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  • 2 subs vs 1 sub

    I thought once i read that on average the increase between using 2 subs over 1 is only about 15% in SPL? Is this true? Cost and space wise i was thinking of just using 1 sub, im more of a SQ person, but i still want some SPL. Would an extra jl 12w6 be worth the $600 investment? Or are there minimal gains?

  • #2
    provided with the right amount of power a 12" JL W6 is really potent...however if you want to let the whole neighborhood that you are there then get 2 W6's. Personally I would be content with one. If you want the extra 12 just to be like I have 2 12's, I would rather go with 3 W3's.
    CarPC Status: Planning/Learning Phase

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    • #3
      One 12" with a decent amp will be plenty if you just want good/solid bass for IN the car..... If you want to entertain those outside the car you could go with another one, but I wouldn't for $600.

      Personally used to have three 10"s in an old car, moved to using just two in current car now and have thought about just going to one (or using one 12"). I don't blare it with the windows down and could use the trunk space.
      Nick
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      • #4
        My situation is a little different, I bought one sub - a Pioneer TS-W256C, had an amp already, from my old setup in my old truck. Decided to try to run the sub with the amp I had - a MA audio 400 RMS @ 4 ohm and it was freaky loud but I ended up blowing the amp so I got an Alpine which the salesman told me was 400 W... anyhow it was 400 W @ 2 Ohm but only 220 @ 4 ohm, so I bought another sub to make the 2 ohm load. Both of my subs fit behind the rear seats in my truck so I'm not too concerned about having two of them, but with a higher powered amp the single will kick just as well.

        I think, if I recall correctly, that adding an identical sub and amp to an existing single setup, will give you a 3 dB increase in SPL. For another 3 dB, you need to double up again, for a total of 4.
        .
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        • #5
          Originally posted by furball69
          My situation is a little different, I bought one sub - a Pioneer TS-W256C, had an amp already, from my old setup in my old truck. Decided to try to run the sub with the amp I had - a MA audio 400 RMS @ 4 ohm and it was freaky loud but I ended up blowing the amp so I got an Alpine which the salesman told me was 400 W... anyhow it was 400 W @ 2 Ohm but only 220 @ 4 ohm, so I bought another sub to make the 2 ohm load. Both of my subs fit behind the rear seats in my truck so I'm not too concerned about having two of them, but with a higher powered amp the single will kick just as well.

          I think, if I recall correctly, that adding an identical sub and amp to an existing single setup, will give you a 3 dB increase in SPL. For another 3 dB, you need to double up again, for a total of 4.
          alright... so doubling up will make it just loud enough to tell its there. doesn't seem worth it to me.

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          • #6
            Originally posted by zzachattack2
            I thought once i read that on average the increase between using 2 subs over 1 is only about 15% in SPL? Is this true? Cost and space wise i was thinking of just using 1 sub, im more of a SQ person, but i still want some SPL. Would an extra jl 12w6 be worth the $600 investment? Or are there minimal gains?

            doubling your cone area (leaving all else constant) will net a 3 db gain. That's roughly twice as loud.

            doubling your power (all else constant) will net a 3 db gain as well.

            porting your enclosure to the right specs will also gain 3 db.

            BUT! before I have someone jump down my throat because I didn't go into a thesis of an explaniation....

            there are limitations. These are simply rules of thumb. There is a point of no return.

            Before you go dumping money into another sub, check out your enclosure. Is it prefab? Is it custom built for THAT sub? Do you have enough power going to the sub? Are you fully utilizing everything you have in your car right now?

            I'd check these things before I considered dropping 6bills on another sub, which would then need more power, and an entirely new box built (so you aren't just spending the $600 on the sub).
            Jan Bennett
            FS: VW MKIV Bezel for 8" Lilliput - 95% Finished

            Please post on the forums! Chances are, someone else has or will have the same questions as you!

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            • #7
              Originally posted by Red GTi VR6
              doubling your cone area (leaving all else constant) will net a 3 db gain. That's roughly twice as loud.

              doubling your power (all else constant) will net a 3 db gain as well.

              porting your enclosure to the right specs will also gain 3 db.

              BUT! before I have someone jump down my throat because I didn't go into a thesis of an explaniation....

              there are limitations. These are simply rules of thumb. There is a point of no return.

              Before you go dumping money into another sub, check out your enclosure. Is it prefab? Is it custom built for THAT sub? Do you have enough power going to the sub? Are you fully utilizing everything you have in your car right now?

              I'd check these things before I considered dropping 6bills on another sub, which would then need more power, and an entirely new box built (so you aren't just spending the $600 on the sub).
              Thanks...

              but just so you know 3dB is not twice is loud, its standard for the minimal audible difference, or twice the power, or 1.5 times the physical sound pressure; 8-10dB is usually considered twice as loud...

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              • #8
                everything I've ever been told or read is that 3 db is roughly twice as loud.

                guess I was wrong!
                Jan Bennett
                FS: VW MKIV Bezel for 8" Lilliput - 95% Finished

                Please post on the forums! Chances are, someone else has or will have the same questions as you!

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                • #9
                  I used to think that as well....
                  http://www.musiccenters.com/vol.html

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                  • #10
                    10db is correct (sorry, phsycis flashbacks).

                    Personally, i'd go with BIGGER cone area. I know someone put 21 10"subs and 3 12's sounded so much better and louder. Bigger and well built is better. Hell, i'm using one 10 w/radiator and it should be enough for my bass. Not a big spl guy.
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                    • #11
                      ya know, I sat here and thought about it...and am amazed at how retarted I am...lol

                      I know that doubling your cone area doesn't double 'your volume, that's pretty basic stuff...

                      so how doubling your cone area gives you 3db and it doubles your volume is beyond me....lol

                      Sorry for the missinformation

                      Jan Bennett
                      FS: VW MKIV Bezel for 8" Lilliput - 95% Finished

                      Please post on the forums! Chances are, someone else has or will have the same questions as you!

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                      • #12
                        When I ran one sub at its recommended enclosure specs it felt like I needed to push it hard to get high volume when I wanted it, of course that is at a sacrifice of sound quality. When I got one more of the same sub, I could play the subs at lower power and still get the same amount of bass and it was more pure. When I actually turn it up I can honestly say it is much more powerful, not slightly more powerful, than having one sub. I think its worth the extra investment if you think you don't have enough bass. If you ask me the best part about car audio is never being satisfied with what you have and always wanting change. Maybe thats just me! I have no regrets going with 2 -12s. I don't really care about SPL numbers very much but my ears and the hair on my head tells me that 2-12s moves much more air than 1.

                        Hey Red, you have been helping me on my SQ sub post. I think you are considering going from 1 to 2 and I am debating on going from 2 to 1 :-P

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                        • #13
                          nope - not cosnidering going from 1 to 2.

                          my single 15 does what I need.

                          I'm considering porting the enclosure so I can hit the lower frequencies.
                          Jan Bennett
                          FS: VW MKIV Bezel for 8" Lilliput - 95% Finished

                          Please post on the forums! Chances are, someone else has or will have the same questions as you!

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                          • #14
                            PhatMo; when you added the sub, how did you wire it? If you just paralleled it with the other sub and used the same amp the load the amp sees would be half what it was with the single... some amps put out almost twice as much power at half the load, so, not only did you double your cone surface area, you could have doubled your amps power output, giving you perhaps, close to 6 dB increase in SPlL, effectively a 4-fold increase, not just two.
                            .
                            homebrew sound deadening + sub and amp install... 04 Dakota QC

                            fuel economy calculators

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                            • #15
                              Yea thats a very good point furball. I do realize that as well. I am just saying that adding another sub can made a significant increase over running just one. Right now I have 2 -4ohm dual voice coil Perfect 12D Vqs bridged to a 4ohm load. Im putting down roughly 800 watts RMS right now. Before I was wired at 8ohm with just one. I am sure the power increase does make a big difference.

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