MTX Audio JackHammer Mounting, Wiring Options, Dual Voice Coil Wiring, Parallel Configuration

MOUNTING

Mounting the JackHammer is nothing that can be taken lightly, quite literally. You need to follow the steps below carefully and have all the necessary equipment. You will need to be able to lift the nearly 370 lbs. subwoofer comfortably. MTX Audio recommends a fork lift for safe installation.

The woofer is designed to distribute its weight evenly throughout the entire structure. This is accomplished by including rear motor mounts with 5⁄8"-11 bolts so it is mounted from both the front and the back. It is important that both these sides are mounted properly to ensure proper weight distribution. The drawing above shows the rear mounting hole detail for the back support. The holes are located on an 8 5⁄8" bolt circle, meaning the holes are located on a radius of 4 5⁄16" from the center point. Use the pallet from the Jackhammer packaging to make a mounting template if needed. For the recommended 1" baffle, the bolts needed should be 5⁄8"-11 threaded bolts 1 3⁄4" long. Washers should be used with the 5⁄8"-11 bolts to be sure there will be no air leaks around the bolts.

Note: MTX Audio also recommends making the back of the enclosure removable to replace the woofer cone if ever needed. This would make it possible to replace the cone assembly without removing the woofer.

In the gasket of the woofer, there are four eyelet rings. Make sure they are screwed in securely and then attach a chain between them for lifting. Use one tine of the fork lift to lift the JackHammer with the chain then slowly lower it into the enclosure. Unscrew the eyelets and align the woofer with the front and rear mounting holes, and then fasten it using the screws and bolts provided. Remember to pre-drill the screw holes using a

5⁄32" drill bit. Then, lift the enclosure, complete with JackHammer, into the back of the vehicle.

For models shipped already in the enclosure, installation becomes a step easier; you need to just lift the enclosure with JackHammer into the back of the vehicle. Continue on to the wiring section.

Note: This unit is EXTREMELY heavy! Make sure everyone is clear and out of the way in case something should break or fall!

Note: MTX Audio is not responsible for damages occurred during installation. For custom installation help or answers to further questions, please call 1-800-CALL-MTX.

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WIRING OPTIONS

Often overlooked, the installation components used to connect the entire system need to match the maximum capability of the system or you will lose performance. MTX Audio recommends using StreetWires 4 AWG cable as the speaker wire.

Dual Voice Coil Wiring

JackHammer Superwoofers are available in a dual 2 Ohm (T9922-22) or dual 4 Ohm (T9922-44) voice coil configuration for either SPL or SQL uses. The voice coils are labeled VC1 and VC2.

Note: Both voice coils should always be connected. See the section on Strapping Thunder Amplifiers for amplifier connections.

Independent Voice Coil Connection Configuration

This connection is ideal when using two Thunder TA81001 amplifiers per voice coil (4 amplifiers total). See the section on Strapping Thunder Amplifiers for amplifier connections.

Parallel Configuration

T9922-44 – Wiring the voice coils in a parallel configuration will have a total final load of 2 Ohm. Connect each of the dual voice coil’s positive terminals together so that they share the same source (amplifier). Do the same for the negative terminals. This connection is ideal when using two Thunder TA92001 amplifiers.

T9922-22 – Wiring the voice coils in a parallel configuration will have a total final load of 1 Ohm. Connect each of the dual voice coil’s positive terminals together so that they share the same source (amplifier). Do the same for the negative terminals.

Note: The wiring of the dual voice coils will affect impedance for the amplifier system. Care must be taken to assure that the resulting impedance does not exceed the amplifier’s requirements.