Boston Acoustics GT-28, GT-24 Setup Tuning-Full-range Speakers, Mono Subwoofer Operation, Music

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Installation—Fuses and Wiring (cont.)

Mono Subwoofer Operation

When the amplifier is configured for mono operation, use the speaker output terminals marked for mono use.

WARNING! Subwoofer impedance must not fall below 2 ohms when in MONO mode.

2-ohm minimum

 

MONO

L

R

SPEAKER OUTPUT

Setup Tuning—Full-range Speakers

1) Music

The material chosen for head unit/amplifier system setup must be both clear in recording quality and dynam- ic in amplitude. Many audiophile “test” discs have musical tracks with both of these characteristics and should be used.

2) Input Sensitivity Control

 

 

Turn control all the way counterclockwise (minimum position). In this position,

 

0.2

the amplifier will be less sensitive to the input signal from the head unit.

INPUT SENSITIVITY

2.6

 

 

5

3) Highpass & Lowpass Crossover Controls

Crossovers should be turned “OFF” during this phase of setup. Move the HIGHPASS and LOWPASS switches to the “OFF” position—with these settings, full-range signal is sent to the speaker outputs. If bot- toming is detected from speakers, move HIGHPASS switch to “ON” and slowly rotate clockwise until bot- toming is eliminated.

OFF

 

 

 

 

 

 

ON

OFF

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

HIGHPASS

 

 

 

 

 

 

 

 

 

 

 

 

LOWPASS

ON

 

350

 

350

LOWPASS SLOPE

 

 

 

 

185

Hz

200

Hz

12dB￿12dB 24dB

ST

MONO

 

 

 

 

 

20

 

50

 

 

Highpass Crossover Control

Lowpass Crossover Control

Lowpass Slope Control

12

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Contents Channel, High-Current/High-Power Amplifiers GT-28 GT-24Table of Contents Parts List Features and SpecificationsControl Functions Subwoofer Level Control Port Status LED Indicators Lowpass Crossover ControlsLowpass Slope ControlMechanical Functions Wire Connection Amplifier LinkingFuses General Installation Precautions Before You InstallBattery and Charging System Wire RoutingInstallation-Amplifier Mounting Choose the Mounting LocationInstallation-Fuses and Wiring Wire GaugePassenger and Trunk Compartment Mounting Amplifier FusesPower/B+ and Power/GND Connection Remote Input ConnectionSpeaker Output Connection Setup Tuning-Full-range Speakers Mono Subwoofer OperationMusic Highpass & Lowpass Crossover ControlsVolume Head UnitCrossover Controls Setup Tuning-Rear Fill Speakers Setup Tuning-SubwoofersPhase Lowpass Crossover ControlSystem Examples System A-Full-Range Front SpeakersSystem B-Rear Fill Speakers System C-Parallel 4Ω Subwoofers 2Ω load System D -Series/Parallel 2Ω Subwoofers 2Ω loadAmplifier Troubleshooting Guide Status LEDs on Amplifier not Lit-Head Unit Source Turned onEngine Noise from Speakers Contact and Warranty Information Limited Warranty USIf Service Seems Necessary