Bazooka MGA4150 User Manual
Dear customer,
Congratulations on your purchase of a Bazooka high-performance amplifier. At Bazooka,
we are fanatics about accurate music reproduction. Your selection of our products for
your sound system indicates that quality sound is also important to you too. At SAS, we
take great pride in manufacturing revolutionary audio products, and through the years of
engineering expertise, hand craftsmanship and critical testing procedures, we have
ENGLISH
created this high-performance series of amplifiers. We hope that you will take as much
pride in owning and using one of these high-quality audio products as we do designing and
manufacturing them.
When properly installed and operated, your Bazooka MGA amplifier will give you years of
clean uninterrupted sound reproduction. Therefore, we urge you to take a few minutes to
carefully read through this manual. It will explain all of the features of your amplifier and
help insure trouble free installation.
Sound can be deceiving. Over time your hearing comfort level adapts to higher volumes of
sound. What may have sounded normal can actually be too loud and harmful to your hearing.
Guard against this by setting your equipment at a safe level before your hearing adapts.
To establish a “safe level”,
Start with your volume control at a low setting.
Slowly increase the volume control until you can hear comfortably, clearly and
without distortion.
Once you have established a comfortable “sound level”, make a note of this
position and do not go above this setting
Taking a minute to do this will help prevent your hearing from being damaged and allow you
to enjoy listening to music throughout your lifetime.
1
SAFETY PRECAUTIONS
Fuse amplifiers power wire at the battery.
Be sure to fuse the power wire within 6” of the car's battery. This will protect the car's
battery in case of a short circuit between the power amplifier and battery. THIS IS A MUST,
the amplifier's built-in fuse will only protect the power amplifier not the car's battery!
Use high grade wire connectors.
To ensure maximum power transfer and secure safe connections, it is recommended to
use high grade barrier spades (for connection at amplifier if applicable) and terminal rings
(for connection at battery).
Do not run any wires underneath vehicle.
Exposed wires have a chance of being cut or damaged. It is best to run all wires through
the vehicle under the carpet and/or side panels. This leads to a cleaner installation and
less risk of damage.
Use caution when mounting amplifier.
Remember there are many electrical wires, gas lines, vacuum lines, brake lines as well as a
gas tank in the automobile. Make sure you know where they are when mounting the
amplifier to avoid puncturing lines, shorting wires or drilling holes in the gas tank.
Run signal wires away from electrical wires.
To avoid possibility of induced noise from the car's electrical system (i.e. popping noises or
engine noise), run wires away from the car's electrical wiring.
ENGLISH
Make all ground wires as short as possible and at the same point.
In order to reduce the chance of ground loops (i.e. engine noise), make the grounding wire
as short as possible to reduce the wire's resistance. Also, when using multiple
components, make sure all units are grounded at the same point.
Avoid sharp edges when running the wires.
To avoid the possibility of power, signal or speaker shorts, be careful not to allow the
amplifiers wires to come in contact with sharp edges. Use a grommet to protect the wire
when running through the fire wall .
2
MGA AMPLIFIERS
FEATURES AND BENEFITS
DC Offset Protection
This circuit protects the output of the amplifier against DC voltage. If for some reason DC
voltage is detected at the output stage, the amplifier will shut down protecting the
speakers from direct current.
Short Circuit Protection
ENGLISH
This circuit protects the amplifier from damage due to a short found in the speakers or
wiring. If one of the speakers or its wiring comes in contact with ground, the amplifier will
shut down. To resume normal operation, correct the problem and turn the head unit off,
then back on. The amplifier will reset and play again.
Thermal Protection
To protect the amplifier circuitry against damage caused by prolonged exposure to high
temperatures, a thermal protection circuit is activated if the amplifier reaches
excessively high operating temperature. Once the thermal circuit is activated, the
amplifier will shut down to cool off. The amplifier will automatically turn back on once it
cools down to a safe operating temperature.
Built-in Crossover
The “MGA” amplifiers include a built-in variable high and low pass crossovers. The
crossover features a variable frequency selection (55Hz ~ 6kHz) for precise high or low
pass filtering.
Bass Boost
For added low frequency performance the amplifiers include a variable 0 ~16dB bass boost.
Power Fusing
This protects the amplifier against short circuits and excessive current.
Remote Turn-on
Automatically turns amplifier on when connected to the head unit's remote output. The
amplifier will turn on and off with the head unit to save current consumption. This control
also operates the reset circuit for the amplifier's protection. It must be connected with
the head unit in order to reset protection circuits.
Adjustable Input Sensitivity
Allows you to fine-tune the level matching between your source and the power amplifier.
3
MOUNTING LOCATION
Before you start the installation, it will be necessary to find a mounting location for the
amplifier. Find a location in which the amplifier will receive adequate ventilation in order
to dissipate the heat it develops during operation. Two popular mounting locations are in
the trunk or under the seat.
Select the location in which you wish to mount the amplifier. Use caution when mounting
amplifier, there are many wires, gas lines, vacuum lines, brake lines as well as a gas tank in
the automobile. Make sure you know where they are when mounting the amplifier to avoid
puncturing lines, shorting wires or drilling holes in the gas tank. Once you are ready, use a
pencil to mark the mounting holes in the bottom panel. After you have marked the locations
of the holes move amplifier out of the way and drill small starter holes to make the tapping
screws easier to install. Use provided screws to tighten down the amplifier.
ENGLISH
INPUT
FRONT
REAR
REAR
FRONT
REAR
SPEAKER
LEVEL IN
L
+
RL
-
(2 CH. IN)
+
RR
-
R
GND
BASS
GAIN
GAIN
BOOST
0
dB
16
SOURCE
FRONT
FREQ Hz
HIGH
110
LOW
FULL
55
240
600
330
4
2 CH. BASS
2 CH.
55
600
4 CH.
FREQ Hz
FREQ RANGE
110
240
330
STEREO
BRIDGED (F R IN)
L+R MONO
REAR
X 1
X 10
FRONT
POWER
FRONT
SPEAKER
LEVEL IN
REAR
+
L+R MONO
FL
-
BRIDGED (F L IN)
+
STEREO
HIGH
LOW
FR
-
GND
FULL
MGA AMPLIFIERS
ENGLISH
Panels slide off to make connections easier.
Be sure not to break plastic locking tabs!
CONNECTIONS
Rubber plugs can be removed to reveal
channels for C.H.I.L water cooling kit!
Removing these plugs makes panel removal
easier.
5
POWER CONNECTIONS
CHIL
RADIO'S REMOTE
RADIO'S REMOTE
TURN-ON OUTPUT
TURN-ON OUTPUT
FRONT
94.794.7
LEFT
2
REAR
BRIDGED
RIGHT
2
30 AMP X 2 MAX
4
MIN
TURN
+12V GND
ON
++
CAR BATTERY
CAR BATTERY
+12V
+12V
IN-LINE POWER FUSE
IN-LINE POWER FUSE
MOUNTED WITHIN 6”
MOUNTED WITHIN 6”
FROM BATTERY RECOMMENDED
FROM BATTERY RECOMMENDED
(NOT PROVIDED)(NOT PROVIDED)
--
IMPORTANT! Before making any connections, disconnect the car’s battery until the
installation is completed to avoid possible damage to the electrical system.
Connect the amplifier to the car's battery.
Make your power connections using a 4 gauge power wire for your connections. Strip one
end of the wire to connect to the terminal on the amplifier marked “+12V”. Loosen screw
terminal and connect bare wire and tighten. Use caution to make sure no stray wire
strands come in contact with surrounding terminals causing short circuits. Run the wire
directly to the positive terminal of the car's battery. Make sure to use an in-line fuse
within 6” of the car's battery to protect the electrical system and amplifier against short
circuits and/or power surges.
Connect the ground terminal of the amplifier to the car's chassis.
ENGLISH
For the ground connection, use an 4 gauge wire (black) to connect to the terminal marked
GND and then connect it to the car's chassis. Try to keep the length of the cable as short as
possible, preferably less than 6". Also make sure that the point on the car where the
connection is to be made is free of paint and dirt.
Connect the remote terminal of the amplifier to a switchable +12V source.
This connection allows the amplifier to be turned on and off with the power control of the
radio. If the radio has a REMOTE output terminal, connect it to the amplifier's terminal
marked “TURN-ON” (using a 16 gauge wire or heavier). Now when the radio is turned on, the
amplifier will automatically turn on.
6
MGA AMPLIFIERS
SIGNAL CONNECTIONS
Connect the RCA output of the head unit (AM/FM cassette player, CD, or DAT) to the RCA
input terminals of the amplifier.
To make these connections, we recommend high quality RCA cables, which are available at
your local car audio retailer. Run signal wires away from electrical wires to avoid
possibility of induced noise from the car's electrical system (i.e. popping noises or engine
noise). Please note that when making these connections the signal inputs correspond with
the speaker outputs.
ENGLISH
TWO CHANNEL INPUT
INPUT
FRONT
REAR
BASS
REAR
SPEAKER
LEVEL IN
L
+
RL
-
(2 CH. IN)
+
RR
-
R
GND
LL
RR
GAIN
GAIN
FREQ Hz
55
600
REAR
FRONT
2 CH. BASS
BOOST
0
dB
16
SOURCE
FRONT
HIGH
110
LOW
FULL
240
600
330
FRONT
POWER
STEREO
BRIDGED (F R IN)
2 CH.
L+R MONO
4 CH.
REAR
FREQ RANGE
X 1
FREQ Hz
X 10
110
LOW
55
240
330
REAR
L+R MONO
BRIDGED (F L IN)
STEREO
HIGH
FULL
FRONT
SPEAKER
LEVEL IN
+
FL
+
FR
-
GND
PLEASE SEE INPUT CONFIGURATION
SETTINGS ON PAGE 10
INPUT
FRONT
REAR
BASS
REAR
SPEAKER
LEVEL IN
L
+
RL
-
(2 CH. IN)
+
RR
-
R
GND
GAIN
GAIN
FREQ Hz
55
600
REAR
FRONT
2 CH. BASS
BOOST
0
dB
16
SOURCE
FRONT
HIGH
110
LOW
FULL
240
600
330
FRONT
POWER
STEREO
BRIDGED (F R IN)
2 CH.
L+R MONO
4 CH.
REAR
FREQ RANGE
X 1
FREQ Hz
X 10
110
LOW
55
240
330
REAR
L+R MONO
BRIDGED (F L IN)
STEREO
HIGH
FULL
FRONT
SPEAKER
LEVEL IN
+
FL
+
FR
-
GND
FOUR CHANNEL INPUT
RR
LL
RR
FRONT
REAR
LL
7
HIGH LEVEL CONNECTIONS (OPTIONAL)
High Level inputs have been included to connect the amplifier to a radio without low-level
outputs (i.e. factory radio). This connection will allow you to connect directly to the
speaker output of the radio with out the need of an external adapter.
Determine the type of radio you have and make one of the following connections.
CAUTION! Before making any connections determine the type of radio to avoid possible
damage to amplifier and/or radio.
ENGLISH
INPUT
FRONT
REAR
FRONT
REAR
SPEAKER
LEVEL IN
L
+
RL
-
(2 CH. IN)
+
RR
-
R
GND
GAIN
FREQ Hz
55
600
94.794.7
BLACK (GROUND)BLACK (GROUND)
WHITE/BLACKWHITE/BLACK
WHITEWHITE
GRAY/BLACKGRAY/BLACK
GRAYGRAY
(NOT USED)(NOT USED)
RIGHT -RIGHT -
RIGHT +RIGHT +
LEFT -LEFT -
LEFT +LEFT +
FLOATING GROUND RADIO (MOST COMMON TYPE)
INPUT
FRONT
REAR
FRONT
REAR
SPEAKER
LEVEL IN
L
+
RL
-
(2 CH. IN)
+
RR
-
R
GND
GAIN
FREQ Hz
55
600
94.794.7
REAR
BASS
GAIN
BOOST
0
dB
16
SOURCE
FRONT
HIGH
110
LOW
FULL
240
330
(NOT USED)(NOT USED)
2 CH. BASS
2 CH.
4 CH.
FREQ Hz
55
600
LEFT +LEFT +
LEFT -LEFT -
RIGHT +RIGHT +
RIGHT -RIGHT -
FREQ RANGE
110
240
330
STEREO
REAR
FRONT
BRIDGED (F R IN)
L+R MONO
STEREO
X 1
X 10
HIGH
LOW
GRAYGRAY
GRAY/BLACKGRAY/BLACK
WHITEWHITE
WHITE/BLACKWHITE/BLACK
BLACK (GROUND)BLACK (GROUND)
POWER
REAR
L+R MONO
BRIDGED (F L IN)
FULL
FRONT
SPEAKER
LEVEL IN
+
FL
+
FR
-
GND
PLEASE SEE INPUT CONFIGURATION
SETTINGS ON PAGE 10
REAR
BASS
GAIN
BOOST
0
dB
16
SOURCE
FRONT
HIGH
110
LOW
FULL
240
330
2 CH. BASS
2 CH.
FREQ Hz
55
600
FRONT
POWER
STEREO
BRIDGED (F R IN)
L+R MONO
4 CH.
REAR
FREQ RANGE
X 1
X 10
110
240
330
LOW
REAR
L+R MONO
BRIDGED (F L IN)
STEREO
HIGH
FULL
FRONT
SPEAKER
LEVEL IN
+
FL
+
FR
-
GND
COMMON GROUND RADIO
BLACKBLACK
WHITE/BLACKWHITE/BLACK
WHITEWHITE
GRAY/BLACKGRAY/BLACK
GRAYGRAY
GROUNDGROUND
(NOT USED)(NOT USED)
RIGHT +RIGHT +
(NOT USED)(NOT USED)
LEFT +LEFT +
8
LEFT +LEFT +
(NOT USED)(NOT USED)
RIGHT +RIGHT +
(NOT USED)(NOT USED)
GROUNDGROUND
GRAYGRAY
GRAY/BLACKGRAY/BLACK
WHITEWHITE
WHITE/BLACKWHITE/BLACK
BLACKBLACK
MGA AMPLIFIERS
SPEAKER CONNECTIONS
Make the speaker connections using speaker wire that is at least 16 gauge or heavier.
As with any audio component, proper phasing of the amplifier and speakers is essential for
strong bass response. When connecting, make sure that positive (+) from the amplifier is
connected to the positive (+) of the speaker, and the same for negative (-).
ENGLISH
LEFT
FRONT
REAR
4 Ohm
4 Ohm
2
BRIDGED
CHIL
(2 Ohm Minimum)
(2 Ohm Minimum)
RIGHT
2
30 AMP X 2 MAX
4
MIN
TURN
+12V GND
ON
4 Ohm
4 Ohm
(2 Ohm Minimum)
(2 Ohm Minimum)
SPEAKER CONNECTIONS (BRIDGED)
The MGA amplifiers are capable of being bridged in a mono configuration. This feature
allows you the flexibility of using the amplifier to drive a ** subwoofer or a center channel.
In this configuration the amplifier sums the right and left channel to deliver one channel
(mono) output.
**CAUTION! In the bridged mode, the amplifier must see the recommended minimum
impedance or higher. Any lower than the recommended minimum impedance will cause the
amplifier to overheat and possibly cause permanent damage to the amplifier!
LEFT
CHIL
2
FRONT
REAR
BRIDGED
RIGHT
2
30 AMP X 2 MAX
4
MIN
TURN
+12V GND
ON
(4 Ohm Minimum)
(4 Ohm Minimum)
9
8 Ohm
8 Ohm
ADJUSTING THE X-OVER AND BASS
2 CH. BASS = 2 channel input with bass boost on front and rear channels
2 CH = 2 channel input with bass boost on the front channel
4 CH = 4 channel input with bass boost on front channels only
You can add up to 16dB of bass boost
by adjusting the Bass Boost control.
point for your front speakers.
Select the source input
0
dB
16
FRONT
FREQ Hz
110
55
600
Select the crossover
Select the crossover type for the
LOW
240
330
front speakers
BASS
BOOST
2 CH. BASS
2 CH.
SOURCE
HIGH
FREQ Hz
FULL
55
600
Select the crossover
point for your rear speakers.
STEREO
BRIDGED (F R IN)
4 CH.
L+R MONO
REAR
FREQ RANGE
X 1
X 10
110
240
330
X-over Frequency Multiplier
Out = X1 (55Hz - 600Hz)
In = X10 (550Hz - 6Khz)
Select the operation mode for the
front and rear channels
FRONT
LOW
POWER
REAR
L+R MONO
BRIDGED (F L IN)
STEREO
HIGH
FULL
Select the crossover type for the
rear speakers
FINE TUNE THE SYSTEM
Fine tune the amplifier's input sensitivity.
GAIN
not a volume control and you will not get more power out of the amplifier in the maximum
position! It may seem to deliver more output, but actually the system is only playing louder
faster as you turn the volume control on the radio. Ideally, to properly level match the
system the goal is to achieve maximum output from the amplifier without distortion at
about 3/4 of the volume control.
The gain sensitivity control for the “MGA”
amplifier is located on the side panel. This gain control
has been included to allow adjustment to properly
match the output of the radio. This is one of the most
misunderstood adjustments. By rotating the control in
the clockwise direction, the amplifier‘s input will
become more sensitive and the music will play louder. This is
ENGLISH
To determine if the amplifier’s gain is set properly, turn the system on and slowly increase
the volume control. You should be able to use about 3/4 volume before the system gets loud
but not distorting. It is very important when making these adjustments that you do not
over drive the speakers (at point of distortion) this will cause permanent damage to the
speakers. If you are unable to achieve 3/4 volume before distortion you will need to
adjust gain control (in this case you would reduce the gain). The gain controls should be
adjusted very slowly. It may help to have another person to assist you by adjusting the
gain controls while you listen for distortion.
10
MGA AMPLIFIERS
TROUBLE SHOOTING THE SYSTEM
We have put together this trouble-shooting guide if you experience problems after
installing the amplifier. Please keep in mind that the majority of problems incurred are
caused by improper installation and not the equipment itself. In addition, there are many
components in the system that could cause various signal problems such as inducted
electrical noise and engine noise.
Before you can properly address the problem, you must first find the component that is
causing the problem. This will take patience and a process of elimination.
ENGLISH
LOOK FOR.... SOLUTION
No Output
Blown fuse Replace
Bad RCA Cable(s) Replace
+12V at power terminal Check connection
+12V at remote terminal Check connection
Grounding point clean and tight Check for ground w/meter
Head Unit's fader not in center position Set to center position
Low Output
Check level adjustments Re-adjust
Bad RCA cable(s) Replace
Improper level matching Re-adjust
Engine Noise
Grounding points are clean and tight Check for ground w/meter
Ground all components at same point Ground at same point
Try different grounding point Change for better ground
Bad RCA cable(s) Replace
Use High Quality shielded RCA cables Rejects inducted noise
Low Vehicle charging system and/or battery Fix and/or replace
Protection L.E.D. Illuminated
Speaker short Check speakers connection
for short circuit
Speaker grounding out Make sure speaker wires
do not touch chassis ground
Impedance too low Check speaker impedance
(Min 2 ohm Stereo, 4 Mono)
Overheating Check mounting location
for Adequate air Circulation
Speaker impedance too low
11
SPECIFICATIONS
MGA4150
Output Power @ 14.4 VDC :
4 ohm...................................................................................100W x 4
2 ohm...................................................................................150W x 4
Briged 4 Ohm............................................................................270W x 2
Frequency Response ...........................................................................10Hz- 20KHz
S/N Ratio (A-weight)................................................................................<100dB
THD (A-weight).....................................................................................0.30%
Low Input Level..................................................................................250mV-6V
Hi Input Level ..................................................................................400mV-12V
Battery Voltage Range .......................................................................10.5VDC-15VDC
Crossover Type ................................................................................HP/FULL/LP
Crossover Freq. Range (X1)......................................................................55Hz-600Hz
Crossover Freq. Range (X10).....................................................................550Hz-6kHz
Crossover Slope..................................................................................12dB/Oct
Bass EQ Boost......................................................................................0-16dB
Fuse ..........................................................................................30A x 2
Due to continuing product improvement, specifications subject to change without notice.
ENGLISH
12
MGA AMPLIFIERS
ENGLISH
Southern Audio Services, Inc., warrants all products to be free from defects in
material and workmanship for a period of one (1) year from the date of purchase. In
the event the product is not as warranted, SAS’ sole obligation shall be to repair or
replace the defective product at SAS’ option: SAS limits its obligation under any
implied warranties under state laws to a period not to exceed the limited warranty
period. SAS and its authorized BAZOOKA® dealers specifically disclaim liability for
any incidental or consequential damages. Some states do not allow limitations on
how long an implied warranty lasts, and some states do not allow the exclusion or
limitation of incidental or consequential damages, so the above limitation or
exclusions may not apply to you. This warranty gives you specific legal rights, and
you may have other rights, which vary from state to state.
What is covered: This warranty covers all defects in materials or workmanship
(parts and labor) in the product.
What is not covered: This warranty does not cover the following:
1. Damages occurring during shipment of the product to SAS for repair
(Claims must be presented to the carrier).
2. Damages caused by accident, abuse, negligence, misuse or improper
Operation or installation.
3. Damages caused by an act of God, including without limitation, fire, flood
Storm or other acts of nature.
4. Any product, which has a serial number, defaced, altered, modified, or
removed.
LIMITED WARRANTY
5. Any product that has been altered or modified without SAS’ consent.
13
Loading...