MTX Audio TA7804 User Manual

Page 3

Disconnect the vehicle’s negative battery connection. Any deviation from the recommended connection

procedures may cause serious damage to the ampliﬁ er, speakers, and/or vehicle electrical system. Please

double check the connections before turning the system on.

Installation

Mounting

Place your Thunder ampliﬁ er at the predetermined mounting location. Use a felt pen to mark the exact position

of the mounting holes on the mounting surface. Set the ampliﬁ er aside. Then with a sharp, precise blade cut

small circles in the carpet and padding around the four marks denoting your mounting holes to expose the

metal underneath. Use a center punch to make an indentation in the metal to ensure that you drill the exact

position for the screws.

Note: Please use common sense and make sure that all vehicle wires, gas lines, brake lines, etc. are clear and will

not interfere with the installation. ALWAYS WEAR PROPER SAFETY GLASSES.

Connections

1. Bi-Level Inputs (Low/High Level Input) with Smart Engage™ – Both a low and high level signal can be used.

Be sure to lay the signal wire away from all power cables and vehicle computers. Use high quality twisted pair

interconnect cables to decrease the possibility of radiated noise entering the system.

• Using RCA Connections: If the source unit has RCA outputs, simply attach a signal cable from the source unit

to the amp’s RCA input. This will provide signal to the amp.

• Using Speaker Level Connections: If the source unit does not have RCA outputs, a high level signal can be

used instead by taking the supplied high level RCA adapter cables and connecting the bare wire ends to the

vehicle’s rear speaker wiring. Connect the left negative speaker wire to the green with black stripe wire on the

supplied high level RCA adapter. Connect the left positive speaker wire to the solid green wire. Do the same

for the right speaker connection using the purple wire. Now plug the RCA connectors located on opposite

end of the supplied high-level RCA cables into the amp’s inputs. When connecting the front channel, use the

included grey and white high level RCA adapter cables. The grey wire is used for the front left and the white

wire is used for the front right.

2. Speaker Wire Connections –

When installing the speaker wires, please take proper measures to protect them. For example, when

connecting the door speakers, the speaker wire should run from the ampliﬁ er’s output terminals, under the

carpet, and through the factory rubber boot (loom) that protects the wires in the inner door jam. If the factory

boot cannot be used, take other measures to protect these wires. Sometimes the door has to be completely

removed to use the factory boot. If this is something that you do not feel comfortable doing, please ask a

professional to help you.

When connecting the speaker wires to the ampliﬁ er please observe the printed polarity markings on the

ampliﬁ er’s StreetWires connector. Failing to wire the speakers in proper phase could result in a loss of bass

response or poor overall sound quality.

These amps will have eight speaker terminals: front left positive, front left negative, front right positive, front right

negative, rear left positive, rear left negative, rear right positive, and rear right negative.

• Stereo (4-channel) Connection: This conﬁ guration is typically used with full range or high frequency

speakers. Each channel can drive a minimum of a 2 ohm load.

• Front Stereo/Rear Bridged (3-channel) Connection: This conﬁ guration is typically used with full range

speakers connected to the front outputs and subwoofer(s) connected to the rear outputs. Each front channel

can drive a minimum of a 2 ohm load. The rear bridged conﬁ guration can drive a minimum of a 4 ohm load.

• Bridged (2-channel) Connection: This conﬁ guration is typically used with subwoofers. Both the front and rear

outputs can be bridged individually and each can drive a minimum of a 4 ohm load.

• Dual Mono (1-channel) Connection: This conﬁ guration is typically used with subwoofers. All channels can be

combined for max power (both the front and rear outputs can be bridged together) and can drive a minimum

of a 2 ohm load.

Note: Please pay attention and make sure the speakers or woofers are the correct IMPEDANCE (OHMS) BEFORE

attaching to the ampliﬁ er.

3. Power Terminals – Please take proper measures during installation to protect the power wires as best you

can. For example, when running the power cable from the vehicle’s battery through the ﬁ rewall, use a ﬁ rewall

bushing for protection. Run the power wire through the interior of the vehicle, under the carpet, and to the

ampliﬁ er. If this is something that you do not feel comfortable doing, please ask a professional to help you.

Be sure to lay the power wire away from all signal cables. When connecting the power wires to the ampliﬁ er

please observe the printed markings on the ampliﬁ er’s StreetWires power connector. Failing to wire the power

cables properly could result in ampliﬁ er damage.