Boston Acoustics Stereo Amplifier GT 28, GT 24 User Manual

GT-28  
GT-24  
2-Channel, High-Current/High-Power Amplifiers  
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Parts List  
Included Hardware: GT-28 & GT-24  
(1) owners manual  
(1) female quick-connect terminal for remote input  
(1) 2mm hex wrench (for speaker input)  
(1) 3mm hex wrench (for power input)  
(6) mounting screws  
Features and Specifications  
GT-28 and GT-24 Features  
2-Channel, High-Current Amplifier  
Continuously Variable Crossover and Q-factor Settings  
2Mono Operation  
Selectable Highpass, Lowpass, and Bandpass Settings  
Bandpass Configurable for Midbass or Subwoofer  
Terminals Accept Bare, Heavy-Gauge Wire  
Power Increase with Input Voltage Rise  
Advanced Cooling Allows Varied Mounting Positions  
Adjustable Feet for Varied Mounting Surfaces  
24dB or 12dB Octave Lowpass Setting  
Screw-Down Security Cover Protects Tuning Controls  
Optional Remote Subwoofer Level Control  
Technical Specifications  
GT-28  
GT-24  
14.4VDC Power  
@ 4 Ohms  
2x250W  
2x450W  
1x900W  
1x1350W  
2x175W  
2x275W  
1x550W  
1x900W  
@ 2 Ohms  
@ 4 Ohms (mono)  
@ 2 Ohms (mono)  
12.6VDC Power  
@ 4 Ohms  
2x200W  
2x350W  
1x700W  
1x1100W  
2x120W  
2x200W  
1x440W  
1x750W  
@ 2 Ohms  
@ 4 Ohms (mono)  
@ 2 Ohms (mono)  
Frequency Response (-3dB)  
Signal-to-Noise Ratio (A Weighted)  
Dimensions (HxWxD)  
10Hz–95kHz  
>100dB  
21/4x215/8x87/8” (57x548x225mm)  
10Hz–95kHz  
>100dB  
21/4x18x87/8” (57x458x225mm)  
3
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Control Functions  
3
9
7
6
5
OFF  
200  
ON  
OFF  
185  
ON  
STEREO  
MONO  
L
OFF  
ON  
FUSE  
4
x
25A  
LOWPASS SLOPE  
12dB 12dB 24dB  
LOWPASS  
HIGHPASS  
INPUT  
SUBWOOFER LEVEL  
350  
350  
ST  
MONO  
Hz  
50  
Hz  
20  
MONO  
B+  
B+  
GND  
GND  
0.2  
5
1.2  
L
R
INPUT SENSITIVITY 2.6  
0.95  
Q/HP  
0.7  
I
N
PUT  
REMOTE  
SUBWOOFER LEVEL  
SPEAKER OUTPUT  
12.6–14.4VDC  
GROUND  
4
8
GT-28 Top Panel Shown  
1
STATUS  
12.6–14.4VDC  
GROUND  
MONO  
B+  
B+  
GND  
GND  
L
R
9
ON  
10  
SAFE  
2
GT-28 Front Panel Shown  
1
RCA Inputs  
1
RCA cables from head unit or from other line level device should be connected  
here. Use both inputs (L and R) for stereo; use “L” input for mono.  
2
2
Remote Input  
Use the supplied FEMALE quick-connector to connect the REMOTE trigger lead  
from the head unit to the amplifier. Amplifier turns “ON” when head unit is turned  
“ON.” One FEMALE .210" connector is supplied with amplifier.  
STEREO  
MONO  
3
Input Switch  
INPUT  
L
In the left position, the L and R inputs go to the L and R channels of the amplifi-  
er. In the right position, the input is for mono operation.  
4
Input Sensitivity Control  
0.2  
5
Turn control clockwise to increase the amplifier sensitivity to incoming signals. Turn  
control counterclockwise to decrease the amplifier sensitivity.  
INPUT SENSITIVITY 2.6  
5
Highpass Crossover Controls  
To use 12dB/octave crossover, move HIGHPASS switch to right-hand position.  
Highpass crossover frequency is adjustable from 20Hz to 350Hz by rotary control.  
(Moving switch to left-hand position will bypass crossover functions.)  
OFF  
ON  
HIGHPASS  
350  
Hz  
20  
185  
4
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Control Functions (cont.)  
OFF  
200  
ON  
6
Lowpass Crossover Controls  
LOWPASS  
350  
To use lowpass crossover move LOWPASS switch to righthand position. Lowpass  
crossover frequency is adjustable from 50Hz to 350Hz by rotary control. (Moving  
switch to left-hand position will bypass crossover functions.)  
Hz  
50  
7
Lowpass Slope  
Select appropriate crossover slope of 12 or 24dB/octave by moving LOWPASS  
SLOPE switch.  
LOWPASS SLOPE  
12dB 12dB 24dB  
ST  
MONO  
8
“Q” Control  
The “Q” Control is active when the highpass crossover is engaged and is cen-  
tered on the selected crossover point. The range of operation is 0.7–1.2.  
dB  
Q
+1.6dB  
0dB  
-3dB  
.707 .95 1.2  
t(tuned crossover frequency)  
9
Subwoofer Level Control Port  
SUBWOOFER LEVEL switch should be set to “OFF” when control circuit is not  
installed, (see optional Subwoofer Level Control owners manual).  
10  
Status LED Indicators  
GREEN indicates the normal operating condition; the amplifier is “ON.” GREEN  
and RED together are normal when the amplifier is first turned “ON”; RED will  
turn off after a few seconds. When both GREEN and RED remain on, the ampli-  
fier is in thermal shutdown condition. RED only indicates a fault condition, “SAFE.”  
5
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Mechanical Functions  
Recessed RCA Inputs  
The input jacks are recessed into the body of the amplifier to provide clear-  
ance in tight mounting locations.  
1 inch  
1 inch  
Control Cover Removal and Reinstallation  
The cover panel is secured with two (2) captive coin-slotted screws. Coin-slot-  
ted screws allow a coin edge to be used as a screwdriver to remove the panel.  
Multi-Position Mounting Feet  
The mounting feet are designed to slide in both directions to clear installa-  
tion obstructions on the mounting surface.  
WARNING! Before driving the mounting screws through any surface, be sure  
of what is behind that surface. Check for the gas tank, brake lines, and any vehi-  
cle wiring harness.  
Vents (Side and Rear)  
The cooling vents must be kept clear of obstructions once the amplifier is  
installed. Failure to do this could lead to premature thermal shutdown or ampli-  
fier failure.  
upper side vent  
lower side vent  
6
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Mechanical Functions (cont.)  
Amplifier Linking  
The design of the side panels enables multiple amplifiers to be 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. Tighten with supplied hex wrenches.  
Fuses  
Amplifier accepts standard AT-style automotive blade fuses.  
FUSE  
4
x
25A  
FUSE  
3
x
20A  
GT-28  
GT-24  
7
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General Installation Precautions  
WARNING! Before driving the amplifier mounting screws through any surface, be sure of what is behind  
that surface. Check for the gas tank, brake lines, and any vehicle wiring harness. Never run wires outside  
or under the vehicle or where they could become broken or interfere with the safe operation of the  
vehicle.  
Before You Install  
Before you install the unit, disconnect the negative (–) battery cable in the engine compartment of the vehi-  
cle. Doing so will prevent damage to both the electrical system of the vehicle and the amplifier during  
installation.  
Battery and Charging System  
In order for the amplifier to function 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. Therefore, both should be thoroughly evaluated before installing the amplifier to ensure they  
are in normal operating condition and able to handle the increased demand the amplifier will present to  
the vehicles electrical system.  
Wire Routing  
Do not run the power wire near any low-level signals or audio cables such as the RCAs from the head  
unit. (Noise can be introduced into the amplifier when this occurs.) It is helpful to diagram the wire layout  
first before any installation is attempted.  
8
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Installation—Amplifier Mounting  
Choose the Mounting Location  
Plan your installation so that the amplifier is mounted where adequate ventilation is available.  
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 lines, and any vehicle wiring harness.  
13mm (1/2")  
225mm (87/8")  
GT-28 (GT-24 depth dimensions are the same)  
57mm (21/2")  
57mm (21/2")  
458mm (18")  
548mm (215/8")  
9
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Installation—Amplifier Mounting (cont.)  
Passenger and Trunk Compartment Mounting  
If the amplifier is mounted under a seat, be sure that the vents do not become  
blocked. Do not allow seat padding or other obstructive material to press  
down on the amplifier.  
All Boston GT amplifiers have top panel controls. If the amplifier is mounted  
under a seat, position the amplifier so the cover panel can be removed with  
the seat forward or back to allow adjustment of the audio settings.  
When mounting in a trunk, choose a location that will be protected from slid-  
ing cargo or other materials. Mount the amplifier to solid surfaces only. Do not  
mount to plastic trim panels. Do not mount the amplifier with Velcro, double-  
stick tape, or by wedging into position. Amplifier should be mounted using  
the movable mounting feet and the provided mounting screws.  
Installation—Fuses and Wiring  
Amplifier Fuses  
FUSE  
4
x
25A  
Although the amplifier has internal fuses, additional fusing should be provided  
at the battery on the positive (+) power wire going to the amplifier. An inline  
fuse should be installed at no more than 18" (46cm) on the positive (+) power  
wire. The rating of the inline fuse should equal the value of the internal fuses  
of the amplifier if only the amplifier is connected to this wire. If other devices  
are connected to this wire, the fuse value should be of sufficient capacity to  
handle the demand.  
GT-28  
FUSE  
3
x
20A  
GT-24  
Wire Gauge  
The amplifier accepts up to 4-gauge stripped wire at the DC power and ground input terminals, and 4-gauge  
is recommended. Wire runs should be kept to the minimum practical length.  
10  
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Installation—Fuses and Wiring (cont.)  
Power/B+ and Power/GND Connection  
Strip approximately 5/8" (16mm) of insulation. The positive (+) power wire  
is installed into the amplifier terminal marked “B+”. The negative (–) wire  
is installed into the terminal marked “GND”. The ground wire should be  
as short as possible and connected directly to the chassis of the vehicle.  
Make sure that the chassis connection point is free of rust, grease, dirt,  
paint, and other materials that may insulate the ground wire from making  
proper connection. Tighten the B+ and GND terminals with the supplied  
3mm hex wrench to secure the wire into the terminals. If the power wire  
must be routed through a drilled or existing hole, use a nylon panel grom-  
met to prevent fraying the wire insulation. Failure to do so could lead to  
an electrical short if the wire insulation is worn through and the power wire  
is shorted to ground.  
Strip 5/8" (16mm)  
Remote Input Connection  
Use 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 owners manu-  
al). Once the quick-connector is crimped into place, carefully push con-  
nector onto recessed MALE REMOTE terminal adjacent to the RCA input  
pair. Only one (1) remote turn-on terminal should be connected.  
Speaker Output Connection  
Prepare each wire by stripping approximately 5/8" (16mm) of insulation. The positive (+) speaker wires are  
installed into the amplifier terminals marked “SPEAKER OUTPUT” / “+”. The negative (–) speaker wires are  
installed into the amplifier terminals marked “SPEAKER OUTPUT” / “-”. Tighten the “SPEAKER OUTPUT”,  
“+”, and “-” terminals with the supplied 2mm hex wrench to secure the wires into the terminals. If the speak-  
er wires must be routed through a drilled or existing hole, use a nylon panel grommet to prevent fraying  
the wire insulation. Failure to do so could lead to an electrical short if the wire insulation is worn through  
and the speaker wires are shorted to ground.  
MONO  
L
R
SPEAKER OUTPUT  
11  
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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  
0.2  
Turn control all the way counterclockwise (minimum position). In this position,  
INPUT SENSITIVITY 2.6  
the amplifier will be less sensitive to the input signal from the head unit.  
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  
185  
ON  
OFF  
200  
ON  
HIGHPASS  
350  
LOWPASS  
350  
LOWPASS SLOPE  
12dB 12dB 24dB  
Hz  
20  
Hz  
50  
ST  
MONO  
Lowpass Slope Control  
Highpass Crossover Control  
Lowpass Crossover Control  
12  
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Setup Tuning—Full-Range Speakers (cont.)  
4) 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 defeated at this time. Turn head unit on, and verify  
that the GREEN status LED is lit on the amplifier.  
5) 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 near the end of the volume  
control range.)  
WARNING! A distorted signal from the head unit sent to the amplifier can cause loudspeaker failure at high-  
er listening levels!  
6) Input Sensitivity Control  
0.2  
Slowly rotate control clockwise until maximum undistorted playing level is  
INPUT SENSITIVITY 2.6  
heard from the speakers. Listen closely for bottoming from the speakers. If  
detected, rotate INPUT SENSITIVITY control counterclockwise until it is elim-  
5
inated.  
7) Crossover Controls  
To achieve higher undistorted playing levels from the main speakers, the  
highpass crossover must be engaged. Rotate crossover control fully clock-  
wise. The highpass crossover point is now set at 350Hz. Rotate “Q” Control  
OFF  
185  
ON  
fully counterclockwise. Move crossover switch to the right (ON) position.  
HIGHPASS  
350  
Slowly rotate the INPUT SENSITIVITY control clockwise until maximum undis-  
torted playing level is heard from the speakers. Listen closely for bottoming  
from the speakers. If detected, rotate the input sensitivity control counter-  
clockwise until it is eliminated. Slowly rotate the highpass crossover control  
counterclockwise while listening for bottoming. You are lowering the  
crossover point, which means that more bass signal is being sent to the  
speakers. If bottoming is detected, rotate the INPUT SENSITIVITY control  
counterclockwise until it is eliminated and/or rotate the HIGHPASS crossover  
control clockwise to raise the crossover point.  
Hz  
20  
13  
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Setup Tuning—Full-Range Speakers (cont.)  
8) “Q” Control  
Once the highpass crossover point has been determined, use the “Q” con-  
trol to increase the bass information centered around the crossover point.  
Setting the “Q” control is done in conjunction with setting the levels on the  
input sensitivity and highpass crossover frequency controls. You may find while  
setting the “Q” that bottoming may be detected in the front speakers; low-  
ering the “Q” input sensitivity or raising the highpass crossover point will elim-  
inate this. Minor adjustments to each setting are required to fine-tune the sys-  
tem.  
Setting the “Q” is a subtle process. It is recommended that the “Q” setting 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 system.  
Setup Tuning—Rear Fill Speakers  
You may set the channels for summed mono operation from the L and R RCA inputs by setting the  
INPUT switch to the right-hand, MONO, position and then connecting the L and R REAR loudspeakers  
normally as you would for regular stereo operation. This configuration is beneficial for rear fill in some  
applications.  
Setup Tuning—Subwoofers  
1) Input Switch  
Move switch to the right-hand (MONO) position; the inputs are summed to mono. Connect the subwoofer  
to the SPEAKER OUTPUT terminals marked for MONO operation. NOTE: Subwoofer impedance is 2 ohms  
minimum.  
14  
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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!  
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  
LOWPASS SLOPE  
a lower setting will make the bass response more omnidirectional. 12 or 24dB  
crossover slopes are available. Depending on your installation and listening  
preferences, one will work more effectively.  
12dB 12dB 24dB  
ST  
MONO  
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.  
15  
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System Examples  
System A—Full-Range Front Speakers  
to ground  
to ground  
fuse  
to + battery terminal  
to + battery terminal  
fuse  
System B—Rear Fill Speakers  
to ground  
to ground  
fuse  
to + battery terminal  
to + battery terminal  
fuse  
16  
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System Examples (cont.)  
System C—Parallel 4Subwoofers (2load)  
to ground  
to ground  
fuse  
to + battery terminal  
to + battery terminal  
fuse  
4  
10.5LF  
4Ω  
10.5LF  
System D —Series/Parallel 2Subwoofers (2load)  
mono  
to ground  
to ground  
fuse  
to + battery terminal  
fuse  
to + battery terminal  
2  
10.5LF  
2Ω  
10.5LF  
2Ω  
10.5LF  
2Ω  
10.5LF  
17  
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Amplifier Troubleshooting Guide  
Status LEDs on Amplifier not LitHead Unit (Source) Turned “ON”  
Verify  
Remote turn-on wire from source to amplifier has proper voltage  
Power (B+) connections at amplifier, terminal blocks, and battery are secure  
Ground (GND) connections at amplifier and vehicle chassis are secure  
Battery B+ fuse is OK  
Amplifier fuse is OK  
B+ at battery and B+ at amplifier have proper voltage  
Status LEDs Lit, no Output from SpeakersSpeakers in Normal Operating  
Condition  
Verify  
High-level cables from speaker(s) to amplifier are securely connected  
RCA cables from amplifier to source are securely connected  
Sensitivity adjustment on amplifier is correctly adjusted  
Engine Noise from Speaker(s)  
Turn source “OFF”  
Disconnect RCA cables at amplifier  
If noise stops, check 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 Output DistortedMusic not Recorded with Intentional Distortion  
Verify  
Source output to amplifier is not distorted  
Amplifier input sensitivity is correctly adjusted  
Amplifier Shutting Down, Red and Green LEDs LitAmplifier in Thermal  
Protection Mode  
Verify  
Amplifier is mounted with adequate air circulation around vents  
Amplifier does not have obstructions blocking back or side panel vents  
Amplifier is not mounted under carpet  
Speakers meet correct impedance for application (mono or stereo hookup)  
Amplifier not Turning “ON”, Red LED LitAmplifier not Connected to a Shorted  
Speaker  
Verify  
Speaker crossover is not defective  
High-level cables from speaker to amplifier are not shorted  
Amplifier not Turning “ON”, Red LED LitSpeakers, Crossovers, and Cable OK  
Amplifier requires service  
18  
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Contact and Warranty Information  
Limited Warranty (US)  
For one (1) year from the date of purchase, Boston Acoustics will repair for the original owner any defect in materials  
or workmanship that occurs in normal use, without charge for parts and labor—when purchased from an authorized  
Boston Acoustics retailer.  
If an authorized Boston Acoustics retailer installs your amplifier, the warranty will be extended one (1) additional year.  
Installation of the amplifier must be noted on the original purchase receipt. The receipt must be presented at the time  
a warranty claim is made.  
Your responsibilities 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 the form  
of your sales slip when requesting service.  
Excluded from this warranty is damage that results from abuse, misuse, accidents, shipping, or repairs or modifications  
by anyone other than an authorized Boston Acoustics service representative.  
This warranty is void if the serial number has been removed or defaced.  
This warranty gives you specific legal rights, and you may also have other rights that vary from state to state.  
If Service Seems Necessary  
First, contact the dealer from whom you purchased the amplifier. If that is not possible, write to:  
Boston Acoustics, Inc., 300 Jubilee Drive, Peabody, MA 01960 U.S.A.,  
or your authorized Boston Acoustics distributor  
We will promptly advise you of what action to take. If it is necessary to return your unit to the factory, please ship it pre-  
paid. After it has been repaired, we will return it freight prepaid in the U.S.A. and Canada.  
Boston, Boston Acoustics, and the Boston logo are  
registered trademarks of Boston Acoustics, Inc.  
© 2003 Boston Acoustics, Inc. All rights reserved.  
Specifications subject to change without notice.  
P/N 042-1801-0  
300 Jubilee Drive  
Peabody, MA 01960 U.S.A.  
(978) 538-5000  
19  
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