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 audioamplifier. Your new amplifier has been built to the highest standards of quality andis 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 ifpurchased from an authorized Sundown Audio dealer. This warranty does notcover improper installation, accidental damage, misuse, abuse, improperwiring, operation of unit outside of listed specifications, or any product thathas been modified or repaired by anyone other than Sundown Audio. Thiswarranty is transferrable provided the original invoice or receipt is stillwith 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 beaccompanied by the original sales invoice or receipt. For faster warrantyservice please contact us at sundownz@sundownaudio.com to request areturn authorization code. At the sole discretion of Sundown Audio youramplifier will be either repaired or replaced.

If no defect is found and the unit must be shipped back the customer isresponsible for return freight, if the unit is truly defective the replaced orrepaired unit will be shipped back prepaid. In the event of shipping damagedue to improper packaging of the return the customer is liable for the costof all damages, necessary repairs, or replacement. Be sure to properly packyour 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 totake 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 nottransferrable like the 2 year limited warranty. As is the case with standardwarranty claims the return MUST be sent prepaid and with a copy of theoriginal invoice or receipt.

RETURN ADDRESS:

Sundown AudioATTN: WARRANTY SERVICE151 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 AmplifierMOSFET PWM Power SupplyStable Into 4 Ohms Bridged or 2 Ohms Stereo LoadVariable Subsonic FilterIndependent 1/2 and 3/4 Channel High Pass Filter Variable with x 10 Range Selectable SwitchIndependent 1/2 and 3/4 Channel Low Pass Filter Variable with x 10 Range Selectable SwitchHPF/FULL/LPF Selectable SwitchIndependent 1/2 and 3/4 Channel Electronic Crossover Slope Selectable Switch with 12dB and 24dB OctaveVariable Input Level ControlInput Sensitivity : 200mV ~ 6VSubsonic Filter : 10Hz ~ 500HzSignal Input and Line Out RCA ConnectorsMulti-Way Protection circuitry (Thermal/Over Current/Speaker Short/Speaker DC protection)

Tested Voltage & THD: 14.4V & Less than 0.05% THDOperating Voltage : DC10V~16V Power InputWired Remote Controller

2/1 Channel Bridgeable Class-AB AmplifierMOSFET PWM Power SupplyStable Into 4 Ohms Bridged or 2 Ohms Stereo Load12dB Octave Electronic Crossover SlopeVariable Subsonic FilterHigh Pass Filter Variable with x 10 Range Selectable SwitchLow Pass Filter Variable with x 10 Range Selectable SwitchHPF/FULL/LPF Selectable SwitchVariable Bass Boost ControlVariable Bass-Boost Frequency ControlVariable Input Level ControlInput Sensitivity : 200mV ~ 6VSubsonic Filter : 10Hz ~ 500HzSignal Input and Line Out RCA ConnectorsMulti-Way Protection circuitry (Thermal/Over Current/Speaker Short/Speaker DC protection)

Tested Voltage & THD: 14.4V & Less than 0.05% THDOperating Voltage : DC10V~16V Power InputWired Remote Controller

4/3/2 Channel Bridgeable Class-AB AmplifierMOSFET PWM Power SupplyStable Into 4 Ohms Bridged or 2 Ohms Stereo Load12dB Octave Electronic Crossover SlopeVariable Subsonic FilterIndependent 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 ControlVariable Bass-Boost Frequency ControlVariable Input Level ControlInput Sensitivity : 200mV ~ 6VSubsonic Filter : 10Hz ~ 500HzSignal Input and Line Out RCA ConnectorsMulti-Way Protection circuitry (Thermal/Over Current/Speaker Short/Speaker DC protection)

Tested Voltage & THD: 14.4V & Less than 0.05% THDOperating Voltage : DC10V~16V Power InputWired Remote Controller

Specifications

50W x 4CH80W x 4CH160W x 2CH>90dB 50Hz~500Hz (CH1&2) 50Hz~5KHz (CH3&4) 50Hz~5KHz (CH1&2)50Hz~500Hz (CH3&4)10Hz to 500Hz 0~18dB35Hz to 120Hz 10Hz ~ 40KHz (+/-1dB)

75dB 25A x 2Variable 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 2CH200W x 2CH400W x 1CH>90dB50Hz ~ 5KHz30Hz ~ 3KHz10Hz to 500Hz 0~18dB35Hz to 120Hz 10Hz ~ 40KHz (+/-1dB) <0.1% 75dB 20A x 3Variable 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 4CH160W x 4CH320W x 2CH>90dB50Hz ~ 5KHz50Hz ~ 5KHz10Hz to 500Hz 10Hz ~ 40KHz (+/-1dB) <0.1% 75dB 30A x 3Variable 200mV~6V (+/- 5%)252(W) x 58(H) x 480(L)mm

BASS REMOTE

HPF

FREQ.

LPF CH1

CH2

PROTECTION

LINE OUTPOWER

1KHz50Hz

18dB0dB250Hz30Hz 120Hz35Hz

BASS BOOST

120Hz35Hz

BASS BOOST

18dB0dB

Q0.2V6V 100Hz10Hz 500Hz50Hz

x1 x10

x1 x10

SUBSONICGAIN

GAIN SUBSONIC

CH1 CH3

SIGNAL INPUT

CH2 CH4

0.2V6V 100Hz10Hz

HPF

500Hz50Hz

LPF

RANGE

RANGE HPFFULL

LPF

LPFFULL

HPF

Channel 3/4Channel 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

RANGEX1 X10

FULL

LPFHPF

REMOTEBASS BOOSTLPF

RANGEX1 X10

FREQ. Q.

INPUTCH1

CH2 0.2V6V 500Hz10Hz 300Hz30Hz 500Hz50Hz 120Hz35Hz 18dB0dB

CH1

CH2

OUTPUT

INPUT

CH1 CH3

CH2 CH4

GAIN

0.2V6V 500Hz10Hz

SUBSONIC

500Hz50Hz

HPF12dB

24dB

X1

X10

CHANNEL 3/4

CHANNEL 1/2

0.2V6V 500Hz10Hz 500Hz50Hz

12dB

24dB

X1

X10

HPFFULL

LPF

CH1

CH2

REMOTE

OUTPUT

500Hz50Hz

LPF12dB

24dB

X1

X10

500Hz50Hz

12dB

24dB

X1

X10

LPF

Protection

Power

HPFFULL

LPFHPFGAIN SUBSONIC

to OUTPUTof 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

POWERFUSE

SPEAKER

B+ REM GND

FUSEPOWER SPEAKER

Left

BRIDGEB+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-onfrom HEAD UNIT

GROUND

To +12V DC

REMOTEConnect the REM terminal to either the remote output lead from the radio or another switched 12V supply such as the power antenna wire.

+12V PowerConnect 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.

GROUNDDisconnect 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-onfrom HEAD UNIT

GROUND

To +12V DC

POWER

B+REMGND

FUSE

POWER

BRIDGERight/Ch2Left/Ch1

Right/Ch4Left/Ch3

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BATTERY

to REMOTE Turn-onfrom 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 Impedance4~8 ohms

CH3-MONO

CH2

CH1

Speaker Impedance4~8 ohms

CH2

CH1

SUBWOOFER

Speaker Impedance2~8 ohms

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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-MONOSUBWOOFER

CH2-MONOSUBWOOFER

4 Channel Stereo

CH4

CH2

CH1

6 Channel Tri Mode

CH4

CH2CH1

Speaker Impedance4~8 ohms

Speaker Impedance2~8 ohms

Speaker Impedance4~8 ohms

CH6-MONOSUBWOOFER

CH5-MONOSUBWOOFER

CH3

Speaker Connection

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SAX-50.4

FUSE

POWER

BRIDGERight/Ch2Left/Ch1

Right/Ch4Left/Ch3

FUSE

POWER

BRIDGERight/Ch2Left/Ch1

Right/Ch4Left/Ch3

FUSE

POWER

BRIDGERight/Ch2Left/Ch1

Right/Ch4Left/Ch3

2 Channel Bridged

CH3

CH1-MONOSUBWOOFER

CH2-MONOSUBWOOFER

4 Channel Stereo

CH4

CH2

CH1

6 Channel Tri Mode

CH4

CH2CH1

Speaker Impedance4~8 ohms

Speaker Impedance2~8 ohms

Speaker Impedance4~8 ohms

CH6-MONOSUBWOOFER

CH5-MONOSUBWOOFER

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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MADE IN KOREA