GPX1200.4 - Receiver Crunch - Free user manual and instructions

USER MANUAL GPX1200.4 Crunch

- This device is only suited for a 12 volt system with negative ground. - The radiated heat while operation requires sufcient air circulation at the place of installation. It is very important that the heat sink ns do not have contact with any metal parts or any surfaces which could impair air circulation. The amplier may not be installed in small closed location or spaces without air circulation (e.g. spare wheel recess or below the vehicle carpeting). We recommend the installation in the vehicle’s trunk. Ensure sufcient protection against vibrations, dust and dirt. - Ensure that the input and output cables are sufciently separated from the power supply cables. Otherwise interferences may occur. - Ensure the accessibility of the fuse and the operating elements after installation. - The reliability and performance of the amplier depends on the quality of installation. Preferably consult an expert to install the system, particularly if you want to install several loudspeakers.

POWER SUPPLY AND TURN-ON-CONNECTION

INTERCONNECTION ATTENTION: Before you start with the installation, disconnect the ground connection from the ve- hicle’s battery in order to prevent short circuits. The power wiring which is usually installed in on-board car networks is not sufcient for a power amplier‘s demands. Make sure that the power wires to GND and to the +12 V terminal has been sufciently specied. A cable cross-section of at least 10 mm

must be used to connect the battery to the amplier‘s terminals. First connect the GND terminal of the amplier to an appropriate ground connection at the chassis. To ensure a good connection, residue dirt and dust from the connection point. A loose connection may cause malfunctions or interferences noise and distortion. Then connect the +12 V terminal of the amplier with the battery by using an appropriate cable including an in-line fuse. This fuse should be located very close to the battery; for safety reasons not more than 30 cm away. Only insert the fuse when the installation, including the connection of the loudspeakers, has been ac- complished. Then connect the remote turn-on-wire from the head unit with the amplier‘s REM terminal. A cable with a cross-section of 0.5 mm

is adequate. LOUDSPEAKER CONNECTIONS - In 4-channel operation (i.e. one loudspeaker on each amplier channel), the impedance must not be lower than 2 ohms for each speaker - In bridging mode (two amplier outputs combined) the impedance must not be lower than 4 ohms for the bridged output. - Never connect loudspeaker cables with the ground of the chassis or the +12 V supply voltage. If the amplier is operated with a too low impedance or incorrectly used, the entire sound system may be dam- aged. This means a warranty void in such cases. IMPORTANT! Always observe the correct polarity of all connections!10

SIGNAL OUTPUTS TO CONNECT ADDITIONAL AMPLIFIERS

The input signal on the INPUT CH1/2 jacks (Fig. 1,5) will be routed in stereo to the output jacks OUTPUT CH1/2 (Fig. 1,6). Thus the OUTPUT jack allows the connection of a additional amplier.

INPUT SENSITIVITY CH1/2 & CH3/4

OPERATING ELEMENTS Turn the GAIN (Fig. 1,4 CH1/2 and g. 1,8 CH3/4) controller of the amplier to the MIN position. Then turn the volume controller of the headunit to 80 - 90% of its full setting. Now turn GAIN clockwise until you hear some distortion. Then turn back the GAIN slightly until you hear a cleaner sound.

VARIABLE HIGH PASS FILTER CH1/2 & CH3/4

If the amplier is to be used for mid-range/tweeter loudspeakers, set the switches FILTER (Fig. 1,3 CH1/2 and g. 1,11 CH3/4) to HPF. Then set the desired crossover frequency on the HPF controller (Fig.1,2 CH1/2 or g. 1,12 CH3/4). Thus to that only the frequencies above the chosen crossover frequency will be amplied. This effectively minimizes distortions and overloads at lower frequencies. A good point to start is at 125 Hz. If you use loudspeakers (>20 cm) set FILTER (Fig. 1,3 CH1/2 and g. 1,11 CH3/4) to FULL. In this case, the HIGH PASS controllers (Fig.1,2 CH1/2 or g. 1,12 CH3/4) are without function. PROTECTION CIRCUIT The POWER/PROTECTION LED (Fig. 1,1) lights up green, if the amplier is in operation. The POWER/PROTECTION LED (Fig. 1,1) lights up red, when the amplier is overheated, or a short circuit occurs resp. a too low impedance load is connected to the speaker outputs. If this events, the internal built-in protection circuit shuts down the amplier automatically. The amplier should work again properly after you have solved the problems.

VARIABLE LOW PASS FILTER CH3/4

If the amplier is used to drive a subwoofer, set the switch FILTER (Fig. 1,11 CH3/4) to „LPF“. Set the desired crossover frequency by using the controller (Fig. 1,10 CH3/4). Thus to that only the frequencies below the cho- sen crossover frequency will be amplied and the subwoofer plays more precised and efcient.

SWITCHABLE BASS BOOST CH3/4

By using the BASS BOOST switch (Fig.1,9 CH3/4) you are able to increase the bass level by 6 or 12 dB. Attention: Use the BASS BOOST wisely!

When installing the audio cables between the RCA outputs of the headunit and the RCA inputs of the amplier, the audio and power supply cables should, if possible, not be routed along the same side of the vehicle. We recommend a separated installation, e.g. routing the power cable through the cable channel on the left side and the audio cables through the cable channel of the vehicle on the right side or vice versa. This prevents interferences due to crosstalk into the audio signal.11 FIGURES (P. 28-30) CONNECTIONS AND CONTROLLERS (FIG. 1) (1) Power-/Protection-LED (2) High pass lter controller CH1/2 (3) Selector FULL / HPF (High pass) CH1/2 (4) Gain level controller CH1/2 (5) Audio signal inputs CH1/2 (6) Audio signal outputs to run additional ampliers (7) Audio signal inputs CH3/4 (8) Gain level controller CH3/4 (9) Bass Boost selector CH3/4 (10) Lowpass lter controller CH3/4 (11) Selector FULL / HPF (High pass) / LPF (Low pass) CH3/4 (12) High pass lter controller CH3/4 POWER SUPPLY AND TURN ON CONNECTION (FIG. 2) (1) GND terminal for the ground (2) REM terminal for the turn on connection (3) +12 V terminal for the positive-connection of the battery (4) Vehicle’s battery (5) In-Line Fuse (not included in the scope of delivery) (6) Turn on wire from the head unit or the electrical antenna (7) Fuse(s) 4-CHANNEL OPERATION STEREO (FIG. 3) If you want to run the amplier with the 4 line output channels* from the head unit to drive 4 loudspeakers, in stereo connect the following setup: (1) To the head unit, line output left FRONT CH1 (2) To the head unit, line output right FRONT CH2 (3) To the head unit, line output left REAR CH3 (4) To the head unit, line output right REAR CH4 (5) Loudspeaker left REAR CH3 (6) Loudspeaker right REAR CH4 (7) Loudspeaker left FRONT CH1 (8) Loudspeaker right FRONT CH2 3-CHANNEL OPERATION STEREO & MONO (FIG. 4) If you want to run the amplier with the 4 line output channels* the head unit to drive a pair of loudspeakers and a subwoofer, connect the following setup: (1) To the head unit, line output left FRONT CH1 (2) To the head unit, line output right FRONT CH2 (3) To the head unit, line output left REAR CH3 or subwoofer output (4) To the head unit, line output right REAR CH4 or subwoofer output (5) Loudspeaker left FRONT CH1 (6) Loudspeaker right FRONT CH2 (7) Subwoofer

• If your head unit only have 2 output channels, use commercially available Y-adapters for splitting the signal. But then the FADER function of the head unit does not work anymore.12 TROUBLESHOOTING If you are having problems after installation follow the Troubleshooting procedures below. Procedure 1: Check Amplier for proper connections. POWER/PROTECTION LED lights up green. In this case skip to Step 3, if not continue.

1. Check in-line fuse on battery positive cable. Replace if necessary.

2. Check fuse(s) on amplier. Replace if necessary.

3. Verify that Ground connection is connected to clean metal on the vehicle’s chassis. Repair/replace if necessary.

4. Verify there is 9 to 16 Volts present at the positive battery and remote turn-on cable. Verify quality connections for both cables at amplier, stereo, and battery/fuse holder. Repair/replace if necessary. Procedure 2: POWER/PROTECTION LED lights up red. 1. If the LED lights up red it is a sign of a possible short in the speaker connections. Check for proper speaker connections and use an ohm meter to check for possible shorts in the speaker wiring. Too low speaker impedance may also cause PROTECTION to light. This can also be a sign of driving the amplier at very high power gains without adequate airow around the amplier. Shut off the system and allow amplier to cool. Check that the vehicle charging system is maintaining proper voltage. If the previous items do not solve the problem, a fault may be in the amplier. In this case you should contact your dealer. Procedure 3: Check Amplier for audio output.

1. Verify good RCA input connections at stereo and amplier. Check entire length of cables for kinks, splices, etc.

Test RCA inputs for AC volts with stereo on. Repair/replace if necessary. Procedure 4: Check Amplier for a popping noise while turning on.

1. Disconnect input signal to amplier and turn amplier on and off.

2. If the noise is eliminated, connect the REMOTE lead of amplier to source unit with a delay turn-on module.

Procedure 5: Check Amplier if you experience excess Engine Noise.

1. Route all signal carrying wires (RCA, Speaker cables) away from power and ground wires.

2. Bypass any and all electrical components between the head unit and the amplier(s). Connect stereo

directly to input of amplier. If noise goes away the unit being bypassed is the cause of the noise.

3. Remove existing ground wires for all electrical components. Reground wires to different locations.

Verify that grounding location is clean, shiny metal free of paint, rust etc.

4. Add secondary ground cable from negative battery terminal to the chassis metal or engine block of vehicle.