Autotek AXL1050.4 User Manual
AMPLIFIER FEATURE DESCRIPTIONS
AXL AMPLIFIERS:
Each multi channel model is capable of 4 & 2-Ohms stereo per channel, or 4-Ohms mono bridged
All Autotek amplifiers feature a comprehensive diagnostic system, with speaker lead short circuit, and
amplifier DC faults indicated by the red “PROTECT” LED.
amplifier DC faults indicated by the red “PROTECT” LED.
operation. The AXL1550.1 is stable at 4 & 2-Ohms while the AXL2550.1 is stable at 4, 2 & 1-Ohm.
CAUTION: DO NOT OPERATE ANY AMPLIFIER BELOW THE INTENDED IMPEDANCE. YOU
The input sensitivities for rated output powers are variable from 0.2 volts to 6 volts.
WILL CAUSE DAMAGE TO THE AMPLIFIER THAT WILL NOT BE COVERED UNDER THE
All crossovers are fully variable in their respective ranges.
Crossover filters are 12dB/Octave.
Crossover filters are 12dB/Octave.
WARRANTY PRINTED IN THE BACK OF THE MANUAL.
A POWER LED indicates the powered up and turned on condition
2
The 4 channel amps have the same features as the 2 channel models except that there are 2 sets of
controls.
1 set for channels 1 & 2 and 1 set for channels 3 & 4.
In addition, the 4 channel models have a MODE switch which allows for RCA signal routing and
selection.
The X-OVER slide switch selects the internal crossover functions:
-The input signal is routed directly to the LINE OUT RCA jacks, regardless of the X-OVER setting
simplifying daisy chaining of amplifiers.
-HPF: Selects the built in HIGH PASS filter, variable from 60 Hz to 1.2kHz.
-FULL: Bypasses all crossovers for full frequency range operation.
-LPF: Selects the built in LOW PASS , variable from 30 Hz to 250Hz.
MODE: The mode switch allows you to choose routing of signal within the amp.
-2CH Mode: In this mode, only inputs 1&2 are used. Input 1 (left)is internally routed to speaker
terminals 1&3, while input 2 (right)is internally routed to speaker terminals 2&4.
This is useful when only a stereo source is available. CH1&2 can be set to high pass for highs, and
CH3&4 to low pass for lows, for instance, or set to full range, depending on the application.
-3CH mode: In this mode, input 1&2 signals are internally mono mixed, and routed as a mono signal
to 1&2 speaker terminals. These outputs can be mono bridged into one speaker. Set CH1&2 to low
pass. Input 3 is internally routed to speaker terminal 3, and input 4 is internally routed to speaker
terminal 4. Set CH3&4 to high pass.
-4CH Mode: In this mode, each input is internally routed to the corresponding speaker terminals,
with input 1 to speaker terminal 1 etc.
HIGH INPUT: If your radio/CD player does not have unbalanced (RCA) outputs, you can use the
HIGH level (wire) inputs.
LINE INPUT: The line input accepts unbalanced (RCA) inputs from 0.2V to 6V.
LINE OUTPUT: The line output passes through signal from the line inputs which allows you to daisy
chain multiple amplifiers from one signal.
controls.
1 set for channels 1 & 2 and 1 set for channels 3 & 4.
In addition, the 4 channel models have a MODE switch which allows for RCA signal routing and
selection.
The X-OVER slide switch selects the internal crossover functions:
-The input signal is routed directly to the LINE OUT RCA jacks, regardless of the X-OVER setting
simplifying daisy chaining of amplifiers.
-HPF: Selects the built in HIGH PASS filter, variable from 60 Hz to 1.2kHz.
-FULL: Bypasses all crossovers for full frequency range operation.
-LPF: Selects the built in LOW PASS , variable from 30 Hz to 250Hz.
MODE: The mode switch allows you to choose routing of signal within the amp.
-2CH Mode: In this mode, only inputs 1&2 are used. Input 1 (left)is internally routed to speaker
terminals 1&3, while input 2 (right)is internally routed to speaker terminals 2&4.
This is useful when only a stereo source is available. CH1&2 can be set to high pass for highs, and
CH3&4 to low pass for lows, for instance, or set to full range, depending on the application.
-3CH mode: In this mode, input 1&2 signals are internally mono mixed, and routed as a mono signal
to 1&2 speaker terminals. These outputs can be mono bridged into one speaker. Set CH1&2 to low
pass. Input 3 is internally routed to speaker terminal 3, and input 4 is internally routed to speaker
terminal 4. Set CH3&4 to high pass.
-4CH Mode: In this mode, each input is internally routed to the corresponding speaker terminals,
with input 1 to speaker terminal 1 etc.
HIGH INPUT: If your radio/CD player does not have unbalanced (RCA) outputs, you can use the
HIGH level (wire) inputs.
LINE INPUT: The line input accepts unbalanced (RCA) inputs from 0.2V to 6V.
LINE OUTPUT: The line output passes through signal from the line inputs which allows you to daisy
chain multiple amplifiers from one signal.
Note that the LOW PASS signal is MONO.
-In the LPF position, the HIGH PASS filter acts as a subsonic filter.
-When the LPF mode is selected a 0 to +12dB, at 45Hz,
BASS EQ is also switched in.
-In the LPF position, the HIGH PASS filter acts as a subsonic filter.
-When the LPF mode is selected a 0 to +12dB, at 45Hz,
BASS EQ is also switched in.
AXL1050.4 / AXL1450.4 / AXL4050.4
4-CHANNEL AMPLIFIERS
MODE
X-OVER
X-OVER
2CH 3CH 4CH
FULL
FULL
HPF
HPF
LPF
LPF
CH3
CH4
CH1
CH2
INPUT
OUTPUT
INPUT
GND
CH1
GND
CH2
CH3
CH4
HIGH INPUT
BASS EQ
0dB
12dB
6V
0.2V
6V
0.2V
30Hz
250Hz
LPF
60Hz 1.2kHz
HPF
LEVEL
CHANNEL 1/2
LEVEL
BASS EQ
0dB
12dB
HPF
LPF
CHANNEL 3/4
60Hz 1.2kHz
30Hz
250Hz
The X-OVER slide switch selects the internal crossover functions:
-The input signal is routed directly to the LINE OUT RCA jacks, regardless of the X-OVER setting
simplifying daisy chaining of amplifiers.
-HPF: Selects the built in HIGH PASS filter, variable from 60 Hz to 1.2kHz.
-FULL: Bypasses all crossovers for full frequency range operation.
-LPF: Selects the built in LOW PASS , variable from 30 Hz to 250Hz.
MODE: The mode switch allows you to choose Stereo for full range 2 channel operation or MONO
for bridging operation
HIGH INPUT: If your radio/CD player does not have unbalanced (RCA) outputs, you can use the
HIGH level (wire) inputs.
LINE INPUT: The line input accepts unbalanced (RCA) inputs from 0.2V to 6V.
LINE OUTPUT: The line output passes through signal from the line inputs which allows you to daisy
chain multiple amplifiers from one signal.
-The input signal is routed directly to the LINE OUT RCA jacks, regardless of the X-OVER setting
simplifying daisy chaining of amplifiers.
-HPF: Selects the built in HIGH PASS filter, variable from 60 Hz to 1.2kHz.
-FULL: Bypasses all crossovers for full frequency range operation.
-LPF: Selects the built in LOW PASS , variable from 30 Hz to 250Hz.
MODE: The mode switch allows you to choose Stereo for full range 2 channel operation or MONO
for bridging operation
HIGH INPUT: If your radio/CD player does not have unbalanced (RCA) outputs, you can use the
HIGH level (wire) inputs.
LINE INPUT: The line input accepts unbalanced (RCA) inputs from 0.2V to 6V.
LINE OUTPUT: The line output passes through signal from the line inputs which allows you to daisy
chain multiple amplifiers from one signal.
Note that the LOW PASS signal is MONO.
-In the LPF position, the HIGH PASS filter acts as a subsonic filter.
-When the LPF mode is selected, a 0 to +12dB, at 45Hz, BASS -EQ is also
switched in.
-In the LPF position, the HIGH PASS filter acts as a subsonic filter.
-When the LPF mode is selected, a 0 to +12dB, at 45Hz, BASS -EQ is also
switched in.
AXL1050.2 / AXL1650.2
2-CHANNEL AMPLIFIERS
AXL3050.2
FULL LPF
MODE
X-OVER
BASS EQ
0dB 12dB
HPF
LPF
HPF
60Hz 1.2kHz30Hz 250Hz
STEREO
MONO
L
R
L
R
LINE OUT
LINE INPUT
GND
HI INPUT
LEVEL
6V
0.2V
FULL LPF
MODE
X-OVER
BASS EQ
0dB 12dB
HPF
LPF
HPF
60Hz 1.2kHz30Hz 250Hz
STEREO
MONO
L
R
L
R
LINE OUT
LINE INPUT
GND
HI INPUT
LEVEL
6V
0.2V
-SUBSONIC: Allows you to adjust the crossover filter from 15Hz to 55Hz.
-LPF: Allows yo to adjust the LOW PASS crossover filter from 40Hz to 150Hz.
LEVEL: Adjusts the input sensitivity from 0.2 volts to 6 volts.
BASS EQ: The Bass EQ is adjustable from 0db to 12dB.
REMOTE: This is the input jack for the remote Level control.
LINE INPUT: The line input accepts unbalanced (RCA) inputs from 0.2V to 6V.
LINE OUTPUT: The line output passes through signal from the line inputs which allows you to daisy
chain multiple amplifiers from one signal.
-LPF: Allows yo to adjust the LOW PASS crossover filter from 40Hz to 150Hz.
LEVEL: Adjusts the input sensitivity from 0.2 volts to 6 volts.
BASS EQ: The Bass EQ is adjustable from 0db to 12dB.
REMOTE: This is the input jack for the remote Level control.
LINE INPUT: The line input accepts unbalanced (RCA) inputs from 0.2V to 6V.
LINE OUTPUT: The line output passes through signal from the line inputs which allows you to daisy
chain multiple amplifiers from one signal.
The AXL1550.1 is capable of 4 & 2-Ohm loads.
The AXL2550.1 is capable of 4, 2 & 1-Ohm loads.
Operating the amp below the Ohm listed above can cause damage to the amp
not covered in the warranty.
The AXL2550.1 is capable of 4, 2 & 1-Ohm loads.
Operating the amp below the Ohm listed above can cause damage to the amp
not covered in the warranty.
AXL1550.1 / AXL2550.1
1-CHANNEL MONO BLOCK AMPLIFIERS
40Hz
150Hz
LOW
PASS
LEVEL
6V 0.2V
BASS
POWER
PROTECT
EQ
0dB
12dB
CONTROL
REMOTE
CONTROL
REMOTE
15Hz
55Hz
SUB SONIC
L
R
L
R
OUTPUT
INPUT