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4) Input Sensitivity Control 

Turn control all the way counterclockwise (minimum position). In this position, the amplifier will be less sen-
sitive to the input signal from the head unit. Slowly rotate this control clockwise until maximum undistorted
playing level is heard from the subwoofer(s). Listen closely for faults such as bottoming from the subwoofer(s).
If fault is detected, rotate Input Sensitivity control counterclockwise until fault is eliminated. At this point,
the maximum undistorted subwoofer playing level has been defined.

5) Lowpass Crossover Control

Move the selector switch to “ON.” In this setting, lowpass signal is sent to the speaker outputs. Experiment
with the crossover point setings while the subwoofer is active. A higher setting will increase the perceived
output, and a lower setting will make the bass response more omnidirectional. Find the balance between
the two that works best for the vehicle.

6) Phase

Subwoofer phase is relative to the front loudspeakers. Correct electrical phase does not always mean 
correct acoustic phase. Swap positive (+) and negative (-) connections at the speaker outputs where the
subwoofer is connected to the amplifier. It is beneficial to listen to the subwoofer connected in both phase 
conditions. The subwoofer should be left in the condition in which the strongest bass response is noted. 

Setup Tuning—Subwoofers (cont.)

2) Head Unit

The head unit should have all controls such as bass, treble, balance, and fader
set to the flat or centered position. The volume control should be at the 
minimum setting. If the head unit has any equalization or bass management
features such as 

boost

, they should be deactivated at this time. Turn head unit

on, and verify that the GREEN status LED is lit on the amplifier.

3) Volume

With the chosen musical track playing, turn the head unit volume control up until the maximum level of 
undistorted signal is heard from the speakers. For most head units, this will be at the end of the volume 
control range.

WARNING!

A distorted signal from the head unit sent to the amplifier can cause loudspeaker failure at 

higher listening levels!

Содержание GT-20

Страница 1: ...GT 20 GT 22 2 Channel High Current High Power Amplifiers...

Страница 2: ...es Wiring 10 Amplifier fuses 10 Wire gauge 10 Installation fuses wiring cont 11 Power B power ground GND connection 11 Remote input connection 11 Speaker output connection 11 Installation fuses wiring...

Страница 3: ...ency Response 3dB 10Hz 95kHz 10Hz 95kHz Signal to Noise Ratio A Weighted 100dB 100dB Dimensions HxWxD 21 4x77 8x87 8 57x200x225mm 21 4x121 8x87 8 57x308x225mm GT 20 GT 22 Features 2 Channel High Curre...

Страница 4: ...ft position the L R inputs go to the L R channels of the amplifier In the right position the input is for mono operation Input Sensitivity Control Turn control clockwise to increase the amplifier sens...

Страница 5: ...he highpass crossover is engaged and is cen tered on the selected crossover point The range of operation is 0 7 1 2 Status LED Indicators GREEN indicates the normal operating condition the amplifier i...

Страница 6: ...ulti position Mounting Feet The mounting feet are designed to slide in both directions to clear installation obstructions on the mounting surface WARNING Before driving the mounting screws through any...

Страница 7: ...used together without additional hardware Wire Connection Amplifier accepts stripped wire directly into the terminal blocks Speaker outputs accept 8 gauge and the DC power and ground accept 4 gauge Ti...

Страница 8: ...n correctly the electrical system of the vehicle should be professional ly checked for overall electrical capacity When used the amplifier will increase the demand on the battery and alternator Theref...

Страница 9: ...ble Never mount an amplifier in the engine compartment of a vehicle WARNING Before driving the mounting screws through any surface be sure of what is behind that sur face Check for gas tank brake line...

Страница 10: ...wedging into position Amplifier should be mounted using the movable mounting feet and the provided mounting screws Installation Fuses Wiring Installation Amplifier Mounting cont Amplifier Fuses Altho...

Страница 11: ...se the supplied FEMALE quick connector to connect the REMOTE trig ger lead from the head unit to the amplifier Crimp connector to wire from head unit that controls remote turn on refer to head unit ow...

Страница 12: ...and should be used 2 Input Sensitivity Control Turn control all the way counterclockwise minimum position In this position the amplifier will be less sensitive to the input signal from the head unit S...

Страница 13: ...350Hz Rotate Q Control fully coun terclockwise Move crossover switch to the right ON position Slowly rotate the Input Sensitivity control clockwise until maximum undistorted playing level is heard fro...

Страница 14: ...ing be left in the 0 7 position and adjusted only after the input sensitivity and highpass crossover ranges are known Small adjustments to the Q setting are all that are required to fine tune the syst...

Страница 15: ...ative to the front loudspeakers Correct electrical phase does not always mean correct acoustic phase Swap positive and negative connections at the speaker outputs where the subwoofer is connected to t...

Страница 16: ...16 System Examples System A Full range Front Speakers fuse to battery terminal to ground 6 5LF 6 5LF System B Rear Fill Speakers fuse to battery terminal to ground 6 5LF 6 5LF...

Страница 17: ...17 System Examples cont System C Single Subwoofer 2 System D Parallel 4 Subwoofers 2 load fuse to battery terminal to ground 10 5LF 2 fuse to battery terminal to ground 10 5LF 4 10 5LF 4...

Страница 18: ...eck equipment and cables leading to amplifier Verify RCA cables are of good quality with no breakage to internal shields RCA cables from source to amplifier are not run alongside power Amplifier Outpu...

Страница 19: ...ties are to use the system according to the instructions supplied to provide safe and secure transportation to an authorized Boston Acoustics service representative and to present proof of purchase in...

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