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Owner’s Manual
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INTRODUCTION
Thank you for choosing MTX to help you reach your ultimate goal with your vehicle. The MTX JackHammer is
a true 22" subwoofer with power and performance beyond anything ever attempted in the mobile audio world.
This behemoth, is capable of handling up to 4,000 watts of RMS power. Designed for those who want to show
off the biggest woofer ever made.
This subwoofer is perfect for excessive bass and competition use. It can also be Re-coned if needed. For
more information, see the Piston Change (Re-cone Kit) section in this manual or call 1-800-CALL-MTX.
The most enormous subwoofer continues to prove that MTX is the biggest, baddest, boldest car audio...ever!
Model T9922-22
Description
Impedance
Frequency Response
SPECIFICATIONS
Power Handling (RMS)
Recommended RMS
Amplifier Power
Voice Coil Diameter
Magnet Weight
Mounting Depth
Cut Out Diameter
Sealed Enclosure Net Volume
Vented Enclosure Net Volume
Port Dimensions (Slot Port)
Speaker Displacement
Port Displacement
Tune Frequency
T9922-22
Fs = 24 Hz
Qms = 5.044
Vas = 5.776 cu.ft
Cms = 0.039 mm/N
Mms = 1140.0 g
Rms = 33.92 kg/S
Xmax = 1 in
Xmech = 3 in
P-Dia = 18.49 in
Sd = 267.84 sq.in
22" JackHammer SuperWoofer
with dual 2 Ohm voice coil
2x2 Ohms
20Hz-150Hz
4000 Watts
2000-4000 Watts
6.5"
900 oz.
21.063"
20.025"
3
6.0 ft
3
8.7 ft
1
24
⁄8"H x 33⁄16"W x 10"L
3
1.8 ft
3
.5 ft
32Hz
P-Vd = 0.155 cu.ft
Qes = 0.441
Re = 0.87 ohms
BL = 18.41 Tm
Qts = 0.406
no = 0.487 %
2.83V SPL = 98.8 dB
BEFORE STARTING
It is very important that you have your JackHammer installed by an authorized MTX retailer, that is preferably
MECP certified. Before installation, make sure you have read the instructions carefully and have the following
equipment:
• Fork Lift (or another means of lifting approximately 370 lbs.)
• Electric drill • 5⁄32" drill bit • 5⁄32", 4mm, 3⁄16" hex keys
• Safety glasses • T-30 Torx • 3mm hex wrench (if re-coning)
• Six 5⁄8"-11 bolts 1 3⁄4" long • 15⁄16" wrench or socket
ElECTRICAl UPGRADE
A factory electrical system will not be able to handle the power requirements of the amplifiers that are
needed to drive the JackHammer. You will need to upgrade your vehicle’s electrical system with both
additional batteries and alternators. MTX Audio recommends West Co. SVR80 or SVR100 because they are
a sealed battery that can be mounted in any configuration and supply the power needed. Also high-output
alternators from either Ohio Generator or PowerMaster. It is recommended to use anywhere from 3 to 6
StreetWires capacitors to help control the flow of power, call 877.STREET1 for more information. The diagram
below shows the wiring needs of your entire vehicle. Please see the Strapping Thunder Amplifiers section for
further information.
StreetWires
1/0 AWG Wire
Isolator
or Relay
200 Amp
Minimum
StreetWires
StreetWires
Distribution
Blocks
StreetWires
1/0 AWG Wire
4 AWG Wire
1F 1F 1F
StreetWires
4 AWG Wire
StreetWires
Capacitors
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RECOMMENDED ENClOSURE REQUIREMENTS
For Sealed Enclosures
The JackHammer requires a volume of 4.2 cubic ft (net) per woofer. The woofer’s displacement is 1.8 cubic ft.
The total gross volume will be 6 cubic ft.
For Vented Enclosures
The JackHammer requires a volume of 8.7 cubic ft (net) per woofer. The woofer’s displacement is 1.8 cubic ft.
The port’s internal dimensions are 24-1⁄8" x 3-3⁄16" x 10" and it takes approximately
.5 cubic ft. The total gross volume will be 11.0 cubic ft.
Additional ranges of sealed volumes for a sealed box is 5 cubic ft or greater gross volume.
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The nal tuning frequency is 32Hz. Additional vented box suggestions are 7.75 to 9.5 (net) cubic ft. Remember
to account for the driver (1.8 cubic ft) and the port displacement, with port tuning ranges from 32 to 42Hz,
when mounting.
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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.
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.
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
The JackHammer Superwoofer is available in a dual 2 Ohm (T9922-22) voice coil conguration. The voice
coils are labeled VC1 and VC2.
Note: Both voice coils should always be connected.
Independent Voice Coil Connection Configuration
This connection is ideal when using two large mono block amplifiers per voice coil.
Parallel Configuration
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 (amplier). Do the same for the
negative terminals. This connection is ideal when using a large 1 Ohm stable amplifier.
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.
Series Configuration
Wiring the voice coils in a series configuration will have a total final load of 4 Ohms.
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T9922-22 WIRING SETUP
This figure shows the recomended amplifier connection for the T9922-22 using the MTX TE4001D amplifier.
4 AWG
1/0 AWG
CAP+ +BATT REM -GND CAP-
16 AWG
1/0 AWG
4 AWG
Amplifier’s main
power terminals
Amplifier shown operating at 1 Ohm driving both
JackHammer voice coils which are wired in parallel.
8 AWG
Minimum 8awg
Speaker wire
Woofer Terminal Connection
(1 ohm connection)
SETTINGS AND TUNING
Strapped amplifiers require “gain matching.” This is the process of adjusting each amplifier’s gain, frequency,
and EQ to be sure both amplifiers are sending the same AC voltage to the woofer. This will require a volt ohm/
multi meter and test tones.
1. It is recommended to have a crossover setting of 60-80Hz and the subsonic filter turned off.
2. The parametric EQ can be used to adjust ±12dB from 30-80Hz with a variable “Q” of 0.5 to 4. Using the
boost in the 60-80Hz region with a “Q” of 1 or 2 is suggested. The “Q” adjusts the bandwidth of frequencies
that are boosted or cut. For more information, read the owner’s manual for the amplifier.
Wiring Conversion from -44 to -22
The T9922-22 requires only one TE4001D amplifier to operate correctly, while the T9922-44 requirers
two TE4001D ampliers. If you are converting your woofer from a dual 4 Ohm (T9922-44RCK) to a dual 2
Ohm (T9922-22RCK) you will need to wire the coils in a parallel conguration (1 Ohm impedance) before
connecting to one TE4001D amplier. The other option is to connect the woofer in series (4 Ohm impedance)
to two TE4001D strapped amplifiers.
PISTON CHANGE (RE-CONE KIT)
Since the installation of the JackHammer is a large investment in time and resources, the cone can be
removed without removing the entire sub or enclosure. Re-coning the woofer is surprisingly easy. No glue is
needed, just bolts, and if you followed the enclosure design it can be done without taking the woofer out of
the enclosure. Directions for either procedure follow.
To Re-cone the Woofer when Removed from the Enclosure
To remove the cone, unscrew the twelve 3⁄16" hex screws from the front gasket of the woofer and remove the
gasket. Next remove the six 5⁄32" hex screws from the back of the spider plateau and loosen the tinsel leads at
the terminal. The tinsel leads are the four 3mm hex screws at the top of the terminal that hold the voice coil
wires. Gently pull on the cone under the surround and the cone assembly should pull away from the woofer
motor. Be sure and pull evenly to prevent the assembly from binding in the basket. You are now ready to put in
the new re-cone kit.
Place the new cone assembly into the woofer motor. Make sure to align the tinsel leads from the re-cone kit
with the terminals and line up the large notches in the surround with the largest holes in the basket. Insert
the tinsel leads into the terminal ensuring the red lead is going into the positive (+) position and the black lead
is going into the negative (–) position. Tighten the four set screws and then slightly tug in the tinsel leads to
make sure they are tight in the terminal.
Next, insert the six 5⁄32” hex screws back into the spider plateau and tighten. Replace the top gasket over
the surround on the top of the woofer. The counter-bore holes in the gasket need to align with the smaller
threaded holes in the basket. Insert the twelve 3⁄16" hex gasket screws into the counter-bored holes and
tighten. Your new cone is now installed and you are ready to once again experience the JackHammer’s
extreme bass!
To Re-cone the Woofer when Installed in the Enclosure
If you have made the back removable, as suggested earlier in this manual, you can remove the cone without
removing the woofer from the enclosure. To remove the cone, unscrew the twelve 3⁄16" hex screws from the
front gasket of the woofer and then remove the top gasket. DO NOT remove the T-30 wood screws because
the gasket can be removed with these still in place. Next, remove the six 5⁄8" bolts from the back with a 15⁄16"
wrench and pull off the back of the enclosure. Then, remove the six 5⁄32" hex screws from the back of the
spider plateau and loosen the tinsel leads at the terminal. The tinsel leads are the four 3mm hex screws at
the top of the terminal that hold the voice coil wires. Gently pull on the cone under the surround and the cone
assembly should pull away from the woofer motor. Be sure and pull evenly to prevent the assembly from
binding in the basket. You are now ready to put in the new re-cone kit.
Place the new cone assembly into the woofer motor. Make sure to align the tinsel leads from the re-cone kit
with the terminals and line up the large notches in the surround with the largest holes in the basket. Insert
the tinsel leads into the terminal ensuring the red lead is going into the positive (+) position and the black lead
is going into the negative (–) position. Tighten the four set screws and then slightly tug in the tinsel leads to
make sure they are tight in the terminal.
Next, insert the six 5⁄32" hex screws back into the spider plateau and tighten. Replace the top gasket over
the surround on the top of the woofer. The counter-bore holes in the gasket need to align with the smaller
threaded holes in the basket. Insert the twelve 3⁄16" hex gasket screws into the counter-bored holes and
tighten. Finally, replace the back of the enclosure and re-attach the 5⁄8" bolts to support the back of the woofer.
Your new cone is now installed and you are ready to once again experience the JackHammer’s extreme bass!
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USE 3MM HEX KEY TO LOOSEN
SET SCREWS TO INSTALL TINSEL LEADS
USE 4MM HEX KEY TO LOOSEN
SET SCREWS TO INSTALL WIRE
(12 EACH) 1/4-20 X 1-1/4" SOCKET CAP SCREW
STEEL WITH BRIGHT CHROME PLATE HEX SOCKET
SIZE 3/16" REMOVED THESE TO TAKE THE GASKET
OFF FOR RE-CONING
(12 EACH) 1/4-14 X 3" TORX SOCKET HEAD
STEEL WITH BRIGHT CHROME PLATE
T-30 TORX DRIVE USE THESE TO MOUNT THE WOOFER
(IF WOOFER DOESN'T NEED TO BE REMOVED FOR
RE-CONING THEN THESE CAN STAY IN PLACE)
RED INSULATION
VC1 +
BLACK INSULATION
VC1 -
RED INSULATION
VC2 +
BLACK INSULATION
VC2 -
ALIGN LARGER NOTCHED HOLES
WITH THREAD THROUGH HOLES
IN BASKET
NOTES:
ALIGN TINSEL LEADS
(6 EACH) 1/4-20 X 1" SOCKET BUTTON HEAD SCREW
STEEL WITH BRIGHT CHROME PLATE HEX SOCKET
SIZE 5/32" REMOVE THESE FOR RE-CONING
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WITH TERMINAL
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© 2009 Mitek Corporation. All rights reserved. MTX, Thunder, JackHammer and StreetWires are
trademarks of Mitek Corporation. Designed and Engineered in the U.S.A.
Due to continual product development, all specifications are subject to change without notice.
MTX Audio, 1 Mitek Plaza, Winslow, IL 61089 U.S.A.
MTX002140 RevD 1/09 21A9259
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