Sundown Audio SAX-100.4D User manual

SAX-125.2
SAX-50.4
SAX-100.4
Owner's manual

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Congratulations on your purchase of a Sundown Audio high performance car audio
amplifier. Your new amplifier has been built to the highest standards of quality and
is intended to serve you for years to come.
Visit us online at http://www.sundownaudio.com
WARRANTY:
Your new Sundown Audio amplifier is covered by a 2 year limited warranty if
purchased from an authorized Sundown Audio dealer. This warranty does not
cover improper installation, accidental damage, misuse, abuse, improper
wiring, operation of unit outside of listed specifications, or any product that
has been modified or repaired by anyone other than Sundown Audio. This
warranty is transferrable provided the original invoice or receipt is still
with the unit so that its new owner can prove date and place of purchase.
All warranty returns must be sent freight prepaid to Sundown Audio and be
accompanied by the original sales invoice or receipt. For faster warranty
service please contact us at [email protected] to request a
return authorization code. At the sole discretion of Sundown Audio your
amplifier will be either repaired or replaced.
If no defect is found and the unit must be shipped back the customer is
responsible for return freight, if the unit is truly defective the replaced or
repaired unit will be shipped back prepaid. In the event of shipping damage
due to improper packaging of the return the customer is liable for the cost
of all damages, necessary repairs, or replacement. Be sure to properly pack
your return!
Sundown Audio also offers a 5 year guarantee to our customers for a
discounted replacement unit. We are so certain of the quality of our equipment
that even if you are at fault for causing damage to your amplifier we will offer
you a new unit at a reduced cost compared to MSRP. Contact us via e-mail to
take advantage of this offer, even though we doubt you will ever need to!
This offer applies ONLY to the original purchaser of the unit and is not
transferrable like the 2 year limited warranty. As is the case with standard
warranty claims the return MUST be sent prepaid and with a copy of the
original invoice or receipt.
RETURN ADDRESS:
Sundown Audio
ATTN: WARRANTY SERVICE
151 Rebel Hill DR.
Mooresville NC, 28115

Features
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SAX-125.2
SAX-50.4
SAX-100.4
4/3/2 Channel Bridgeable Class-AB Amplifier
MOSFET PWM Power Supply
Stable Into 4 Ohms Bridged or 2 Ohms Stereo Load
Variable Subsonic Filter
Independent 1/2 and 3/4 Channel High Pass Filter Variable
with x 10 Range Selectable Switch
Independent 1/2 and 3/4 Channel Low Pass Filter Variable
with x 10 Range Selectable Switch
HPF/FULL/LPF Selectable Switch
Independent 1/2 and 3/4 Channel Electronic Crossover Slope Selectable
Switch with 12dB and 24dB Octave
Variable Input Level Control
Input Sensitivity : 200mV ~ 6V
Subsonic Filter : 10Hz ~ 500Hz
Signal Input and Line Out RCA Connectors
Multi-Way Protection circuitry (Thermal/Over Current/Speaker Short/Speaker DC protection)
Tested Voltage & THD: 14.4V & Less than 0.05% THD
Operating Voltage : DC10V~16V Power Input
Wired Remote Controller
2/1 Channel Bridgeable Class-AB Amplifier
MOSFET PWM Power Supply
Stable Into 4 Ohms Bridged or 2 Ohms Stereo Load
12dB Octave Electronic Crossover Slope
Variable Subsonic Filter
High Pass Filter Variable with x 10 Range Selectable Switch
Low Pass Filter Variable with x 10 Range Selectable Switch
HPF/FULL/LPF Selectable Switch
Variable Bass Boost Control
Variable Bass-Boost Frequency Control
Variable Input Level Control
Input Sensitivity : 200mV ~ 6V
Subsonic Filter : 10Hz ~ 500Hz
Signal Input and Line Out RCA Connectors
Multi-Way Protection circuitry (Thermal/Over Current/Speaker Short/Speaker DC protection)
Tested Voltage & THD: 14.4V & Less than 0.05% THD
Operating Voltage : DC10V~16V Power Input
Wired Remote Controller
4/3/2 Channel Bridgeable Class-AB Amplifier
MOSFET PWM Power Supply
Stable Into 4 Ohms Bridged or 2 Ohms Stereo Load
12dB Octave Electronic Crossover Slope
Variable Subsonic Filter
Independent 1/2 Channel High Pass Filter Variable with x 10 Range Selectable Switch
Variable 1/2 Channel Low Pass Filter with HPF/FULL/LPF Selectable Switch
Independent 3/4 Channel Low Pass Filter Variable with x 10 Range Selectable Switch
Variable 3/4 Channel High Pass Filter with HPF/FULL/LPF Selectable Switch
Independent 1/2 and 3/4 Channel Bass Boost Variable Control
Variable Bass-Boost Frequency Control
Variable Input Level Control
Input Sensitivity : 200mV ~ 6V
Subsonic Filter : 10Hz ~ 500Hz
Signal Input and Line Out RCA Connectors
Multi-Way Protection circuitry (Thermal/Over Current/Speaker Short/Speaker DC protection)
Tested Voltage & THD: 14.4V & Less than 0.05% THD
Operating Voltage : DC10V~16V Power Input
Wired Remote Controller

Specifications
50W x 4CH
80W x 4CH
160W x 2CH
>90dB
50Hz~500Hz (CH1&2)
50Hz~5KHz (CH3&4)
50Hz~5KHz (CH1&2)
50Hz~500Hz (CH3&4)
10Hz to 500Hz
0~18dB
35Hz to 120Hz
10Hz ~ 40KHz (+/-1dB)
75dB
25A x 2
Variable 200mV~6V (+/- 5%)
252(W) x 58(H) x 310(L)mm
<0.1%
Rated power output
-RMS Watt @ 4 Ohms -----------------------------
-RMS Watt @ 2 Ohms -----------------------------
-Bridged Power @ 4 Ohms -----------------------
Signal to Noise Ratio -----------------------------------
Low Pass Crossover -----------------------------------
------------------------------------
High Pass Crossover -----------------------------------
-----------------------------------
--------------------------------
Bass Boost -------------------------------------------------
--------
Frequency Response -----------------------------------
THD@RMS Watts ----------------------------------------
Channel Separation --------------------------------------
Fuse Rating -------------------------------------------------
Input Sensitivity -------------------------------------------
Dimensions -------------------------------------------------
Variable Subsonic Filter
Variable Bass-Boost Frequency Control
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SAX-125.2
SAX-50.4
SAX-100.4
Rated power output
-RMS power, 4 ohm stereo -----------------------
-RMS power, 2 ohm stereo ----------------------
-RMS power, 4 ohm bridged ---------------------
Signal to Noise Ratio -----------------------------------
Low Pass Crossover -----------------------------------
High Pass Crossover -----------------------------------
--------------------------------
Bass Boost -------------------------------------------------
--------
Frequency Response ------------------------------------
THD@RMS Watts -----------------------------------------
Channel Separation --------------------------------------
Fuse Rating -------------------------------------------------
Input Sensitivity -------------------------------------------
Dimensions --------------------------------------------------
Variable Subsonic Filter
Variable Bass-Boost Frequency Control
125W x 2CH
200W x 2CH
400W x 1CH
>90dB
50Hz ~ 5KHz
30Hz ~ 3KHz
10Hz to 500Hz
0~18dB
35Hz to 120Hz
10Hz ~ 40KHz (+/-1dB)
<0.1%
75dB
20A x 3
Variable 200mV~6V (+/- 5%)
252(W) x 58(H) x 340(L)mm
Rated power output
-RMS power, 4 ohm stereo -----------------------
-RMS power, 2 ohm stereo ----------------------
-RMS power, 4 ohm bridged ---------------------
Signal to Noise Ratio -----------------------------------
Low Pass Crossover -----------------------------------
High Pass Crossover -----------------------------------
--------------------------------
Frequency Response ------------------------------------
THD@RMS Watts ----------------------------------------
Channel Separation --------------------------------------
Fuse Rating -------------------------------------------------
Input Sensitivity -------------------------------------------
Dimensions --------------------------------------------------
Variable Subsonic Filter
100W x 4CH
160W x 4CH
320W x 2CH
>90dB
50Hz ~ 5KHz
50Hz ~ 5KHz
10Hz to 500Hz
10Hz ~ 40KHz (+/-1dB)
<0.1%
75dB
30A x 3
Variable 200mV~6V (+/- 5%)
252(W) x 58(H) x 480(L)mm

BASS REMOTE
HPF
FREQ.
LPF CH1
CH2
PROTECTION
LINE OUT
POWER
1KHz
50Hz
18dB0dB
250Hz
30Hz 120Hz
35Hz
BASS BOOST
120Hz
35Hz
BASS BOOST
18dB0dB
Q
0.2V
6V 100Hz
10Hz 500Hz
50Hz
x1 x10
x1 x10
SUBSONIC
GAIN
GAIN SUBSONIC
CH1 CH3
SIGNAL INPUT
CH2 CH4
0.2V
6V 100Hz
10Hz
HPF
500Hz
50Hz
LPF
RANGE
RANGE
HPF
FULL
LPF
LPF
FULL
HPF
Channel 3/4
Channel 1/2
to INPUT of
ADDITIONAL AMPLIFIERS
to
OUTPUT
of
HEAD UNIT
RCA Connection
This amplifier utilizes RCA type low-level input terminals. Input level is set by
adjusting the "GAIN" knob, which controls both channels. As illustrated
above the "Input" RCA pair is connected to the output of the radio via RCA to
RCA cables.
Wired Remote Controller
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It only engages channels 3+4
when the LPF is enabled on those channels.
SAX-125.2
SAX-50.4
SAX-100.4
GAIN
Protection
Power
SUBSONIC HPF
RANGE
X1 X10
FULL
LPF
HPF
REMOTE
BASS BOOST
LPF
RANGE
X1 X10
FREQ. Q.
INPUT
CH1
CH2
0.2V
6V 500Hz 10Hz 300Hz 30Hz 500Hz 50Hz 120Hz 35Hz 18dB 0dB
CH1
CH2
OUTPUT
INPUT
CH1 CH3
CH2 CH4
GAIN
0.2V
6V 500Hz
10Hz
SUBSONIC
500Hz
50Hz
HPF
12dB
24dB
X1
X10
CHANNEL 3/4
CHANNEL 1/2
0.2V
6V 500Hz
10Hz 500Hz 50Hz
12dB
24dB
X1
X10
HPF
FULL
LPF
CH1
CH2
REMOTE
OUTPUT
500Hz
50Hz
LPF
12dB
24dB
X1
X10
500Hz
50Hz
12dB
24dB
X1
X10
LPF
Protection
Power
HPF
FULL
LPF
HPFGAIN SUBSONIC
to OUTPUT
of HEAD UNIT to INPUT of
ADDITIONAL AMPLIFIERS
Wired Remote Controller
to INPUT of
ADDITIONAL AMPLIFIERS
to
OUTPUT
of
HEAD UNIT Wired Remote Controller
It only engages channels 3+4
when the LPF is enabled on those channels.

BRIDGE
Left/Ch1
Left/Ch3 Right/Ch4
Right/Ch2
POWER
FUSE
SPEAKER
B+ REM GND
FUSE
POWER SPEAKER
Left
BRIDGE
B+REMGND
Right
Power Connection
First make the ground connection, then +12V wire connection and finally the
remote connection. Furthermore, the +12V wire must always be fused at the
battery for protection against possible damage. If you need to replace the power
fuse, replace it with a fuse of the same value. It may result in a serious hazard
to use a fuse of a different type or rating.
Caution
BATTERY
to REMOTE Turn-on
from HEAD UNIT
GROUND
To +12V DC
REMOTE
Connect the REM terminal to either the remote output lead from the radio or
another switched 12V supply such as the power antenna wire.
+12V Power
Connect the +12V terminal of the amplifier to the + terminal of the battery
using a large gauge power wire (preferably 4 gauge). It is critical to utilize
an in-line fuse within 8 inches of the battery to ensure safe operation of the
amplifier. Make sure that the fuse is not installed while you are connecting
the + wire to the battery terminal to avoid sparking and possible injury or
damage.
GROUND
Disconnect the battery and connect the GND (ground) terminal to the cars
chassis. Keep this cable as short as possible (not longer than 10 inches).
Be certain that the chassis ground point is free of rust, paint, and grime to
ensure a solid electrical connection.
SAX-125.2
SAX-50.4
SAX-100.4
BATTERY
to REMOTE Turn-on
from HEAD UNIT
GROUND
To +12V DC
POWER
B+REMGND
FUSE
POWER
BRIDGE
Right/Ch2Left/Ch1
Right/Ch4Left/Ch3
-6-
BATTERY
to REMOTE Turn-on
from HEAD UNIT
GROUND
To +12V DC

FUSE SPEAKER
Left
BRIDGE
Right
FUSE SPEAKER
Left
BRIDGE
Right
FUSE SPEAKER
Left
BRIDGE
Right
Speaker Connection
SAX-125.2
1 Channel Bridged
2 Channel Stereo
3 Channel Tri-Mode
SUBWOOFER
CH1-MONO
Speaker Impedance
4~8 ohms
CH3-MONO
CH2
CH1
Speaker Impedance
4~8 ohms
CH2
CH1
SUBWOOFER
Speaker Impedance
2~8 ohms
-7-

BRIDGE
Left/Ch1
Left/Ch3 Right/Ch4
Right/Ch2
FUSE
SPEAKER
BRIDGE
Left/Ch1
Left/Ch3 Right/Ch4
Right/Ch2
FUSE
SPEAKER
BRIDGE
Left/Ch1
Left/Ch3 Right/Ch4
Right/Ch2
FUSE
SPEAKER
2 Channel Bridged
CH3
CH1-MONO
SUBWOOFER
CH2-MONO
SUBWOOFER
4 Channel Stereo
CH4
CH2
CH1
6 Channel Tri Mode
CH4
CH2 CH1
Speaker Impedance
4~8 ohms
Speaker Impedance
2~8 ohms
Speaker Impedance
4~8 ohms
CH6-MONO
SUBWOOFER
CH5-MONO
SUBWOOFER
CH3
Speaker Connection
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SAX-50.4

FUSE
POWER
BRIDGE
Right/Ch2Left/Ch1
Right/Ch4Left/Ch3
FUSE
POWER
BRIDGE
Right/Ch2Left/Ch1
Right/Ch4Left/Ch3
FUSE
POWER
BRIDGE
Right/Ch2Left/Ch1
Right/Ch4Left/Ch3
2 Channel Bridged
CH3
CH1-MONO
SUBWOOFER
CH2-MONO
SUBWOOFER
4 Channel Stereo
CH4
CH2
CH1
6 Channel Tri Mode
CH4
CH2 CH1
Speaker Impedance
4~8 ohms
Speaker Impedance
2~8 ohms
Speaker Impedance
4~8 ohms
CH6-MONO
SUBWOOFER
CH5-MONO
SUBWOOFER
CH3
Speaker Connection
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SAX-100.4

This power amplifier has protection features to prevent any damages from misuse or faulty
conditions. If the unit senses excessive heat, short circuited speakers or overload, the
protection indicators will light, and the system will be turned off. In order to check the
occurred problem, you should turn all levels down and all power off and carefully check the
installation for wiring mistakes or short. If the amplifier shuts down due to excessive heat,
the protection indicators will not light : simply allow time for the unit to cool.
Before removing your amplifier, refer to the list below and follow the suggested procedures.
Always test the speakers and their wires first.
PROTECTION LED ILLUMINATES WHEN AMPLIFIER IS POWERED UP
FUSE BLOWING
OVERHEATING
Check that the minimum speaker impedance is correct.
Check speaker shorts.
Check that there is a good airflow around the amplifier.
Check a good ground and for speaker shorts.
Disconnect all RCA inputs from the amplifier. If hiss/noise disappears, check
it with a good RCA interconnect. Then check the component driving the
amplifier.
SOUND TOO LOW-DISTORTED SOUND
Check that the input level control is set to match the output level of the unit.
Check the head unit volume.
Check speaker shorts.
Check that crossover frequencies have been properly set.
HIGH HISS-ENGINE NOISE IN SPEAKERS
Check that the minimum speaker impedance is correct.
Check short on power cable and vehicle chassis.
AMPLIFIER IS NOT POWERED UP
Check that there is battery power on the +12V terminal.
Check that remote terminal has at least 13.8V DC remote connection.
Check a good ground connection. Check all fuses.
Check the protection LED is not lit.
Check shorts on speaker wires.
Remove speaker wires and reset the amplifier. If the protection LED still
comes on, then the amplifier is faulty.
Trouble Shooting
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