MTX Audio JackHammer Settings And Tuning, STRAPPING TWO TA81001 AMPLIFIERS PER VOICE COIL

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.

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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