Input and Output Notes
Dual Mode Capable: The Boston Acoustics
GT-50 offers excellent vocal sound quality with low distortion on front-end
components, and at the same time provide high current performance for
subwoofers. The amplifier is capable of handling very low impedances, allowing
1-ohm stereo or 2-ohm mono operation.
Low-Profile Design: The compact and
low-profile design allows for installations in tight locations where other
amplifiers will not fit. The GT-50 carries the same design as other GT-series
amplifiers, which allows you to mount multiple GT-series amps side by side for a
clean, professional look.
DPS (Dynamic Power System): This
technology ensures high efficiency at the output stages, increased power with
lower impedance and maximum dynamics and instantaneous response.
Forced Air Cooling: This advanced cooling
system allows you to mount the amplifier in various positions. You can even
mount the amplifier upside down. This design also offers reduced weight and
increased cooling efficiency over traditional heat sinks. The amplifier is
equipped with side and rear vents.
Note: The cooling vents must be kept
clear of obstructions once the amp is installed. Failure to leave the vents unobstructed can lead
to premature thermal shutdown or amplifier failure.
MOSFET Output Stages: The amplifier uses
highly efficient MOSFET output stages for quick recovery under heavy transient
Q-Tune: This technology combines
sophisticated crossover adjustments with Q-Control settings to seamlessly
transition rear bass to the front sound stage.
Multi-Position Mounting Feet: The amplifier has six track-mounted mounting
feet which are designed to slide in both directions to clear installation obstructions
on the mounting surface.
Status LED Indicators: The LED indicators
on the amplifier lets you know when you amp is on or when it is malfunctioning.
- Green Indicates normal operating conditions.
- The Green and Red Indicator light will come
on when the amplifier is first turned on. The red will turn off after a few
- When both Red and Green remain on, the
amplifier is in thermal shutdown mode.
- When only the Red LED is on, it indicates a
Removable Control Cover: The GT-50
amplifier features a removable aluminum control cover that conceals all controls of the
amp. The cover provides a cleaner look, and it prevents accidental adjustment of the settings once they are set.
The cover is held in place by two screws, which can be loosened or tightened
with a coin.
Input Sensitivity Controls:
The amplifier features independent sensitivity control for the front, rear, and
This control is used to match the incoming signal from your CD receiver and/or
separate processor to the
amplifier to give you the best overall sound quality. The Sensitivity range for
each set of inputs is 0.2Volts (200mV) to 5 Volts.
Front and Rear High-pass Crossover Controls:
The amp offers independent high-pass crossover controls for the front and
rear speakers to allow you to filter out frequencies between 20Hz to 350Hz. Keeping certain bass frequencies from
the full-range speakers will prevent
distortion. You can independently turn the High-pass filters off for full range use.
Front and Rear Q Control: The "Q" Controls are active when
the high-pass crossovers are engaged and are centered on the selected crossover
point. The range of operation is 0.7 to 1.2. This control increases the
bass information centered around the high-pass crossover point.
Rear Input Switch: You can choose to connect one or two pairs of RCA
inputs for the front and rear channels. In the Stereo L-R position, the left and
right inputs go to the rear L & R channels of the amplifier. In the Front L-R
position, the inputs for the rear channels are derived from the Front channels
and sent to the Rear L & R channels of the amplifier.
Subwoofer Low-pass Crossover Controls: The low-pass
crossover control allow you to filter out frequencies above the crossover point
so that only the desired bass frequencies reach your subwoofers. The frequency
control is variable between 50Hz and 350Hz. The Low-pass Slope switch lets you
choose a gentle slope of 12dB per octave, a sharper slope of 24dB per octave, or
Subwoofer Level: The amplifier can be used
with the optional GT-RSL wired subwoofer level controller (sold separately). The
wire controller uses voltage control amplification to adjust subwoofer level,
eliminating noise and phase error issues. The Subwoofer Level switched should be
turned set to "Off" when not in use and set to "On" when in use. The connection
for the GT-RSL controller is found on the front of the amplifier behind a
removable plastic panel held in place by two small Phillips-head screws.
Subwoofer Mode Switch: If you have connected a third pair of RCAs, the
Subwoofer Mode Switch should be placed in the Mono L-R position. If you use a
single RCA to the sub input, the Switch should go in the L-Mono position. If you
have no dedicated subwoofer RCAs, the Switch goes in the Non-Fading Mono
position, and the subwoofer signal is derived from the front and rear channels.
Power Output: The GT-50 offers power specifications measured at input
voltages of both 14.4VDC and 12.6VDC:
- 14.4 Volts DC:
- Multi-Channel Power @ 4 ohms: 4 x 55W, 1 x 250W
- Multi-Channel Power @ 2 ohms: 4 x 85W, 1 x 350W
- Mixed Operation Power @ 4 ohms, 2 ohms: 4 x 55W, 1 x 400W
- 12.6 Volts DC:
- Multi-Channel Power @ 4 ohms: 4 x 45W, 1 x 190W
- Multi-Channel Power @ 2 ohms: 4 x 65W, 1 x 250W
- Mixed Operation Power @ 4 ohms, 2 ohms: 4 x 45W, 1 x 300W
and Output Notes
Connections: All input and output
connections are located on the front of the amplifier to make installation and
wire management easier.
RCA Inputs: The amp includes three sets of
recessed RCA inputs to connect from the RCA outputs of your head unit or processor. The recessed
design provides added clearance in tight mounting locations.
Remote Inputs: The supplied female
quick-connector can be used to connect the remote turn-on lead (not supplied) from the head unit to the
amplifier. This lead turns the amplifier "On" when head unit is turned "On".
The amplifier has separate remote turn-on inputs for the front, rear, and
subwoofer channels. These remote leads are wired in parallel inside the amplifier so only one needs to be
Power Connections: The amplifier accepts
stripped bare wire into the dual power and ground terminals. All power and
ground terminals can accept up to a 4-gauge wire. The set screws can be tightened with the supplied
2.5mm hex key.
Speaker Connections: The amplifier accepts
stripped bare wire into the speaker terminal blocks. The speaker outputs accept
up to an 8-gauge wire. The set screws can be tightened with the
supplied 2mm hex wrench. In addition to the four front and rear speaker outputs,
the amplifier offers dual subwoofer outputs. The subwoofer terminals are
internally wired in parallel, allowing you to connect two 4-ohm subwoofers.
Subwoofer Level: Proprietary 9-pin
connection for optional GT-RSL wired remote controller found behind plastic
panel held in place by two Phillips-head screws.
Fuses: The amplifier accepts standard
AT-style automotive blade fuses. It comes equipped with three 30A blade