Boss Audio Systems Car Speaker GT 1580 User Manual

CONTENTS  
Congratulations! 3  
Specifications 3  
Features 4  
A M P L I F I E R S  
About Protection Circuitry 5  
Amplifiers and 2 Ohm Operation 5  
Electrical Wiring 6  
Mounting the Amplifier 6  
High Input Wiring 7  
Mode Switch Settings 8  
Low Level Input Wiring 9  
Four Channel Amplifier Speaker Wiring 10  
GT1180  
GT1380  
GT1480  
GT1580  
Bridged Speaker Wiring with a Four Channel Amplifier 10  
Dual Tri-Mode Speaker Wiring with a Four Channel Amplifier 11  
Five Channel Amplifier Speaker Wiring 12  
Bridged Speaker Wiring with a Five Channel Amplifier 12  
Dual Tri-Mode Speaker Wiring with a Five Channel Amplifier 13  
Precautions 14  
Troubleshooting 15  
Built-in Crossover  
All GT amplifiers feature built-in electronic crossovers.  
A M P L I F I E R S  
The MonoBlock amplifier (GT1000M) features an continuously-variable low pass and an  
+18dB Bass Boost switch.  
F E A T U R E S  
The 2 Channel, 4 Channel and 5 Channel GT amplifiers feature continuously-variable low  
pass crossovers and fixed high pass crossovers. They also all feature a +18 dB Bass Boost switch.  
Four Channel Amplifiers  
GT1180, GT 1380, GT1480  
All GT amplifiers have been designed to utilize100% MOSFET power supplies, ensuring  
extremely rapid switching response for plenty ofclean power.  
Four Channel Bridgeable MOSFET Amplifier  
Tri-Mode Capable  
Heavy-duty Aluminum Alloy Heatsink  
Class A-B Operation  
Protection Circuitry  
The amplifier protection circuitry will disable the amplifier if the inputs are overloaded,  
short-circuited or if extremely high temperature conditions are detected. When the protection  
mode is in operation, the LED indicator on the front panel will be illuminated, indicating  
the amplifier has gone into a self-preservation mode.  
Continuously-Variable LowPass Crossover: 45Hz-90Hz  
Bass Boost Switch: 0 to +18dB  
Remote Subwoofer Level Control  
Continuously-Variable Input Gain Control  
High Pass Crossover: 200Hz  
4
5
Nickel Plated RCA And Speaker Level Inputs  
Remote Turn-On/Turn-Off Circuit  
MOSFET Pulse Width Modulated Power Supply  
2 Ohm Stable Stereo Operation with Output Power Increase  
Soft Turn-On Circuit  
If you observe that the protection LED is lit, please check the system carefully to determine  
what has caused the protection circuit to engage. The amplifier can be reset by turning  
the remote power off and then on again. If the amplifier shuts down due to a thermal  
overload condition, please allow it to cool down before powering up. If the amplifier shuts  
down because of an input overload or short circuit, be sure to repair these conditions before  
attempting to power up the amplifier again.  
Thermal and Speaker Short Protection Circuitry  
LED Power and Protection Indicators  
2 Ohm Operation (in stereo mode)  
Five Channel Amplifier  
GT1580  
Your GT amplifier was designed to operate effectively at loads as low as 2 Ohms. This  
means that you can install four 8 Ohm speakers per channel when using parallel wiring.  
Increasing the number of woofers per channel at low frequencies (up to 100Hz) produces an  
acoustic coupling effect. This acoustic coupling increases your power output by 3 dB per  
speaker.  
Five Channel Bridgeable MOSFET Amplifier  
Tri-Mode Capable  
Heavy-duty Aluminum Alloy Heatsink  
Class A-B Operation  
Continuously-Variable LowPass Crossover: 45Hz-90Hz  
(all channels)  
Bass Boost Switch: 0 to +18dB (CH1-CH4)  
Variable Bass Boost: 0 to +18dB (CH5)  
Remote Subwoofer Level Control  
Continuously-Variable Input Gain Control  
High Pass Crossover: 200Hz (Channels 1-4)  
Nickel Plated RCA And Speaker Level Inputs  
Remote Turn-On/Turn-Off Circuit  
MOSFET Pulse Width Modulated Power Supply  
2 Ohm Stable Stereo Operation with Output Power Increase  
Soft Turn-On Circuit  
Thermal and Speaker Short Protection Circuitry  
LED Power and Protection Indicators  
When operating at 2 Ohms, the amplifiers will increase their output power by approximately  
50%. The current draw will also increase by about the same amount. So be sure you have  
enough current to run the amplifiers into a 2 Ohm load. If you lack adequate current, your  
music reproduction will be distorted.  
Please note: The gain control of any car audio amplifier should not be mistaken for a volume  
control. It is a sophisticated device, designed to match the output level of your audio source unit  
to the input level of the amplifier. Do not adjust this input level to maximum unless your input  
level requires it. Ignoring these instructions will result in an input overload to the amplifier, and  
excessive audio distortion. It can also cause the protection circuit to engage.  
Electrical Wiring  
High Level Inputs  
The GT 4-Channel amplifiers utilize a separate connector  
for Channels 1/2 and Channels 3/4.  
All BOSS GT series power amplifiers are equipped with easy top access screw terminals. These  
terminals are nickel-plated in order to ensure excellent electrical contact and resist corrosion.  
When making electrical connections to the amplifier, please observe the following:  
WARNING: If you use the HIGH LEVEL (speaker) inputs, do not use the LOW LEVEL inputs at the same time.  
Use at least 8 gauge or heavier wire for power and ground connections.  
Wire the amplifier directly to the car battery. Make sure there is circuit protection (such as a fuse)  
on the positive power lead, within 18 inches of the battery.  
For the ground connection, use the shortest possible wire to a good chassis ground point.  
Wire the Remote connection to the remote turn-on lead of your equalizer or head unit. In some cases  
cases this may be the power antenna lead of the head unit.  
Four Channel Amplifiers:  
GT 1180, GT 1380, GT 1480  
Remote Subwoofer Level Control  
All BOSS GT series power amplifiers are equipped with a dashboard mount remote subwoofer  
level control. Run the supplied dashboard remote control from the front panel of your amplifier. By  
turning the level knob clockwise, you will increase the output of low frequencies.  
6
7
CHANNEL 2 (+)  
CHANNEL 2 (-)  
CHASSIS GROUND  
CHANNEL 1 (-)  
CHANNEL 1 (+)  
Fuses  
HEAD UNIT  
Fuses protect both the amplifier and the electrical system of your vehicle from faulty conditions. If  
you must replace the fuse in your GT amplifier, use a fuse of exactly the same type and rating.  
A different type or rating may result in damage or cause a fire.  
CHANNEL 3 (+)  
CHANNEL 3 (-)  
From  
Mounting the Amplifier  
HEAD UNIT  
SPEAKER  
OUTPUTS  
CHASSIS GROUND  
Mark the location for the mounting screw holes by positioning the amplifier where you wish to  
install it and use a scribe (or one of the mounting screws) inserted in each mounting hole to mark  
the mounting surface. If the mounting surface is carpeted, measure the hole centers and mark with  
a felt tip pen.  
CHANNEL 4 (-)  
CHANNEL 4 (+)  
Drill pilot holes in the mounting surface for the mounting screws and insert the mounting screws  
into these holes. Tighten them securely.  
Note: Before beginning your installation, be sure to take note of any wires, lines or other devices  
in your vehicle which may be located behind any mounting surface.  
Four Channel Amplifiers:  
GT1180, GT1380, GT1480  
High Level Inputs (5 Channel Amplifier) - GT 1580  
WARNING: If you use the HIGH LEVEL (speaker) inputs, do not use the LOW LEVEL inputs at the  
same time.  
CHANNEL 2 (+)  
CHANNEL 2 (-)  
CHASSIS GROUND  
CHANNEL 1 (-)  
CHANNEL 1 (+)  
CH1  
INPUT  
CH2  
INPUT  
CH4  
INPUT  
CH3  
INPUT  
HEAD UNIT  
CH1/2  
CH5  
CH5-L  
CH1  
CH3  
CH1  
CH2  
From  
From OUTPUT  
of HEAD UNIT  
From OUTPUT  
of HEAD UNIT  
45  
90  
HEAD UNIT  
SPEAKER  
OUTPUTS  
45  
90  
45  
90  
CH4 CH5  
IN IN  
CH3  
CH4  
CH2  
CH3/4  
CH4  
CH5-R  
INPUT MODE  
8
9
Five Channel Amplifier:  
G T 1580  
CHANNEL 3 (+)  
CHANNEL 3 (-)  
CHASSIS GROUND  
CHANNEL 4 (-)  
Mode Switch in  
4ch Position  
CHANNEL 4 (+)  
CH1/2  
CH1  
CH5  
CH5-L  
CH3  
CH1  
CH2  
Note: Use the 4CH mode when using high level (speaker) inputs and the 5CH mode use with for low level (RCA) inputs.  
45  
90  
45  
90  
45  
90  
CH4 CH5  
IN IN  
INPUTMODE  
CH3  
CH4  
CH2  
CH3/4  
CH4  
CH5-R  
Mode Switch Settings  
MODE  
CH4 INPUT  
CH3 INPUT  
CH1 INPUT  
CH2 INPUT  
INPUT  
OUTPUT  
From OUTPUT  
of HEAD UNIT  
From OUTPUT  
of HEAD UNIT  
SWITCH  
5CH IN  
4CH IN  
2CH IN  
1CH/2CH/3CH/4CH/5CH  
1CH/2CH/3CH/4CH  
1CH/2CH  
1/2/3/4/5CH  
1/2/3/4/5CH  
1/2/5CH  
CH3 INPUT  
CH1 INPUT  
From OUTPUT  
of HEAD UNIT  
Mode Switch in  
5ch Position  
Y adaptor  
When the high level (speaker) inputs are used, or when  
there is no input for CH5, the Mode switch should be  
placed in the5CH position.  
CH1/2  
CH5  
CH5-L  
CH1  
CH3  
CH1  
CH2  
45  
90  
45  
90  
45  
90  
CH1/2  
CH5  
CH5-L  
CH1  
CH3  
CH4 CH5  
IN IN  
INPUTMODE  
CH3  
CH4  
CH2  
CH3/4  
CH4  
CH5-R  
CH1  
CH2  
45  
90  
45  
90  
45  
90  
CH4 CH5  
IN IN  
INNPPUTTMMOODDEE  
Y adaptor  
CH3  
CH4  
CH2  
CH3/4  
CH4  
CH5-R  
CH2 INPUT  
CH4 INPUT  
From OUTPUT  
of HEAD UNIT  
Dual Tri-Mode Speaker Wiring  
Four Channel Speaker Wiring  
Four Channel Amplifiers  
GT1180, GT 1380, GT1480  
Tri-Mode Operational Output is a unique feature which allows a subwoofer to be operated in MONO  
mode, while the main speakers are playing STEREO simultaneously on one pair of amplifier output  
channels.  
CH1  
SPEAKER  
CH2  
SPEAKER  
To engage the amplifier in this mode, place the Crossover (Subwoofer) switch in the FULL position.  
Use a 100V non-poplar capacitor for a high pass crossover and a wire coil inductor to block high  
frequencies from the subwoofer, as shown in the figure below. Please review the table below for  
inductor and capacitor component values to determine the desired crossover frequencies.  
Four Channel Amplifiers  
GT1180, GT 1380, GT1480  
SUBWOOFER MINIMUM  
SUBWOOFER  
IMPEDANCE 8 OHMS!  
CH 2  
SPEAKER  
CH 1  
SPEAKER  
+
GROUND  
10  
11  
CH3  
SPEAKER  
CH4  
SPEAKER  
+
LOW PASS FILTER  
(INDUCTOR)  
+
SPEAKER  
IMPEDANCE  
4 - 8 OHMS!  
To REMOTE TURN-ON  
from HEAD UNIT  
To BATTERY  
HIGH PASS FILTERS  
(CAPACITORS)  
Bridged Speaker Wiring  
LEFT SPEAKER  
(SUBWOOFER)  
SPEAKER IMPEDANCE  
4 - 8 OHMS!  
Four Channel Amplifiers  
GT1180, GT 1380, GT1480  
+
GROUND  
HIGH PASS FILTERS  
(CAPACITORS)  
To REMOTE TURN-ON  
from HEAD UNIT  
+
+
SPEAKER IMPEDANCE  
4 - 8 OHMS!  
To BATTERY  
CH3  
SPEAKER  
CH 4  
SPEAKER  
GROUND  
+
LOW PASS FILTER  
(INDUCTOR)  
To REMOTE TURN-ON  
from HEAD UNIT  
SUBWOOFER MINIMUM  
IMPEDANCE 8 OHMS!  
+
SPEAKER IMPEDANCE  
4 - 8 OHMS!  
RIGHT SPEAKER  
(SUBWOOFER)  
SUBWOOFER  
To BATTERY  
CH2  
SPEAKER  
Dual Tri-Mode Speaker Wiring  
Five Channel Speaker Wiring  
Five Channel Amplifier:  
GT1580  
Tri-Mode Operational Output is a unique feature which allows a subwoofer to be operated in MONO  
mode, while the main speakers are playing STEREO simultaneously on one pair of amplifier output  
channels.  
CH 5 SPEAKER  
(SUBWOOFER)  
CH1  
SPEAKER  
To engage the amplifier in this mode, place the Crossover (Subwoofer) switch in the FULL position.  
Use a 100V non-poplar capacitor for a high pass crossover and a wire coil inductor to block high  
frequencies from the subwoofer, as shown in the figure below. Please review the table below for  
inductor and capacitor component values to determine the desired crossover frequencies.  
SUBWOOFER MINIMUM  
IMPEDANCE 8 OHMS!  
Five Channel Amplifiers  
GT1580  
SUBWOOFER  
SPEAKER IMPEDANCE  
4 - 8 OHMS!  
CH4  
SPEAKER  
GROUND  
CH 2  
SPEAKER  
CH 1  
SPEAKER  
+
SPEAKER IMPEDANCE  
4 - 8 OHMS!  
12  
13  
CH3  
SPEAKER  
To REMOTE TURN-ON  
from HEAD UNIT  
+
+
LOW PASS FILTER  
(INDUCTOR)  
To BATTERY  
CH 5 SPEAKER  
(SUBWOOFER)  
HIGH PASS FILTERS  
(CAPACITORS)  
Bridged Speaker Wiring  
SUBWOOFER MINIMUM  
IMPEDANCE 8 OHMS!  
Five Channel Amplifier:  
GT1580  
BRIDGED  
LEFT SPEAKER  
SPEAKER IMPEDANCE  
4 - 8 OHMS!  
CH 5 SPEAKER  
(SUBWOOFER)  
+
GROUND  
HIGH PASS FILTERS  
(CAPACITORS)  
To REMOTE TURN-ON  
from HEAD UNIT  
+
+
To BATTERY  
SPEAKER IMPEDANCE  
4 - 8 OHMS!  
CH 4  
SPEAKER  
CH 3  
SPEAKER  
SPEAKER IMPEDANCE  
4 - 8 OHMS!  
GROUND  
+
To REMOTE TURN-ON  
from HEAD UNIT  
+
LOW PASS FILTER  
(INDUCTOR)  
SUBWOOFER  
SPEAKER IMPEDANCE  
4 - 8 OHMS!  
To BATTERY  
SUBWOOFER MINIMUM  
IMPEDANCE 8 OHMS!  
BRIDGED  
RIGHT SPEAKER  
Precautions  
Troubleshooting  
Before removing your amplifier, refer to the list below and follow the suggested procedures.  
Always test the speakers and their wires first.  
Before you drill or cut any holes, investigate your car's layout very carefully. Take care  
when you work near the gas tank, fuel lines, hydraulic lines and electrical wiring.  
No Output  
Confirm that all terminal strip connections are secure and tight.  
Do not operate the amplifier when it is not mounted. Attach all audio system components  
securely within the automobile to prevent damage, especially in case of an accident.  
Check both in-line and built-in fuses. Both the "+12V" and the "REMOTE" terminals  
must have +12V referenced to chassis ground.  
Do not mount this amplifier so that the wire connections are unprotected or in a pinched  
condition, or likely to be damaged by nearby objects.  
Confirm that the audio signal source (car radio, equalizer, etc.) is connected and  
is supplying output signal. To check if the amplifier is supplying signal, unplug  
the RCA cables from the signal source (but leave them plugged into the amp).  
Gently tap the center pin of each of the disconnected RCA plugs with your finger.  
This should produce a noise (feedback) in your speakers.  
Before making or breaking power connections in your system, disconnect the vehicle  
battery. Confirm that your head unit or other equipment is turned off while connecting  
the input jacks and speaker terminals.  
14  
15  
Only one  
channel  
works  
Confirm that all speaker strip connections are secure and tight.  
If you need to replace the power fuse, replace it only with a fuse identical to that supplied  
with the system. Using a fuse of different type or rating may result in damage to your  
system which isn't covered by the manufacturer's warranty.  
Check the BALANCE control on the head unit (or other source) to verify that it  
is set to its midpoint.  
If you are using the Low Level RCA Inputs, reverse the input plugs at the amplifier  
(switches the R with the L). If the channel which is silent switches to other side,  
the problem is either in the head unit/other source or the connecting tables.  
Readjust the Input Sensitivity Control to better suit the input signal.  
Weak Output  
Noise in the  
Audio  
If the noise is a "whine" whose pitch follows the engine speed, confirm that the  
amplifier and any other signal sources ( head unit, etc.) are properly grounded.  
If the noise is a "clicking" or "popping" noise whose rate follows the engine speed,  
this usually means that the vehicle is equipped with resistor spark plugs and wires,  
or that the ignition is in need of service.  
Check the routing of the speaker and input wires to make sure they are not  
adjacent to wires which interconnect lights and other accessories.  

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