Ground Zero Uranium GZUA 4.150SQ-PLUS Service Manual

URANIUM-SERIES

AMPLIFIER

GZUA 2.250SQ-PLUS GZUA 4.150SQ-PLUS GZUA 6.200SQ-PLUS

OWNER’S MANUAL

Common Features

 2 Ohm stable stereo (GZUA 4.150SQ-PLUS & 6.200SQ-PLUS)  1 Ohm stable stereo (GZUA 2.250SQ-PLUS)  Adjustable BIAS control (for each pair of channels separately)  High End WIMA  Latest BURR-BROWN  Status LED  Wide-band adjustable high pass & low pass filters  Band-pass feature with activated LPF & HPF  Adjustable input sensitivity  Soft delayed remote turn on  Bass remote control (GZUA 2.250SQ-PLUS with activated LPF)  Phase shift control (GZUA 2.250SQ-PLUS with activated LPF)  Bass boost control from 0 - 12dB @45 Hz(GZUA 2.250SQ-PLUS)  Thermal / speaker short circuit / overload / over current protection  Temperature sensor controlled cooling fan

Capacitors

operational amplifiers

GZUA 2.250SQ-Plus / GZUA 4.150SQ-Plus

GZUA 6.200SQ-Plus

Speaker wires

min 2.5 mm² / 13 AWG

Power supply wires

min 20.0 mm² / 4 AWG

min. 35.0 mm² / 2 AWG

Remote wire

min 0.75 mm² / 20 AWG

Mounting instructions

Recommended wiring

 As a precaution, it is recommended to disconnect the vehicles battery before mounting (also note the vehicles manual!)  The power supply wire (+12 V) has to be protected within max. 20 cm / 8” by a main fuse holder with matching fuse value

(Main fuse value has to be equal to the sum of values of the fuses of each connected device)

 If necessary, replace a defective fuse by a new one with identical value  Never drill a hole to the vehicles gas tank or brake lines, to wirings or any other important vehicle part!  Never pass wires over sharp edges or vehicle parts  Keep the wiring away from the antenna and electronic devices contributing to radio reception  Install the power supply wiring locally separated from the speaker wiring  The amplifier contains a temperature protection circuit that turns the device off in case of overheating. After a certain cooling

time the amplifier will turn on again automatically. To avoid heat build-up, it´s necessary to provide sufficient air supply for

the amplifier cooling. Therefore, never cover the surface of the heatsink entirely.

 The amplifier should not be mounted on a strongly vibrating part or surface (e.g. subwoofer enclosure)  If a pre-amplified output (RCA) is available (on the head unit) it is recommended to make use of them

WARNING !

Powerful car audio systems are able to create extremely high SPL similar to real live concert levels. Permanent exposure to excessively high

sound levels may cause damage to or loss of the hearing.

Furthermore, operation of a motor vehicle while listening to audio equipment at high volume levels may impair your ability to concentrate

on road traffic and external sounds such as horns, warning signals or emergency vehicles. In the interest of general and own safety, it is

recommended to listen to music at appropriately low volume levels while driving.

Controls & Features – GZUA 2.250SQ-PLUS

Controls & Features – GZUA 4.150SQ-PLUS

Controls & Features – GZUA 6.200SQ-PLUS

INPUT sockets

Input sockets to connect RCA wires - to avoid any malfunction, it is recommended to use only high quality RCA cables Cable recommendation: GZCC X-TP series (available lengths 0.57 / 1.14 / 3.14 / 5.49 m)

LEVEL control

Controller to adjust the input sensitivity of the according pair of channels

Crossover activation switch*

Push the switch to the ON position to activate the high pass filter

Crossover multiplication switch

Push the switch to the X10 position to multiply the selected frequency by the factor of 10 The crossover frequency range will change from 20 – 400 Hz to 200 – 4000 Hz

HIGH PASS filter controller*

Adjust the required crossover point using the controller. Frequencies below the selected crossover point will be filtered (20 to 400 Hz / 200 to 4000 Hz).

Crossover activation switch*

Push the switch to the ON position to activate the low pass filter

Crossover multiplication switch

Push the switch to the X10 position to multiply the selected frequency by the factor of 10 The crossover frequency range will change from 20 – 400 Hz to 200 – 4000 Hz

LOW PASS filter control*

Adjust the required crossover point using the controller. Frequencies above the selected crossover point will be filtered (20 to 400 Hz / 200 to 4000 Hz)

BANDPASS feature

Bandpass filter is activated as soon as high and low pass switches are in the ON position Depending on the multiplication switch the bandpass filter range varies from 20 to 4000 Hz

SPEAKER terminal

To connect the speaker wires in stereo or bridged mode

Status LED

POWER -> white -> ok (correct operation) PROTECT -> red -> error / protection

Fuses

Replace defective fuses always using fuses with identical value

POWER supply

terminal

BATT +

Connect to a positive power wire from the battery terminal (12 Volt)

REMOTE

Connect to the remote output wire of the head unit or DSP/pre-amplifier

GND

Connect to a wire from the ground terminal of the battery or to chassis ground

PHASE control

Activating switch and controller (0 to 180˚)

BASS BOOST control

Controller to adjust the bass boost level ( from 0 to +12 dB @ 45 Hz)

BASS REMOTE socket

Connect the wire of the bass remote control

9 10

INPUT MODE 2 switch INPUT MODE 4 switch

INPUT MODE 2 “OFF” and INPUT MODE 4 ”OFF” Each input channel provides signal to the according channel

INPUT MODE 2 “ON” and INPUT MODE 4 ”OFF” Input CH1 provides signal to CH1 & CH3 & CH5 Input CH2 provides signal to CH2 & CH5 & CH6

INPUT MODE 2 “OFF” and INPUT MODE 4 ”ON” Input CH1 provides signal to CH1 Input CH2 provides signal to CH2 Input CH3 provides signal to CH3 and CH5 Input CH5 provides signal to CH5 and CH6

Controls & Features GZUA SQ-PLUS series amplifiers

Additional Controls & Features GZUA 2.250SQ-PLUS

Additional Controls & Features GZUA 6.200SQ-PLUS

BIAS setting

The BIAS setting affects the operation mode of the amplifier. It is continuously adjustable from <MIN> (actual Class A/B mode) to <MAX> (close to Class A mode). An amplifier in Class A mode sounds warm and creates a pleasant atmosphere. Compared to that, the Class A/B mode of an amplifier sounds more direct and dynamic. Depending on the BIAS setting, the current consumption of the amplifier is growing the closer the operation comes to the Class A mode leading to an increased temperature. The power rating however, remains identical. The BIAS can be set using the control on the bottom of the amplifier for each pair of channels, independently.

Power wiring – GZUA amplifier series

Input & output stereo wiring – GZUA 2.250SQ-PLUS

Speakers 1-4 Ω

Speakers 2-4 Ω

Subwoofer 4 Ω

Subwoofer 2-4 Ω

Input & output bridged wiring – GZUA 2.250SQ-PLUS

Input & output stereo wiring – GZUA 4.150SQ-PLUS

Input & output 3-channel wiring – GZUA 4.150SQ-PLUS

Input & output bridged wiring – GZUA 4.150SQ-PLUS

SET INPUT MODE

INPUT MODE 2 to “ON” position INPUT MODE 4 to “OFF” position

Subwoofer 4 Ω

Speakers 2-4 Ω

Subwoofer 4 Ω

Input & output stereo/bridged wiring – GZUA 6.200SQ-PLUS – 2 channel input

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