questions you posed, people needed some clarification (or wanted to comment on your posting).

    So I will answer yor question (a repeat of course) and the answer is yes, another driver will alter the capacity of your enclosure. It will just displace more air, thereby giving you less internal volume available.

    Several things I didn't read. Did you measure the output? There are several DVD's and CD's availalbe that will output test tones so you can measure the output of your speakers. Combining those with an SPL meter from Radio Shack will give you a very good idea of the systems frequencey response. It could well be that they are working fine and the bass you seek is not present in the recording.

    Have you tried changing the location of the sub's? That has a great impact on how they will sound and the levels they will achieve.

    What did you construct the enclosures from? Internal baffling? These are all valid pieces of information to give you assistance.
  10. zilla Junior Audioholic

    zilla
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    My god man, we need pics!!!!:D

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