Sundown Audio SFB Series User manual

Mono Blocks:
SFB 600D
SFB 1000D
SFB 1500D
SFB 2000D
SFB 3000D
SIA 3500D
SFB 5000D
SFB 8000D
SFB 13500D
Multi - Channel
SFB 200.4D
SFB 500.4D
SFB 1000.4D
SFB 1800.5D
This manual is intended to be a guide, installation by a qualified professional is recommended

SFB SERIES AMPLIFIER OWNER’S MANUAL version 01/21 v2
 Digital Class-D Mono Block Amplifier
 Dual MOS-FET PWM Power Supply
 1 Ohm Stable Load
 12 dB/Octave - Variable Low Pass Filter
 0 to 12dB - Variable Bass Boost
 4 Way Protection Circuit (Thermal,
Voltage Speaker short and DC Offset)
 Wired Remote Control with Clipping
Indicator.
Tested
@14.4Volts
SFB-
600D
SFB-
1000D
SFB-
1500D
SFB-
2000D
SFB-
3000D
SFB-
5000D
SFB-
8000D
SFB-
13500D
SIA-
3500D
1Ω Mono RMS 600W 1000W 1500W 2000W 3000W 5000W 8000W 13500W 3500W
2Ω Mono RMS 350W 850W 1200W 1500W 2000W 3200W 5000W 8100W 3000W
4Ω Mono RMS 250W 500W 650W 950W 1100W 2200W 3250W 5500W 1750W
Recommended
Fuse Rating
60A 100A 140A 180A 250A 220A
x2
350A
x2
400A x3 300A
LoW Pass Filter
(-12dB/8)
Variable
80HZ - 20kHz 40Hz -
20kHz
High Pass Filter
(-12dB/8)
Variable
15 - 1kHz 15 - 80Hz 10hz -
1kHz
LEVEL (Bass
Boost)
0 - 12dB (50Hz)
Input Sensitivity 5V Max
Signal Noise
Ratio
86dB 100dB 100dB 100dB 86dB 100dB 100dB 100dB 108dB
Working Voltage 10.5V - 15.5V DC
Width mm 185mm 185mm 185mm 185mm 229mm 229mm 229mm 229mm 229mm
Length mm 127mm 147mm 172mm 191mm 210mm 293mm 420mm 521mm 229mm
Height mm 64mm 64mm 64mm 64mm 64mm 70mm 70mm 70mm 70mm
Width inches 7.25" 7.25" 7.25" 7.25" 9.00" 9.00" 9.00" 9.00" 9.00"
Length inches 5.00" 5.75" 6.75" 7.50" 8.25" 11.50" 16.50" 20.50" 9.00"
Height inches 2.50" 2.50" 2.50" 2.50" 2.50" 2.75" 2.75" 2.75" 2.75"
DIGITAL
MONOBLOCK FEATURES
DIGITAL MONOBLOCK
SPECIFICATIONS

SFB SERIES AMPLIFIER OWNER’S MANUAL version 01/21 v2
 High Efficiency Digital Multi-Channel
Design
 12dB/Octave-Variable High Pass Filter
 12dB/Octave-Variable Low Pass Filter
 Clipping Indicator
 4 Way Protection Circuit (Thermal,
Voltage Speaker short and DC Offset)
 Optional Wired Remote Control with
Clipping Indicator.
Tested @14.4Volts SFB-200.4D SFB-500.4D SFB-1000.4D SFB-1800.5D
1Ω RMS 200W / CH 500W / CH 1000W / CH 1Ω NOT SUPPORTED (CH1-4)
1000W (CH5)
2Ω RMS 125W / CH 300W / CH 550W / CH 300W (CH1-4)
500W (CH5)
4Ω RMS 75W / CH 200W / CH 325W / CH 200W (CH1-4)
250W (CH5)
Recommended Fuse
Rating
80A 180A 350A 150A
Low Pass Filter
(-12dB/8) Variable 50Hz - 6kHz 50Hz - 6kHz 50hz - 20kHz (CH5)
High Pass Filter
(-12dB/8) Variable 15Hz - 6kHz 15Hz - 6kHz 15hz - 1kHz (CH5)
LEVEL (Bass Boost) 0 - 12dB (50Hz)
Input Sensitivity 5V Max
Signal Noise Ratio 100dB
Working Voltage 10.5V-15.5V DC
Width mm 185mm 210mm 229mm 229mm
Length mm 216mm 248mm 293mm 318mm
Height mm 64mm 70mm 70mm 70mm
Width inches 7.25" 8.25" 9.00" 9.00"
Length inches 8.50" 9.75" 11.50" 12.50"
Height inches 2.50" 2.75" 2.75" 2.75"
FULL RANGE
DIGITAL
SPECIFICATIONS
FULL RANGE DIGITAL
FEATURES

SFB SERIES AMPLIFIER OWNER’S MANUAL version 01/21 v2
CH1-CH5 RCA’s: RCA signal from source
CH1-CH5 SPEAKER OUTPUTS- This is where your speakers plug in, see the amp specific
diagrams for assistance.
GAIN- NOT A VOLUME KNOB, THE INTERNET IS LYING TO YOU 😊, used
to set the input signal levels, start from Min and slowly turn clockwise until you
hear angels singing or the sirens from the cops looking for you. Scan this QR
Code for a video on setting your gains
CROSSOVER-
HP- Sets the crossover to only use the High pass filter
FLAT- Turns off the crossover filters (Warning, only use if you have external passive or active filters,
not using filters can damage your speakers.
LP/BP- Sets the crossover for Low pass filter, can also be used for Bandpass
HIGH - High pass filter, used to set max high-level frequency
LOW- Low pass filter, used to set the minimum low-level frequency
BOOST (LEVEL)- Often called BASS BOOST, increases the 50Hz signal
PWR – Power LED, if it’s on, your good, if its off, you’re not good. See the troubleshooting section if it doesn’t
turn on.
CLIP- Clipping LED, if this is flashing or solid you could damage your speakers, turn down your gain.
PRT- Protect, the amp is in protect mode, see the troubleshooting section for assistance.
Note- The PWR, CLIP, and PRT leds will flash as a test when the amp is first powered on.
REMOTE- Plugin for the external bass knob, used to attenuate the from lowest point to the highest that was
set on the amplifier
WHAT DO ALL THE SWITCHS, KNOBS AND LIGHTS DO?
B00S T
B00ST
CH1 CH2
CH3 CH4
INPUT

SFB SERIES AMPLIFIER OWNER’S MANUAL version 01/21 v2
+12V Battery
You need to connect a power wire to the vehicle’s positive battery terminal. This connection must be tight and
secure to ensure proper connectivity. This wire has to be fused appropriately (see each amplifier’s fuse rating
under specifications) within 12 to 16 inches for safety. You will then need to connect the power wire to the 12+
terminal of the amplifier with a Phillips screw driver. Do not install the fuses until installation is complete.
Ground Connection
It is recommended that you connect your ground directly to your power source ground for the best possible
performance. However, if you cannot, then the ground connection must be made to the vehicle’s chassis and
should be kept as short as possible, while accessing a solid piece of sheet metal in the vehicle. The surface
should be sanded at the contact point to clean rust, paint or grime so a metal-to-metal connection between the
chassis and the termination of the ground wire is effective. You will then need to connect the ground wire to the
GND terminal of the amplifier with a Phillips screw driver.
Remote
The +12V remote turn-on wire is typically controlled by the source unit’s remote turn-on output. The amplifier
will turn on when +12V is present at its remote ( REM ) input and turn off when +12V is switched off. Connect
the remote wire using 12 to 16-gauge wire to the REM connection of the amplifier with Phillips screw driver,
then connect the other end of the remote wire to either the source unit’s turn on output or ignition switch circuit.
The models that have the extra power input will have an extra REM connection noted as OUT, this is intended
to allow you to connect your REM line to other devices if needed.
WARNING
The SFB Line of amplifiers do not come with external fusing.
Make sure you install appropriate in line fusing from the
positive side of your power source.
POWER CONNECTIONS
OUT

SFB SERIES AMPLIFIER OWNER’S MANUAL version 01/21 v2
MONOBLOCK INPUT AND SPEAKER CONNECTIONS
15Hz 1KHz

SFB SERIES AMPLIFIER OWNER’S MANUAL version 01/21 v2
4 CHANNEL FULL RANGE INPUT AND SPEAKER CONNECTIONS

SFB SERIES AMPLIFIER OWNER’S MANUAL version 01/21 v2
Bridge mode examples for Series and Parallel wiring
4 CHANNEL BRIDGE MODE FULL RANGE INPUT AND SPEAKER
CONNECTIONS

SFB SERIES AMPLIFIER OWNER’S MANUAL version 01/21 v2
Bridge mode example using a Dual Voice Coil Subwoofer
4 CHANNEL BRIDGE MODE FULL RANGE INPUT AND SPEAKER
CONNECTIONS

SFB SERIES AMPLIFIER OWNER’S MANUAL version 01/21 v2
5 CHANNEL FULL RANGE INPUT AND SPEAKER CONNECTIONS
CH5
B00ST
B00ST
CH1 CH2
CH3 CH4
INPUT

SFB SERIES AMPLIFIER OWNER’S MANUAL version 01/21 v2
Subwoofer planning
When using more than one subwoofer, you have to make sure your total impedance does not go below the
minimum level of the amp, see the specification charts for your amplifiers minimums. Use the chart below to
help in your design.
Coil Impedance
D
4
D
2
D
1
Number of dual
coil subwoofers
2
4.00
2.00
1.00
3
2.67
1.33
0.67
4
2.00
1.00
0.50
5
1.60
0.80
0.40
6
1.33
0.67
0.33
7
1.14
0.57
0.29
8
1.00
0.50
0.25
Safe for use where the minimum
impedance is 2Ω and up
Safe for use where the minimum
impedance is 1Ω and up
DO NOT USE
Impedance is too low
SERIES/PARALLEL WIRING OF DUAL COIL SUBWOOFERS

SFB SERIES AMPLIFIER OWNER’S MANUAL version 01/21 v2
PARALLEL WIRING OF DUAL COIL SUBWOOFERS
SERIES WIRING OF DUAL COIL SUBWOOFERS

SFB SERIES AMPLIFIER OWNER’S MANUAL version 01/21 v2
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. Your warranty covers defects in materials and/or workmanship
ONLY and is not an insurance policy. The warranty only covers the original owner of the amplifier.
All warranty returns must be accompanied by the original sales invoice or receipt. You must contact us to
request an RMA number prior to sending any returns via the RMA request form on our web-site. During the
RMA number process, we will generate a pre-paid FedEx label for your return. If your amplifier is covered
under warranty shipping both ways will be at no cost to you – if your amplifier is replaced/repaired outside of
warranty or if no defect is found and your product must be return to you shipping both ways will be billed to
you.
At the sole discretion of Sundown Audio your amplifier will be either repaired or replaced when it is being
covered under warranty. In the event of shipping damage due to improper packaging on products being
returned to Sundown Audio 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 “discounted replacement” policy on all of our amplifiers. 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 for a full 5-years from your purchase date. Contact us via our RMA form to
take advantage of this offer. This offer applies only to the original purchaser of the unit and is not transferable.
As is the case with standard warranty claims the return must be sent with a copy of the original invoice or
receipt.
In no event will Sundown Audio be liable for incidental, consequential, or other damages resulting from the use
of this product, this includes but is not limited to, damage of hearing, property or person, damage based upon
inconvenience or on loss of use of the product, and to the extent permitted by law, damages for personal
injury. This warranty gives you specific legal rights, and you may have other rights, which vary from state to
state. This warranty applies only to products sold and used in the United States of America. In all other
countries please contact your local distributor.
WARRANTY

SFB SERIES AMPLIFIER OWNER’S MANUAL version 01/21 v2
All Sundown Audio amplifiers have multi-layer protection features to prevent damage from misuse or faulty
conditions to ensure long lasting life of your investment. If the unit senses excessive heat, short circuited
speakers, overload, or voltage fluctuation outside of the working range the protection indicator light will turn red
and the unit will turn off. In order to solve this problem, you should turn all levels down, power off the unit, then
carefully check the installation for wiring mistakes or shorts. If the amplifier is excessively warm the protection
light will not turn on as the unit will turn off to protect itself from overheating. Let the unit cool down for 30
minutes and try again. If the unit works, try moving the amplifier or make sure nothing is covering it so it can
vent heat off of the heatsink. Before you remove or uninstall the amplifier, refer to the list below for suggested
solutions.
Amplifier Doesn’t Turn On or No Output
 Check the fuse(s), not just visually, but with a continuity meter and all 12+ volt, remote and ground
connection. Make sure you have 13+ volts. It is possible for a fuse to have poor internal connections,
take the fuse out of the holder for the testing.
 Check the input signal from the source unit using an AC voltmeter to measure the voltage while it’s
being played. The voltage should be from 0.2 to 6.0 volts from the RCA cables.
 Check the output of the amplifier, test for output at the speaker outputs of the amplifier.
 Check to ensure that the speaker wires are making a good connection to the amplifier and the
subwoofers.
Amplifier Goes Into Protection
 Check shorts on speaker wires or open coil.
 Check input voltage from RCA, if DC signal is over 4 volts, the amplifier will go into protect. Remove
and reset the power to the unit to check if it will turn on.
 Check impedance to make sure it’s over the minimum load, see the specification charts in this manual
for the minimums of your specific amp.
 Check input voltage. The amplifiers covered in this manual have a working range of 10.5 to 15.5 volts.
 Check chassis ground and remote using same ground.
Distorted / Attenuated / Noise Sound
 Check the chassis ground connections of all audio equipment.
 Check amplifier controls for errors, input level or crossover setting.
 Check the speaker wires for a possible short, either between the positive and negative leads or
between a speaker lead and the vehicle’s chassis ground.
 Check the nominal load impedance to verify that the amplifier is driving a load equal to or greater than
the specified minimums, see the specification charts in this manual for the minimums of your specific
amp.
 Check the input signal and input signal cables to make sure signal is present at the amplifier inputs and
the cables are not pinched or loose. It may be helpful to try a different set of cables and / or a different
signal source to be sure.
 Check speaker wiring for reverse polarity.
 If you hear a pulsing sound from your speakers, it means that there is something being overdriven.
This could be due to a gain being set too high or a speaker impedance being too low, see the
specification charts in this manual for the minimums of your specific amp.
TROUBLESHOOTING

SFB SERIES AMPLIFIER OWNER’S MANUAL version 01/21 v2
514 W 21st Street, Newton, NC 28658
[phone]
Find us on:
WWW.SUNDOWNAUDIO.COM