GTR420.2 - Car stereo Crunch - Free user manual and instructions

USER MANUAL GTR420.2 Crunch

1600 WATTS CRUNCH GTR640.4

GTR PRO SERIES

Owner's Manual in English from Page 13

GTR420.2 - GTR620.2 - GTR440.4 - GTR640.4

Installationshinweise

3D rendering of a heat exchanger or cooling unit with labeled 'CRUWEK' on the cover and three vertical supports (no other text or symbols)

Top-down line drawing of a car front view showing two side-mounted seats and a central seat (no text or symbols)

Kabelanschlüsse

Top-down line drawing of a car interior with a funnel and seat (no text or symbols)

Kabelanschlüsse

Top-down line drawing of a car interior layout with no text or symbols

Kabelanschlüsse

Top-down schematic of a car interior showing front, rear, and side views with speakers and battery (no text or symbols)

Kabelanschlüsse

Top-down line drawing of a car interior with no text or symbols

Kabelanschlüsse

Installation of the Amplifier, Electrical Connection 14

2-CHANNEL AMPLIFIER GTR420.2 - GTR620.2

Functions & Controls 15

2-Channel-Mode: 2 Speakers / Stereo 16

1-Channel-Mode: 1 Subwoofer / Mono bridged 17

4-CHANNEL AMPLIFIER GTR440.4 - GTR640.2

Functions & Controls 18

4-Channel-Mode: 2 Frontspeakers / Stereo & 2 Rearspeakers / Stereo 19

2-Channel-Mode TWIN SUB: 2 Subwoofer / Mono bridged 20

3-Channel-Mode: 2 Speakers / Stereo & 1 Subwoofer / Mono Bridged 21

TROUBLE SHOOTING 22

SPECIFICATIONS 23

Installation & Electrical Connection GTR420.2 - GTR620.2 - GTR440.4 - GTR640.4

General Installation Notes

A car audio amplifier is generally mounted in the rear trunk area but can be mounted in any convenient area such as beneath a seat. Please be sure to locate this unit where you have reasonable air circulation and protection from moisture. When considering the mounting location you should minimize the length of the power and speaker leads. Minimizing both leads will yield a more reliable installation. It is also important to ensure that the heat sink fins are not against a panel or a surface, preventing air circulation. Do not install the amplifier on a subwoofer box or on vibrating parts of the vehicle, since the vibrations can cause damage to the amplifiers electrical components.

Installation of the Amplifier

Mark the location for the mounting screw holes by using the amplifier as a template. Drill holes at the marked locations and firmly fasten the amplifier in place with the mounting screws supplied in the accessory kit. Before drilling or cutting any holes, investigate the layout of your automobile thoroughly: Take care when working near the gas lines or hydraulic lines and electrical wiring of your car.

Electrical Connection

Ground (GND)

This wire is the electrical ground and must be fastened securely to the vehicle chassis. The best method is to use a threading sheet metal screw since the threads cut into bare metal. Ensure that all paint or other insulation is remove from around the hole area, and using self tapping screw, securely affix the bare wire ends to the vehicle chassis. Use as short a piece of cable as possible - use the same gauge as was used for the +12V cable. Make sure that the connection is safe, a loose connection may result in amplifier noise and fault condition.

3D diagram of a heat exchanger unit with labeled 'CRUWEI' and vertical connections (no readable text or symbols beyond branding)

Remote (REM)

Many music sources have an output terminal for connection of the remote turn-on of the power amplifier. If a radio doesn't have a remote turn-on feature, then you can use the antenna relay wire, which activates the antenna motor. Please note, if the power antenna retracts when the radio is operating, then you cannot use the antenna relay wire to operate the remote turn-on.

Battery Connection (+12V)

This wire is usually connected directly to the positive battery terminal. Ensure that the + power supply wire is fused via an assigned fuse in line with the + power supply wire. Please use a sufficient gauge for the installed amplifiers (min 16-25 mm). This connection must be completed using spade lug with insulating sleeve.

Fuses

The integrated amplifier fuses protect the units from short circuit and overload. The fuse rating is for 4 Ohm loads (impedance) of the speakers, for 2 Ohm loads the fuses may have to get increased in case of higher power consumption.

Power / Ground / Remote Connection

Battery Fuse Remote Chassis Ground

2 Channel Amplifier - Functions & Controls

GTR420.2 - GTR620.2

X-OVER - Switch Select the desired Operation-Mode. Position HP - High pass filter ist activated and the frequency range is cut-off below. Position FULL - Full range output signal Position LP/BP - Low pass filter ist activated and the frequency range is cut-off above. HIGH-/LOWPASS - Control HIGH PASS - The built-in high pass filter is fully variable from 10Hz to 1200Hz and cut-off the lower frequencies. By choosing the LP/BP mode on the X-OVER switch, the BANDPASS-Mode is activated. By adjusting the HIGH PASS Controller, the Subsonic-Frequency (Lower Frequency Cut-Off) is adjustable. LOW PASS - The built-in low pass filter is fully variable from 30Hz to 150Hz and cut-off the higher frequencies. BASS BOOST - Control Allows you to adjust the bass boost from 0dB up to 12dB at 45 Hz. POWER - LED Indicates the amplifier is in operation-mode. LEVEL INPUT - Control Adjusts line level (RCA) inputs from 0.2 to 4 Volts INPUT - RCA Allows to connect the amplifier with the head unit via RCA cable. OUTPUT- RCA Provides a full range line level (RCA) output that allows the use of additional amplifiers. BASS REMOTE - Terminal Terminal jack for the supplied BASS REMOTE. With this remote you are able to adjust the Bass Level for example from the driver's seat.

PROTECT - LED

Indicates the fault operation of the amplifier. When the fault conditions (overload, excessive heat or short circuit of speaker) arise, the protection circuit is engaged to protect the speakers and the amplifier against damage.

Attend in this case TROUBLE SHOOTING on page 22.

2 Channel Amplifier - Speaker- & RCA-Connection GTR420.2 - GTR620.2

2-Channel-Mode: 2 Speakers / Stereo

Top-down line drawing of a car front view showing two side-mounted windows and a patterned seat (no text or symbols)

Cable connection

• Connect INPUT of the amplifier to the head unit line output with good quality RCA cables. By connecting the RCA jacks OUTPUT with a additional amplifier, a full range signal will be provided to the amplifier.
• Connect the speakers with the terminal block (SPEAKER OUTPUT + L - und + R -) of the amplifier.
• The minimum final speaker impedance must not be below 2 Ohm per channel. Too low speaker loads result in too high heat dissipation and may cause the amplifier run into protection.
• Please observe speaker channel and polarity as printed by the speaker terminal block. Incorrect phasing of the speakers results in total loss of bass response.

Caution

Please avoid to connect speaker (-) to the ground or vehicle chassis.

X-OVER - Switch & Control

• If larger than 20 cm speakers are used, the "FULL" position is recommended.
• For all smaller speakers (8.7cm - 16cm) the "HP"-Position (HIGH PASS) is recommended, which eliminates the lowest frequencies and protects the speakers from damage. Set the crossover-frequency between 10Hz - 1200Hz, depending on the size of the installed speakers. The Highpass adjustment can be done with the HIGH PASS control. In this configuration the LOW PASS control is not in use.

LEVEL INPUT - Control

• Turn the LEVEL INPUT - Control on the amplifier to "4V" position.
• Turn the head unit volume control to about 80 - 90% of its full setting.
• Turn the LEVEL INPUT - Control clockwise until you hear some distortion.
• Then turn back the LEVEL INPUT - control slightly until you can hear clean sound.

BASS BOOST - Control

- Turn the BASS BOOST - Control into "0dB" - position.

BASS REMOTE

- In this configuration the BASS REMOTE is not in use.

Connect RCA cable from head-unit with RCA input INPUT). CRUNCH Speakers (Right) 2 - 8 Ohms Speakers (Left) 2 - 8 Ohms

2 Channel Amplifier - Speaker- & RCA-Connection GTR420.2 - GTR620.2

1-Channel-Mode: 1 Subwoofer / Mono bridged

Top-down line drawing of a car interior with a speaker and sound block (no text or symbols)

Cable connection

• Connect INPUT of the amplifier to the head unit line output with good quality RCA cables. By connecting the RCA jacks OUTPUT with a additional amplifier, a full range signal will be provided to the amplifier.
• Connect the subwoofer with the terminal block (SPEAKER OUTPUT + BRIDGED -) of the amplifier.
• The minimum final subwoofer impedance must not be below 4 Ohm per channel pair. Too low speaker loads result in too high heat dissipation and may cause the amplifier run into protection.
• Please observe speaker channel and polarity as printed by the speaker terminal block. Incorrect phasing of the speakers results in total loss of bass response.

Caution

Please avoid to connect speaker (-) to the ground or vehicle chassis.

X-OVER - Switch & Control

• For the operation with one subwoofer select at X-OVER "LP/BP" (LOW PASS/BANDPASS).
  Adjust a frequency between 30Hz - 150Hz, depending on the size and response of the Subwoofer.
  The Lowpass adjustment can be done with the LOW PASS control.
• The HIGH PASS - Control is working in this configuration as controller to adjust the Subsonic-Frequency (lower Frequency Cut-off). Therewith a BANDPASS-Signal will be generated, where too low and not hearable frequencies will be eliminated. Thereby a clean and powerful Bass-Signal will be generated. The adjustable level depends on the size and response of the subwoofer and should be between 10Hz (no cut-off) and 30Hz (max. suggested Level).
  NOTE: If the HIGH PASS - Level is higher than the LOW PASS - Level, no Sound is hearable.

LEVEL INPUT - Control

• Turn the LEVEL INPUT - Control on the amplifier to "4V" position.
• Turn the head unit volume control to about 80-90% of its full setting.
• Turn the LEVEL INPUT - Control clockwise until you hear some distortion.
• Then turn back the LEVEL INPUT - Control slightly until you can hear clean sound.

BASS BOOST - Control

• The BASS BOOST - Control adjusts the bass level at 45 Hz from 0 up to 12dB. Please use the Bass-Boost carefully.

BASS REMOTE

- The BASS REMOTE allows to control the Bass-Level for example from the driver's seat.

BASS REMOTE Connect RCA cable from head-unit with RCA input (INPUT). CRUNCH Subwoofer 4 - 8 Ohm

4 Channel Amplifier - Functions & Controls

GTR440.4 - GTR640.4

X-OVER - Switch CH1/2 and CH3/4 Select the desired Operation-Mode. Position HP - High pass filter ist activated and the frequency range is cut-off below. Position FULL - Full range output signal Position LP/BP - Low pass filter ist activated and the frequency range is cut-off above. HIGH-/LOWPASS - Control CH1/2 and CH3/4 HIGH PASS - The built-in high pass filter is fully variable from 10Hz to 1200Hz and cut-off the lower frequencies. By choosing the LP/BP mode on the X-OVER switch, the BANDPASS-Mode is activated. By adjusting the HIGH PASS Controller, the Subsonic-Frequency (Lower Frequency cut-off) is adjustable. LOW PASS - The built-in low pass filter is fully variable from 30Hz to 150Hz and cut-off the higher frequencies. BASS BOOST - Control CH1/2 and CH3/4 Allows you to adjust the bass boost from 0dB up to 12dB at 45 Hz. POWER - LED Indicates the amplifier is in operation-mode. LEVEL INPUT - Control CH1/2 and CH3/4 Adjusts the line level (RCA) inputs from 0.2 to 4 Volts. TWIN SUB - Switch When this Switch is set to "ON" the same adjusted Parameters of CH 3/4 for HIGH PASS, LOW PASS and BASS BOOST are taking effect on CH1/2. Only the INPUT LEVEL must be adjusted. This is only suitable for an operation with 2 subwoofers. OUTPUT- RCA Provides a full range line level (RCA) output that allows the use of additional amplifiers BASS REMOTE - Terminal Terminal jack for the supplied BASS REMOTE. With this remote you are able to adjust the Bass Level for example from the driver's seat. LINE INPUT - RCA Allows to connect the amplifier with the head unit via RCA cable. INPUT MODE - Switch If on LINE INPUT only CH1/2 is occupied, switch to the "2CH" Position. If all four jacks are in use, switch to "4CH" position.

PROTECT - LED

Indicates the fault operation of the amplifier. When the fault conditions (overload, excessive heat or short circuit of speaker) arise, the protection circuit is engaged to protect the speakers and the amplifier against damage.

Attend in this case TROUBLE SHOOTING on page 22.

4 Channel Amplifier - Speaker- & RCA-Connection GTR440.4 - GTR640.4

4-Channel-Mode: 2 Frontspeakers / Stereo & 2 Rearspeakers / Stereo

Top-down line drawing of a car interior with no text or symbols

Cable connection

• Connect INPUT of the amplifier to the head unit line output with good quality RCA cables. By connecting the RCA jacks OUTPUT with a additional amplifier, a full range signal will be provided to the amplifier.
• Connect the speakers with the terminal block (CH1 +/- und CH2 +/- SPEAKER) and (CH3 +/- und CH4 +/- SPEAKER) of the amplifier.
• The minimum final speaker impedance must not be below 2 Ohm per channel. Too low speaker loads result in too high heat dissipation and may cause the amplifier run into protection.
• Please observe speaker channel and polarity as printed by the speaker terminal block. Incorrect phasing of the speakers results in total loss of bass response.

Caution

Please avoid to connect speaker (-) to the ground or vehicle chassis.

X-OVER - Switch & Control CH1/2 and CH3/4

• If larger than 20 cm speakers are used, the "FULL" position is recommended.
• For all smaller speakers (8.7cm - 16cm) the "HP"-Position (HIGH PASS) is recommended, which eliminates the lowest frequencies and protects the speakers from damage. Set the crossover-frequency between 10Hz - 1200Hz, depending on the size of the installed speakers. The Highpass adjustment can be done with the HIGH PASS - Control. In this configuration the LOW PASS - Control is not in use.

LEVEL INPUT - Control CH1/2 and CH3/4

• Turn the LEVEL INPUT - Control on the amplifier to "4V" position.
• Turn the head unit volume control to about 80 - 90% of its full setting.
• Turn the LEVEL INPUT - Control clockwise until you hear some distortion.
• Then turn back the LEVEL INPUT - Control slightly until you can hear clean sound.

BASS BOOST CH1/2 and CH3/4

- Turn the BASS BOOST - Control into "0dB" - position.

BASS REMOTE

- In this configuration the BASS REMOTE is not in use.

Connect RCA outputs from head-unit with RCA inputs (LINE INPUT CH1/2 & CH3/4). CRUNCH Rearspeakers 2 - 8 Ohm Frontspeakers 2 - 8 Ohm

4 Channel Amplifier - Speaker- & RCA-Connection GTR440.4 - GTR640.4

2-Channel-Mode: 2 Subwoofers / Mono bridged

Top-down line drawing of a car interior with two speakers and a battery (no text or symbols)

Cable connection

• Connect the INPUT of the amplifier to the head unit line output with a good quality RCA cable. By connecting the RCA jacks OUTPUT with a additional amplifier, a full range signal will be provided to the amplifier.
• Connect the subwoofers with the terminal block (CH1/2 + BRIDGED - SPEAKER OUTPUT and CH3/4 + BRIDGED - SPEAKER OUTPUT) of the amplifier.
• The minimum final subwoofer impedance must not be below 4 Ohm per channel. Too low speaker loads result in too high heat dissipation and may cause the amplifier run into protection.
• Please observe speaker channel and polarity as printed by the speaker terminal block. Incorrect phasing of the speakers results in total loss of bass response.

Caution

Please avoid to connect speaker (-) to the ground or vehicle chassis.

TWIN SUB - Switch CH1/2

• The TWIN SUB - Switch must be set this configuration to "ON"-Position.
• The controllers for HIGH PASS, LOW PASS and BASS BOOST for CH1/2 are in this configuration not in use.
  The parameters for HIGH PASS, LOW PASS and BASS BOOST for CH1/2 will be taken from CH3/4.

INPUT MODE - Switch

- The INPUT MODE - Switch must be set in this congruration to "2CH"-Position.

X-OVER - Switch & Control CH3/4

• See page 17.

LEVEL INPUT - Control

• See page 17.

BASS BOOST - CONTROL CH3/4

- The BASS BOOST - Control increases the bass level at 45 Hz from 0 up to 12dB. Please use the Bass-Boost carefully.

BASS REMOTE

- The BASS REMOTE allows to control the Bass-Level of Subwoofer 1 on CH1/2 and Subwoofer 2 on CH3/4 simultaneously for example from the driver's seat.

BASS REMOTE Connect RCA outputs from head-unit with RCA inputs (LINE INPUT CH1/2). CRUNCH Subwoofer 2 4 - 8 Ohm Subwoofer 1 4 - 8 Ohm

4 Channel Amplifier - Speaker- & RCA-Connection GTR440.4 - GTR640.4

3-Channel-Mode: 2 Speakers/Stereo & 1 Subwoofer / Mono bridged

Top-down line drawing of a car interior with no text or symbols

Cable connection

• Connect the INPUT of the amplifier to the head unit line output with good quality RCA cables. By connecting the RCA jacks OUTPUT with a additional amplifier, a full range signal will be provided to the amplifier.
• Connect the speakers with the terminal block (CH1 +/- & CH2 +/- SPEAKER OUTPUT and the subwoofer with CH3/4 + BRIDGED - SPEAKER OUTPUT) of the amplifier.
• The minimum final speaker impedance must not be below 2 Ohm per channel and 4 Ohm (Subwoofer) per channelpair. Too low speaker loads result in too high heat dissipation and may cause the amplifier run into protection.
• Please observe speaker channel and polarity as printed by the speaker terminal block. Incorrect phasing of the speakers results in total loss of bass response.

Caution

Please avoid to connect speaker (-) to the ground or vehicle chassis.

X-OVER Switch & Control (Front- or Rearspeakers on CH1/2)

• See page 19.

X-OVER Switch & Control (Subwoofer on CH3/4)

• See page 17.

INPUT LEVEL - Control (CH1/2 & CH3/4)

• See page 19.

TWIN SUB - Switch CH1/2

- The TWIN SUB - Switch must be set in this configuration to "OFF" - Position.

BASS BOOST - Control (Subwoofer on CH3/4)

• The BASS BOOST - Control adjusts the bass level at 45 Hz from 0dB up to 12dB. Caution! Please use the Bass-Boost carefully.

INPUT MODE - Switch

- The INPUT MODE - Switch must be in "2CH" - position (if LINE INPUT is occupied only on CH1/2) or to "4CH" - position (if LINE INPUT is occupied on all four jacks).

BASS REMOTE Connect RCA outputs from head-unit with RCA inputs (LINE INPUT CH1/2 and CH3/4). CRUNCH Speakers 2 - 8 Ohm Subwoofer 4 - 8 Ohm

Trouble Shooting

System does not turn on

1. Check all fuses.
2. Check all connections.
3. Measure the +12 volt and remote turn on voltages at the amplifier terminals. If these are non existent or too low, take voltage measurements at fuse holders, distribution blocks, the head unit's +12 volt and remote leads to localize the problem.

Noise problems

1. Check the speaker wiring
2. Speakers are damaged

No Signal at Channels

1. Set Balance and Fader from head unit on Zero-Position
2. Check wiring (Amplifier, Speakers)
3. Speakers are damaged
4. In LP/BP - Mode the HIGH PASS - Control is adjusted too high. Turn the Control back.

Hiss or white noise

1. Speakers are overload
2. High levels of white noise usually occurs when amplifier level controls are turned up too high.
3. Another major problem that can cause excessive hiss, is a noisy head unit - unplug the amplifier input RCA cables, and if the hiss level reduces, the source unit is at fault.

No Stereo-Sound or Low Output

1. Check speaker wiring (- and +)

Amplifier Protect-Mode (the LED lights up red)

1. Speaker cables are shorted
2. Inadequate cooling - relocate or remount to provide better natural airflow. Driving high power levels into low impedances - back off on the volume control, and/or make sure you are not loading the amplifier with less than the recommended loudspeaker impedance.
3. Make sure that the battery voltage, as measured at the amplifier's +12 volt and ground terminals, is 11 volts or more.

Electrical Interferences

The inside of an automobile is a very hostile electrical environment. The multitude of electrical systems, such as the ignition system, alternator, fuel pumps, air conditioners to mention just a few, create radiated electrical fields, as well as noise on the +12 volt supply and ground. Remember to isolate the problem - first unplug amplifier input RCA cables, if the noise is still present, check the speaker leads, if not, plug the RCA's back, and investigate the source driving the amplifier, one component at a time.

A ticking or whine that changes with engine RPM:

1. This problem could be caused by radiation pickup of RCA cables too near to a fuel pump or a distributor, for instance, - relocate cables.
2. Check that the head unit ground is connected straight to the vehicle chassis, and does not use factory wiring for ground.
3. Try to supply the head unit with a clean +12 volt supply directly from the battery +, instead of using a supply from the in dash Wiring/fusebox. This type of noise can be more difficult to pinpoint, but is usually caused by some kind of instability, causing oscillations in the system.

A constant whine:

1. Check all connections, especially for good grounds.
2. Make sure that no speaker leads are shorting to exposed metal on the vehicle chassis.
3. RCA cables are notorious for their problematic nature, so check that these are good, in particular the shield connections.

Caution!

In your amplifier are protection circuits integrated. Short Circuit Protection engaged: The amplifier will turn off and try to come back immediately. The amplifier will cycle like this indefinitely, with "blips" of sound each time. If this is the case, check your speakers and wiring for low impedance and short circuits. Thermal Protection engaged: The amplifier will turn off and several minutes later will come back on. In this case, ensure that there is nothing blocking the normal convective airflow of the amplifier. If the display is still lighting up red, the amplifier is damaged.

Specifications

	GTR 420.2	GTR 620.2	GTR 440.4	GTR 640.4
Channels	2	2	4	4
Output Power Ratings @ 14.4 Volt
Watt MAX. @ 4 Ohm	2 x 200	2 x 300	4 x 150	4 x 200
Watt MAX. @ 2 Ohm	2 x 400	2 x 600	4 x 300	4 x 400
Watt RMS @ 4 Ohm	2 x 100	2 x 150	4 x 75	4 x 100
Watt RMS @ 2 Ohm	2 x 200	2 x 300	4 x 150	4 x 200
Output Power Ratings @ 14.4 Volt bridged
Watt MAX. @ 4 Ohm	1 x 800	1 x 1200	2 x 600	2 x 800
Watt RMS @ 4 Ohm	1 x 400 1 x 600 2 x 300 2 x 400
Frequency Response -3dB	20Hz - 30KHz	20Hz - 30KHz 20Hz - 30KHz 20Hz - 30KHz
Damping Factor	>200	>200	>200	>200
Signal-to-Noise Ratio	>90 dB	>90 dB	>90 dB	>90 dB
Channel Separation	>70 dB	>70 dB	>70 dB	>70 dB
THD&N	<0,10 %	<0,10 %	<0,10 %	<0,10 %
Input Sensitivity	0,2 - 4 Volt	0,2 - 4 Volt	0,2 - 4 Volt	0,2 - 4 Volt
Input Impedance	>47 kOhm	>47 kOhm	>47 kOhm	>47 kOhm
Crossover CH1 & CH2
LP/BP, HP, FULL	yes yes yes yes
Variable High Pass	10Hz - 1200Hz	10Hz - 1200Hz	10Hz - 1200Hz	10Hz - 1200Hz
Variable Low Pass	30Hz - 150Hz	30Hz - 150Hz	30Hz - 150Hz	30Hz - 150Hz
Bass-Boost @ 45Hz	0 - 12 dB	0 - 12 dB	0 - 12 dB	0 - 12 dB
Crossover CH3 & CH4			yes yes
LP/BP, HP, FULL
Variable High Pass			10Hz - 1200Hz	10Hz - 1200Hz
Variable Low Pass			30Hz - 150Hz	30Hz - 150Hz
Bass-Boost @ 45Hz			0 - 12 dB	0 - 12 dB
RCA-Outputs	Full range	Full range	Full range	Full range
Input Mode-Switch			4CH/2CH	4CH/2CH
Twin Sub-Switch			yes yes
Fuses	2 x 25 A	4 x 20 A 2 x 25 A	4 x 20 A
Dimensions in mm
Width x Heigth	255 x 53	255 x 53	255 x 53	255 x 53
Length Heat Sink	250/280	320/350	320/350	400/430