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Thread: Barrel Sound Signature

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    Barrel Sound Signature

    Here is a list of many barrels, from quietest to loudest 12' from the left side of the barrel


    First number is 12' to the left reading second number is 12' infront of the barrel
    70.93 -----72.91 PPS
    71.59 -----73.44 SLY
    71.62 -----75.3 Kaner
    72.42 -----74.92 SP Teardrop
    72.78 -----82.73 SM-1
    72.81 -----76.18 Matchstik
    73.12 -----74.86 Trilogy
    73.19 -----84.60 Custom Products
    73.45 -----79.83 Empire 7pc
    73.84 -----75.78 Freak 16"
    73.88 -----86.58 Empire Revolver
    74.05 -----76.63 Un1Tec
    74.33 -----80.73 Scepter
    74.31 -----76.10 Freak 14"
    74.53 -----81.81 Redz pepperstick
    74.84 -----76.36 Phat
    74.92 -----89.36 TI Longbow
    74.96 -----81.97 Dye Ul
    76.06 -----76.71 Hammerhead
    77.53 -----75.06 Freak 10"
    80.47 -----89.17 Pipe
    And just proof that unported barrels ARE louder..
    84.38 -----91.68 99 Autococker stock (unported barrel)


    Here is a list of the barrels from quietest to loudest at 12' infront of the barrel.

    70.93 -----72.91 PPS
    71.59 -----73.44 SLY
    72.84 -----73.75 Proto Stock
    73.12 -----74.86 Trilogy
    72.42 -----74.92 SP Teardrop
    77.53 -----75.06 Freak 10"
    71.62 -----75.30 Kaner
    73.13 -----75.42 Xmag stock
    73.84 -----75.78 Freak 16"
    74.31 -----76.10 Freak 14"
    74.84 -----76.36 Phat
    74.05 -----76.63 Un1Tec
    76.06 -----76.71 Hammerhead
    73.45 -----79.83 Empire 7pc
    74.33 -----80.73 Scepter
    74.53 -----81.81 Redz pepperstick
    74.96 -----81.97 Dye Ul
    72.78 -----82.73 SM-1
    73.19 -----84.60 Custom Products
    73.88 -----86.58 Empire Revolver
    74.69 -----87.64 JJ Edge
    80.47 -----89.17 Pipe
    84.38 -----91.68 99 Autococker stock (unported barrel)

    --------------------------

    Lets come up with theories on why some are quieter than others.

    Here is what I came up with,

    MATERIALS

    If Im correct, I did fail chemistry..

    Palmers Barrel is made out of brass, known to be denser than aluminum, However next in line is the sly, and its carbon fiber known to be less dense than aluminum..

    Porting & Length

    Usually longer barrels are quieter, my belief is that a longer barrel allows the air that is propelling the ball more volume and we all know that when you take a pressure and give it more volume the pressure drops. Sound = pressure, thats why a silencer works, it drops the pressure thats exiting the firearm from around 1200 or so psi? to 60 psi..

    Now how many ports?
    How big should the ports be?
    Where should the ports begin?

    What do you guys think?

    Using whatever knowledge you guys have... I know Tom wrote a big article about pressures in the barrel that should really help. Any imput you guys can have would help..
    Last edited by Spencer; 04-16-2008 at 06:10 PM.

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