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Congratulations on your purchase of the new CRUNCH Ground
Pounder GRP Series subwoofer system. The GRP subwoofer series
offer incredible output, great sound quality and outstanding
good looks.

As with all high quality car audio products, we recommend 
professional installation by an authorised Crunch 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.

12-Inch DVC / SVC Subwoofer
Dual 4-Ohm / Single 4-Ohm Voice Coil
High Energy Magnet
Ultra Rigid Pressed Paper PPC Cone
Foam Gasket
Multi-Layer High-Temp VC
Polypropylene Dust Cap
Front-Plate & Voice-Coil Cooling
Poly Cotton Spider
Hi-Excursion Foam Surround
Anti-Resonant Magnet Boot

GROUND POUNDER 
       GRP SERIES

CAR AUDIO SUBWOOFERS

CRUNCH

Summary of Contents for GRP12D4

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Page 2: ...s 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 12 Inch DVC SVC Subwoofer Dual 4 Ohm Single 4 Ohm Voice Coil High Energy Magnet Ultra Rigid Pressed Paper PPC Cone Foam Gasket Multi Layer High Temp VC Polypropylene Dust Cap Front Plate Voice Coil Cooling Poly C...

Page 3: ... 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 glu...

Page 4: ...ers Qtc 1 14 1 27 F3 38 38 Hz Box Volume 2 1 59 47 2 1 59 47 Cubic Feet Liters Fb 37 37 Hz Port Size Diam 4 101 6 4 101 6 Inches Millimeters Port Length 10 254 10 254 Inches Millimeters F3 33 34 Hz GROUND POUNDER GRP SERIES SUBWOOFERS CLOSED BOX DESIGNS SEALED VENTED BOX DESIGNS ROUND PORT NOTE All above box volumes are internal values and already include subwoofer and port displacement The F3 val...

Page 5: ...oud speaker Qes Electrical Q of a system Re DC resistance Le VC inductance Pe Maximum input power Qts Total Q of the system Sens Sensitivity An efficiency measurement in dB s Vc Volume of a closed or sealed enclosure Vb Volume of a vented enclosure Fc The resonant frequency of a closed or sealed system Fb The resonant frequency of a vented system F3 The half power 3dB frequency of a loud speaker e...

Page 6: ...5 GRP12S4 SVC 4 Ohms 4 Ohms PARALLEL 2 Ohms SERIES 8 Ohms ...

Page 7: ...6 GRP12D4 DVC 4 Ohms PARALLEL COILS PARALLEL SUBS 1 Ohm SERIES COILS PARALLEL SUBS 4 Ohms SERIES PARALLEL 8 Ohms 2 Ohms ...

Page 8: ...NSIONS 5 7 144mm Mounting Depth When designing an enclosure for this subwoofer please ensure to leave atleast 2 of clearance from the back of the motor to the back of the enclousre 12 2 310mm Outside Diameter 11 279mm ...

Page 9: ...Valid purchase receipts will contain the name and address of the authorized reseller Any damage to the product as a result of misuse abuse accident incorrect wiring improper installation alteration of date code or bar code labels revolution natural disaster or any sneaky stuff because someone messed up repair or alteration out side of our factory or authorized service centers and any thing else yo...

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