Autotek M12D4 Instruction Manual

MEAN MACHINE SERIES

CAR AUDIO SUBWOOFERS

Congratulations on your purchase of the new Autotek Mean Machine
Series subwoofer system. The Mean Machine subwoofer series has
received a progressive new look with the addition of an illuminating
logo on the cone. The Mean Machine subwoofer series has made
its’ name in the industry as one of the most efficient and loudest
subwoofers in its’ price range. The Mean Machine subwoofers feature
incredible cosmetic detail, accurate bass reproduction through a
wide range of frequencies, and impressive power handling
capabilities.

Available In DVC 4-Ohm High-Temp Voice Coils
12” Round Subwoofer
Rubber Surround
Flat Nomex Spider With Woven Tinsel Leads
One Piece Polypropylene Cone/Dustcap With Illumination
Spade Style Speaker Terminals
High Energy Magnet Assembly
Heat Dispersing Ported Back Plate
Ultra Ridged Stamped Steel Basket
High Strength ABS Motor Cover
Operates In Sealed & Ported Enclosures
Black Chrome-Plated Gasket

As with all high quality car audio products, we recommend
professional installation by an authorized Autotek dealer. Your
dealers knowledge and experience can ensure a problem free and
cosmetically integrated installation. If you choose to install the
subwoofers yourself, please read the entire manual very carefully.

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SUBWOOFER INSTALLATION AND WIRING DIRECTIONS

Enclosure Materials

Typically, 5/8” or 3/4” MDF (Medium Density Fiber Board) is best
for most applications. 3/4” MDF is recommended.

Enclosure Build Materials
Connecting joints need to be glued and screwed to ensure no
air escapes and joints do not separate under high pressure.
Mitered and rabbet joints also help to ensure the enclosure joints
are secure.

Bracing

Internal bracing is also recommended to prevent flexing and to
strengthen the enclosure.
Note: The volume taken up by the bracing should be added to the
total enclosure interior volume.
There are two common bracing methods.

1. Corner Bracing: These help prevent the connection joints
from separating under heavy vibration and air pressure.
Use 1’ x 1” MDF at all interior joints

2. Diagonal Bracing: These internal braces connect the top side
to the bottom side as well front side to back side. This prevents
the wood from bowing or pushing outwards.
Use 1” x 2” with 1” surface contact that is glued and screwed.

Wiring

Wiring Parallel, Series or Parallel/Series will affect the final
impedance at the amp and great care must taken to ensure the
amp is not driven below it’s intended impedance capabilities.

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