GTI 1500 - Car stereo Crunch - Free user manual and instructions

Product type	Monoblock amplifier for car audio
Model	GTI 1500 (GTi1500)
RMS Output Power	1 x 400 W @ 4 Ohm, 1 x 750 W @ 2 Ohm
Max Output Power	1 x 800 W @ 4 Ohm, 1 x 1500 W @ 2 Ohm
Permitted Speaker Impedance	2 – 8 Ohm
Frequency Response	5 – 40 000 Hz (-3 dB)
Total Harmonic Distortion	< 0.05 % (1 kHz)
Signal-to-Noise Ratio	>90 dB
Input Sensitivity	0.2 V – 5 V
Input Impedance	20 kOhm
Low-Pass Filter	40 – 150 Hz @ 12 dB/Octave
Subsonic / High-Pass Filter	15 – 55 Hz @ 12 dB/Octave
Bass Boost	0 – 12 dB @ 45 Hz
Bass Level Remote Control	Included (wired)
Power Supply	+12 V (9 – 15 V), negative ground
Fuse	2 x 50 A (on the amp) + inline fuse (not included)
Dimensions (W x H x D)	251 x 55 x 400/430 mm
Weight	Approximately 3.5 kg
Main Features	Input sensitivity adjustment, low-pass filter, subsonic/high-pass filter, bass boost, bass remote, thermal and short circuit protection
Maintenance and Cleaning	Clean with a dry, soft cloth. Do not use abrasive products.
Safety	Disconnect the battery before installation. Use fuses of the same type and rating. Do not expose to moisture.
Spare Parts and Repairability	Fuses available. For any repairs, contact an authorized center.
General Information	EU warranty upon presentation of the invoice. Complies with European standards.

Frequently Asked Questions - GTI 1500 Crunch

How to connect the GTI 1500 amplifier to the battery?

Disconnect the negative terminal of the battery. Connect the GND terminal of the amp to ground (negative). Connect the +12V terminal via a fuse (50A) within 30 cm of the battery. Finally, connect the REMOTE wire to the remote output of the car stereo.

What to do if the PROTECTION LED lights up?

This indicates a short circuit, too low impedance, or overheating. Check the speaker connections (no short circuit), the impedance (minimum 2 ohms), and ventilation. If the amp overheats, turn it off and let it cool down.

How to adjust the input sensitivity?

Set the car stereo volume to about 75% of its maximum. Turn the Level control (7) until you get a moderate sound volume without distortion. This optimizes the signal-to-noise ratio.

Can I use the amplifier with a 24V battery?

No. The device is designed for a 12V system with negative ground (9-15V). A higher voltage would damage the amplifier.

How to connect a subwoofer in mono mode?

Use both RCA inputs (left and right) of the amp. Connect the subwoofer outputs of the car stereo to these inputs. For a single sub, connect the two + terminals of the sub to the two + outputs of the amp (in parallel) and similarly for the -. Follow the diagram Fig. 3.

The low-pass filter does not seem to work, what to check?

Make sure the switch (5) is set to LP/BP and not HP or FULL. Check that the subsonic filter frequency (6) is lower than the low-pass filter frequency (4), otherwise no sound will come out.

How to reduce engine noise in the speakers?

Keep the RCA and speaker cables away from the power cables. Check the grounds (cleanliness, paint). Add a ground wire from the battery to the chassis. If the noise persists, a noise filter may be necessary.

What is the role of the included bass remote?

It allows you to adjust the bass level (bass boost) remotely, without leaving the driver's seat. Connect it to the designated connector (2) and place it within reach.

Can I install the amplifier in the trunk?

Yes, it is recommended. Ensure good air circulation around the cooling fins. Do not install it in an enclosed space without ventilation (e.g., spare tire well).

What to do if the amp does not turn on (Power LED off)?

Check the inline fuse near the battery, the fuses on the amp (2x50A), the ground connection (clean and solid), and the voltage at the +12V and REMOTE terminals (9-16V).

USER MANUAL GTI 1500 Crunch

Please read the user's manual carefully before the installation and the first operation of the amplifier.

SPECIFICATIONS	GTi750	GTi1500
Output Power RMS	1 x 200 W @ 4 Ohms1 x 375 W @ 2 Ohms	1 x 400 W @ 4 Ohms1 x 750 W @ 2 Ohms
Output Power Max.	1 x 400 W @ 4 Ohms1 x 750 W @ 2 Ohms	1 x 800 W @ 4 Ohms1 x 1500 W @ 2 Ohms
Loudspeaker impedance (stereo)	2 – 8 Ohms	2 – 8 Ohms
Frequency Response	5 – 40 000 Hz (-3 dB)	5 – 40 000 Hz (-3 dB)
Total Harmonic Distortion	< 0,05 % (1 kHz)	< 0,05 % (1 kHz)
Signal-to-Noise Ratio	>90 dB	>90 dB
Input Sensitivity	0,2 V – 5 V	0,2 V – 5 V
Input Impedance	20 kOhms	20 kOhms
Lowpass Filter	40 – 150 Hz @ 12 dB/Octave	40 – 150 Hz @ 12 dB/Octave
Subsonic-/Highpass Filter	15 – 55 Hz @ 12 dB/Octave	15 – 55 Hz @ 12 dB/Octave
Bass Boost	0 - 12 dB	0 - 12 dB
Operating Voltage	+12 V (9 – 15 V), negative ground	+12 V (9 – 15 V), negative ground
Fuse Rating	2 x 25 A	2 x 50 A
Dimensions (B x H x L)	251 x 55 x 250/280 mm	251 x 55 x 400/430 mm

All Specifications are subject to change

WARRANTY

This product meets the current EU minimum warranty requirements, if purchased in countries of the EU. To ensure your warranty policy keep your original receipt proofing the date of purchase. Any damage to the product as a result of misuse, abuse, accident, incorrect wiring, improper installation, alteration of date code or barcode labels, revolution, natural disaster, or any sneaky stuff because someone messed up, repair or alteration out side of our factory or authorized service centers and any thing else you have done that you should not have done is not covered. This warranty is limited to defective parts and specifically excludes any incidental or consequential damages connected therewith.

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LOUDSPEAKER CONNECTIONS

• The total impedance must not be lower than 2 ohms.
• Never connect loudspeaker cables with the ground of the chassis or the +12 V supply voltage.

If the amplifier is operated with a too low impedance or incorrectly used, the entire sound system may be damaged. This means a warranty void in such cases.

SIGNAL OUTPUTS TO CONNECT ADDITIONAL AMPLIFIERS

The input signal on the INPUT jacks (Fig. 1,9) will be routed in stereo to the output jacks OUTPUT (Fig. 1, 8). Thus the OUTPUT jack allows the connection of an additional amplifier.

OPERATING ELEMENTS

INPUT SENSITIVITY

The input sensitivity can be adjusted to any headunit. Turn the volume control of your headunit to the center medium position and then adjust the input level controls (Fig. 1,7) until you have an average medium level. This setting usually provides sufficient power reserves at optimum signal-to-noise ratio.

VARIABLE LOWPASS FILTER

If the amplifier is used to drive a subwoofer, set the switch (Fig. 1, 5) to "LP/BP". Set the desired cross-over frequency by using the controller (Fig. 1, 4). Thus to that only the frequencies below the chosen cross-over frequency will be amplified and the subwoofer(s) plays more accurate and efficient.

VARIABLE SUBSONIC/HIGHPASS FILTER

With the subsonic/highpass controller (Fig. 1,6) you can adjust the lower cross-over frequency in the lowpass mode "LP/BP", to filter the very low frequencies to relieve the subwoofer or to generate a bandpass signal. If you don't want to use this function, turn the controller to the very left to the 15 Hz position.

NOTE: The adjusted value of the subsonic-/highpass controller (Fig. 1,6) should not be higher than the adjusted value of the lowpass controller (Fig. 1,4). Otherwise no sound will be hearable.

If the amplifier is to be used for mid-range/tweeter loudspeakers, set the switch (Fig. 1,5) to "HP". Set the desired cross-over frequency on controller (Fig.1, 6). Thus to that only the frequencies above the chosen cross-over frequency will be amplified. This effectively minimizes distortions and overloads at lower frequencies. For bigger loudspeakers (>20 cm) set the switch (Fig. 1,5) to "FULL". In this configuration the subsonic/highpass controller (Fig.1, 6) is without function.

VARIABLE BASS BOOST

With the bass boost controller (Fig.1, 3) you are able to adjust the bass level from 0 - 12 dB at 45 Hz.

With the included bass level cable remote controller you are able to adjust the bass level e.g. out of the driver's seat.

PROTECTION CIRCUIT

The POWER-LED (fig. 1,1) lits up, if the amplifier is in operation.

The PROTECT-LED (fig. 1, 1) lits up, when the amplifier 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 amplifier automatically. The amplifier should work again properly after you have solved the problems.

FIGURES (P. 28-30)

CONNECTIONS AND CONTROLLERS (FIG. 1)

(1) Power-LED / Protect-LED
(2) Connector for the included bass level remote controller
(3) Bass Boost controller
(4) Lowpass filter controller
(5) Selector LP (Lowpass) / FULL / HP (Highpass)
(6) Subsonic / highpass filter controller
(7) Gain level controller
(8) Audio signal outputs to run additional amplifiers
(9) Audio signal inputs

POWER SUPPLY AND TURN ON CONNECTION (FIG. 2)

(1) GND terminal for the ground
(2) REMOTE 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 headunit or the electrical antenna
(7) Fuses

1-CHANNEL OPERATION MONO (FIG. 3)

If you want to run the amplifier with the 2 line output channels from the headunit to drive one or two subwoofers, connect the following setup:

(1) To the headunit, line output rear left or subwoofer output
(2) To the headunit, line output rear right or subwoofer output
(3) Bass level remote controller
(4) Operation with 1 subwoofer
(5) Operation with 2 subwoofers

2-CHANNEL OPERATION STEREO (FIG. 4)

If you want to run the amplifier with another amplifier (same model) to drive 2 loudspeakers in stereo, connect the following setup:

(1) Amplifier 1 via Y-Connector*, to the headunit, line output left
(2) Amplifier 2 via Y-Connector*, to the headunit, line output right
(3) Loudspeaker left
(4) Loudspeaker right

* both jacks under INPUT L/R must be connected.

TROUBLESHOOTING

If you are having problems after installation follow the Troubleshooting procedures below.

Procedure 1:

Check Amplifier for proper connections.

Verify that POWER LED is on. If POWER LED is on skip to Step 3, if not continue.

1. Check in-line fuse on +12V power supply cable. Replace if necessary.
2. Check fuses on amplifier. 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 are 9 to 16 Volts present at the +12V power supply and the remote turn-on cable. Verify quality connections for both cables at amplifier, stereo, and battery/fuseholder. Repair/replace if necessary.

Procedure 2:

PROTECT LED is on.

1. If the PROTECT LED lits up, 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 PROTECT LED to lit up. This can also be a sign of driving the amplifier at very high power levels without adequate airflow around the amplifier. Shut off the system and allow amplifier 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 amplifier.

Procedure 3:

Check Amplifier for audio output.

1. Verify good RCA input connections from the head unit to the amplifier. Check the entire length of cables for kinks, splices, etc. Verify an audio signal at INPUT, use e.g. another audio source for testing. Repair/replace if necessary.

Procedure 4:

Check Amplifier for a popping noise while turning on.

1. Disconnect input signal to amplifier and turn amplifier on and off.
2. If the noise is eliminated, replace the head unit or repair it.

OR

1. Use a different 12 Volt source for REMOTE lead of amplifier.
2. If the noise is eliminated, use a relay to isolate the amplifier from noisy turn-on output.
   IMPORTANT: Never use the steady plus of the vehicle's battery. Use rather the ignition circuit for the power supply.
   Otherwise the vehicle's battery may be discharged.

Procedure 5:

Check Amplifier if you experience excess Engine Noise.

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

OR

1. Bypass any and all electrical components between the headunit and the amplifier(s). Connect stereo directly to input of amplifier. If noise goes away the unit being bypassed is the cause of the noise.

OR

1. Remove existing ground wires for all electrical components. Reground wires to different appropriate locations. Verify that grounding location is clean, shiny metal free of paint, rust etc.

OR

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

OR

1. Have alternator and battery load tested by your mechanic. Verify good working order of vehicle electrical system including distributor, spark plugs, spark plug wires, voltage regulator etc.

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