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Reload Thread: size of vehicle and spl

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    littlebuddy34's Avatar
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    size of vehicle and spl

    How much does the size of your vehicle affect how loud your subs are. Does it have a very significant effect on spl. I ask this because i have a mag d2 in 2.5^3@29hz with 1200 watts. I drive a suburban. My friend has a jl audio w6v2 in the recomended box, probably 2cu ft., and 600watts. He drives an explorer. And i would have to say that you can barely tell the difference in which one is louder. I think that mine should be louder and that the size of my vehicle is the reason why it isn't.



    99 GMC Suburban

    Current System

    Sub Amp- a2150hct audiobahn(yeah i know)
    1200 watts@1ohm

    Sub- 12" SI Magnum D2

    HU- Pioneer AVH-6600, dvd in-dash 6.5" screen

    Speakers- 6.5" Rf 3-way coaxials, off HU power (Aura mr62's awaiting install possibly in new car)

    Box- 2.5cuft @ 29hz.




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    Moe Lester's Avatar
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    Re: size of vehicle and spl

    Explorers get loud




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    littlebuddy34's Avatar
    littlebuddy34 is offline Senior VIP Member

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    Re: size of vehicle and spl

    Yeah i know, but u really didn't answer my original question.



    99 GMC Suburban

    Current System

    Sub Amp- a2150hct audiobahn(yeah i know)
    1200 watts@1ohm

    Sub- 12" SI Magnum D2

    HU- Pioneer AVH-6600, dvd in-dash 6.5" screen

    Speakers- 6.5" Rf 3-way coaxials, off HU power (Aura mr62's awaiting install possibly in new car)

    Box- 2.5cuft @ 29hz.

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    dan7532's Avatar
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    Re: size of vehicle and spl

    My newbie guess is that in larger vehicles, the bass has to travel farther and thus looses its loudness as it travels farther.

    Now about box positioning: you do have your subs facing your taillights, correct? And you might want to try moving the box more towards the tailgate of your SUV. If the box is closer to the tailgate, the bass should be louder. Don't take my word for it, just a noob here. But I would try moving your box around to see what works best.




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    Re: size of vehicle and spl

    yeah i would also guess that since your closer to the bass that it would be louder in a smaller vehicle but i'm just looking for somebody to tell me how much of an effect this can have. I want to know if it is the reason why my system isn't as loud as i expect it to be.



    99 GMC Suburban

    Current System

    Sub Amp- a2150hct audiobahn(yeah i know)
    1200 watts@1ohm

    Sub- 12" SI Magnum D2

    HU- Pioneer AVH-6600, dvd in-dash 6.5" screen

    Speakers- 6.5" Rf 3-way coaxials, off HU power (Aura mr62's awaiting install possibly in new car)

    Box- 2.5cuft @ 29hz.

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    bibby's Avatar
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    Re: size of vehicle and spl

    My s10 is waaaay loud w/ two 12's, 800watts.



    If you are viewing my profile from SMD, FSC, or d-series.org, then this is the thread with my refs...
    Refs: http://www.caraudio.com/forum/showthread.php?t=231239

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    Re: size of vehicle and spl

    What is SPL? It stands for Sound Pressure Level. In effect, its a measurement of the amount your speakers compress the air inside your vehicle (thus the word pressure). Imagine your speaker cone moving back and forth, as it does so it compresses and decompresses the air in your vehicle (depending if its moving in or out). Put that 'air pump' in a car, the cone moves in and out its 1inch lets say. Now put that speaker in a gymnasium, while its still moving that 1inch. The gymnasium has much more air to compress, so as that cone moves out the one inch, each air molecule is compressed less in the gym than in the much smaller car. Less air to compress = more SPL given the same output.

    There are other factors to take into account, resonant freqs, wavelengths at that/those freqs, etc. But generally speaking a smaller vehicle has the capabilities to get louder. FYI, that's the idea of a wall, enclose the cabin volume down to as small as possible.




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    Re: size of vehicle and spl

    thanks, finally a reply based on factual information. Very helpful.



    99 GMC Suburban

    Current System

    Sub Amp- a2150hct audiobahn(yeah i know)
    1200 watts@1ohm

    Sub- 12" SI Magnum D2

    HU- Pioneer AVH-6600, dvd in-dash 6.5" screen

    Speakers- 6.5" Rf 3-way coaxials, off HU power (Aura mr62's awaiting install possibly in new car)

    Box- 2.5cuft @ 29hz.

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    Re: size of vehicle and spl

    my brahma 15 in a 4 cube box tuned to 30 in my S10 goes boooooooooooom be4 that i had it in a 1.25cube sealed box and when i put that from my jeep into the s10 it got like twice as loud




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    Re: size of vehicle and spl

    you all are wrong, in a suv it will seem alot louder cause the sounds waves slow down, and in a smaller car, the sound travel's quicker and smaller cars act like another box




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    Re: size of vehicle and spl

    Quote Originally Posted by dbhittin
    you all are wrong, in a suv it will seem alot louder cause the sounds waves slow down, and in a smaller car, the sound travel's quicker and smaller cars act like another box
    How do you theorize that the size of the car affects the speed of sound? The only thing that affects the speed of sound waves is the density of the medium its traveling through. Check your physics book.




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    Re: size of vehicle and spl

    10's in my hatchback seem louder to the ear than 15's would, trust me ive done lots of testing with all sizes in my cars. Every car is differen't,but i still think suvs sound the loudest




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    Re: size of vehicle and spl

    A main factor that you guys seem to be leaving out is the design of the car. Hatchbacks are prime for SPL due to the gain they get due ot the desing of hte cabin. CRX's are sweet for SPL for that exact reason. In the explorer vs suburban example audioholics air compression comes into play. So to answer your quesiton, yes the vehicle makes a huge difference, along with deadening, box, box placement, power, and driver.



    Alpine CDA-7995, A/D/S 3 Series Comps, ED 8A, SoundStream Reference 604, 98 Civic Sedan
    AIM: nosaj070

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    Re: size of vehicle and spl

    take a CRX and throw 2 15's same box and power and throw 2 15's in a say Tahoe same box and power, which would seem louder? crx will probly get a better score on the meter,but i bet u will hear and feel the suv better




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    Re: size of vehicle and spl

    i too feel like suv's you feel it more. but geez in my m@x it will take something crazy to get it loud. all my friends with suv's own me in spl and sometimes with less power it's sad



    DTM HATER

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