THUNDER TA91002 Owner's Manual

• Setting the Boost/Cut: Once you determined the loudest musical spot or range within the bass range of your

sound system, start cutting until the response is smooth and even. You can also boost low spots within the

musical range, but don’t go crazy with the boost knob. There is a lot of boost available, 12dB, but begin with

a low boost setting (around 3dB) and try to stay below 6dB whenever possible. Remember that for every 3dB

of additional boost you dial in, you are asking the ampliﬁ er to double its power output for a given signal in the

boost region.

6. Adjusting the Active Resonance Control (A.R.C.) Feature – This feature will be needed when mounting

speakers lower in the door or in kick panels. Most vehicles have a natural peak that occurs at about 200Hz. By

turning the Pot located on the top control panel clockwise you to CUT 200Hz up to 15dB. This allows you to

remove unwanted peaks in your mids and highs that occur in most vehicles.

7. Remote Subwoofer Level Control (Remote Gain) – Let’s say the ampliﬁ er’s gain is set at halfway. When the

remote subwoofer level control is plugged in, you have external control of the gain from zero to halfway. The

installation of this level control is NOT necessary to get full power from ampliﬁ er.

Note: One Remote Subwoofer Level Control can control two or more ampliﬁ ers using a mini plug Y-adapter.

8. Processor Bypass – The “PROCESSOR BYPASS” switch has two modes of operation, on or off. If the switch is

set to “ON” position, all crossover ﬁ lters and EQ controls are bypassed, leaving only the operation of the gain

control adjustments. If the switch is set to “OFF” position, all crossover ﬁ lters and EQ controls are enabled.

9. Prizm EFX – Now that you have completed adjusting all your ampliﬁ er settings, you can set the lighting effects

to your personal taste.

• Selecting Colors: You can change the backlit colors simply by turning the dial labeled PRIZM COLOR located

in the MTX PRIZM EFX section of the control panel left or right. Starting at the left most position, the colors

range from RED to GREEN, BLUE, and then RED again. You can choose any color in between making the

combinations unlimited.

• Selecting the EFX Feature: You can switch Prizm EFX lighting to “pulsate” with the beat of the music. Simply

depress the button labeled PRIZM EFX located in the in the MTX PRIZM EFX section of the control panel to

turn this feature on or off.

Trouble Shooting

Read this if you want to be a do-it-yourselfer or give us a call at 800-CALLMTX.

PROBLEM CAUSE SOLUTION

No LED indication No +12V at remote connection Supply +12V to terminal

No +12V at Power connection Supply +12V to terminal

Insufﬁ cient ground connection Verify ground connection

Blown power fuse Replace fuse

LED on, no output Volume on head unit off Increase volume on head unit

Speaker connections not made Make speaker connections

Gain control on ampliﬁ er off Turn up gain

Signal processing units off Apply power to signal processor

All speakers blown Replace speakers

Output distorted Head unit volume set too high Lower head unit volume

Ampliﬁ er gain set too high Lower ampliﬁ er gain

Balance reversed Speakers wired L + R reversed Wire speakers with correct orientation

RCA inputs reversed Reverse RCA input

Bass is weak Speakers wired out Wire with correct of phase

phase

Not using MTX woofers Buy MTX woofers

Blowing fuses Excessive output levels Lower volume

Ampliﬁ er defective Return for service