5.Check to be sure all connections are made and the impedance is within range. Once everything is setup correctly, supply the amplifiers with the 12 volts of power from the batteries.

STRAPPING TWO TA81001 AMPLIFIERS PER VOICE COIL

It is also possible to connect four TA81001 amplifiers by strapping two TA81001s per voice coil. To do this, follow the steps when strapping two TA92001. Those procedures are outlined earlier in this manual. The only exception is that you will now be using two amplifiers for each voice coil. See Figure 3.

Gain setting is done the same as the two TA92001 setup.

Note: Using two TA81001 amps strapped per voice coil produces a total of over 4,000 watts of RMS power with a current draw of around 400 amps.

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.Disconnect the speaker wires from each of the amplifier’s output terminals. It is important to measure the amplifier’s output with no load (i.e. no speakers connected to the output terminals of the amplifier).

2.Set the volume of the headunit to max output (before clipping occurs), play a flat tone (60-80Hz) through the source unit, and hit repeat. Use this same frequency and volume throughout this process.

3.Set the gains on each amplifier to the most sensitive setting within their proper range. Make sure the input sensitivity is set to the x1 setting for a low level RCA input. (See the amplifier’s quick install sheet for gain adjustments).

4.Set the multi meter to AC voltage and connect it to the Positive amplifier’s positive and negative output terminals to measure that amplifier’s output voltage. Switch the multi meter between the amps and measure each of them to determine which one has the lowest output.

Note: Even the difference of 1 volt can significantly alter the performance of your system.

5.Match the other amplifier’s gain to the one with the lowest output. Use the flat tones to gauge what are necessary adjustments.

6.Now that you have matched your amps you will need to set the crossover. It is recommended to have a crossover setting of 60-80Hz and the subsonic filter turned off.

7.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.

MTX.COM

Figure 3

Amplifier driving JackHammer’s negative terminal of 1st Voice Coil

Amplifier driving JackHammer’s positive terminal of 1st Voice Coil

8 AWG

8 AWG

Amplifier driving JackHammer’s positive terminal of 2nd Voice Coil

Minimum 8awg

Speaker wire

Amplifier drivingg JackHammer’sJackHammer’s negativenegative terminal of 2nd VoiceVoice CoilCoil

8 AWG

Minimum 8awg

Speaker wire

8 AWG

Woofer Terminal Connection (Two 4 ohm connections)

4 AWG

1/0 AWG

16AWG

1/0 AWG 4 AWG

Amplifiers main

power terminals

Page 5 Page 7
Page 6
Image 6
MTX Audio JackHammer owner manual Settings and Tuning, Strapping TWO TA81001 Amplifiers PER Voice Coil
Page 5 Page 7

JackHammer specifications

The MTX Audio JackHammer is a powerhouse in the world of subwoofers, known for its sheer size, impressive performance, and engineering excellence. Developed for those who demand deep, thunderous bass, the JackHammer has carved a niche for itself among audiophiles and car audio enthusiasts alike.

One of the most striking features of the JackHammer is its massive 18-inch diameter. This size isn’t merely for show; it enables the subwoofer to move a significant amount of air, which is crucial for producing the deep bass that many listeners crave. The JackHammer is designed to handle high power levels, boasting an impressive RMS power handling capability, which ensures that it can deliver the loud bass without distortion even at high volumes.

Another standout characteristic of the JackHammer is its innovative design. The subwoofer features a high-temperature voice coil, which allows it to handle substantial power without overheating, thereby increasing the system's durability and reliability. The subwoofer also utilizes a dual voice coil configuration, allowing for flexibility in wiring and impedance that can be adapted to suit various system setups.

MTX Audio has equipped the JackHammer with advanced materials to enhance its performance. The cone is constructed from durable materials that resist flexing and distortion, ensuring that the sound produced is clean and precise. The heavy-duty rubber surround plays a vital role in maintaining the integrity of bass production, allowing for greater excursion and improved sound quality.

Additionally, the JackHammer is engineered for optimal efficiency with its specially designed magnet structure. The powerful magnet increases sensitivity and overall output, enabling it to produce maximum sound even with lower power input. This feature is particularly useful for those looking to integrate the subwoofer into different audio setups without compromising on sound quality.

For those who are serious about their car audio experience, the MTX Audio JackHammer stands out as an emblem of raw power and performance. Whether for competition use or personal enjoyment, this subwoofer combines size, innovative technology, and robust construction to create a bass experience that is truly dynamic and engaging. The JackHammer exemplifies MTX’s commitment to delivering high-performance products that cater to the needs of bass enthusiasts around the world. With its unmatched features and capabilities, the JackHammer proudly continues to set benchmarks in the world of subwoofers.
Top Page Image Contents