Sundown Audio SFB 1000.4D

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Summary

Digital Monoblock Features and Specifications

Digital Monoblock Specifications

Details technical specifications for digital monoblock amplifiers.

Full Range Digital Features and Specifications

Full Range Digital Specifications

Details technical specifications for full range digital amplifiers.

Amplifier Controls and Indicators

Gain and Level Controls

Details the function of gain and level (bass boost) controls.

Crossover Controls

Explains high pass, low pass, and flat crossover settings.

Power Connections and Safety

Power Connection Diagram

Illustrates how to connect the amplifier's power source.

Battery Connection

Details connecting the +12V battery terminal and fusing.

Ground Connection

Provides guidance for making a proper chassis ground connection.

4 Channel Bridge Mode with DVC Subwoofer

Dual Voice Coil Subwoofer Wiring

Subwoofer Wiring Planning

Subwoofer Impedance Planning

Guidance on planning subwoofer wiring and impedance.

Troubleshooting Common Issues

No Power or Output

Steps to diagnose and fix no power or output issues.

Amplifier Protection Mode

Explains why the amp goes into protection and how to resolve it.

Summary

Digital Monoblock Features and Specifications

Digital Monoblock Specifications

Details technical specifications for digital monoblock amplifiers.

Full Range Digital Features and Specifications

Full Range Digital Specifications

Details technical specifications for full range digital amplifiers.

Amplifier Controls and Indicators

Gain and Level Controls

Details the function of gain and level (bass boost) controls.

Crossover Controls

Explains high pass, low pass, and flat crossover settings.

Power Connections and Safety

Power Connection Diagram

Illustrates how to connect the amplifier's power source.

Battery Connection

Details connecting the +12V battery terminal and fusing.

Ground Connection

Provides guidance for making a proper chassis ground connection.

4 Channel Bridge Mode with DVC Subwoofer

Dual Voice Coil Subwoofer Wiring

Subwoofer Wiring Planning

Subwoofer Impedance Planning

Guidance on planning subwoofer wiring and impedance.

Troubleshooting Common Issues

No Power or Output

Steps to diagnose and fix no power or output issues.

Amplifier Protection Mode

Explains why the amp goes into protection and how to resolve it.

This document is the owner's manual for the SFB Series Amplifiers by Sundown Audio, covering both monoblock and multi-channel models. It provides detailed specifications, wiring diagrams, and troubleshooting information to guide users through installation and operation.

Function Description

The SFB Series Amplifiers are designed to power car audio systems, offering high-efficiency digital amplification for both monoblock (single channel, typically for subwoofers) and multi-channel (for full-range speakers) applications. The amplifiers feature various controls for sound customization, including crossover filters and bass boost, and incorporate protection circuits to ensure reliable operation.

Important Technical Specifications

The manual details specifications for several monoblock and multi-channel amplifier models.

Digital Monoblock Features:

Amplifier Type: Digital Class-D Mono Block Amplifier.
Power Supply: Dual MOS-FET PWM Power Supply.
Load Stability: 1 Ohm Stable Load.
Crossover: 12 dB/Octave - Variable Low Pass Filter.
Bass Boost: 0 to 12dB - Variable Bass Boost.
Protection: 4 Way Protection Circuit (Thermal, Voltage Speaker short, and DC Offset).
Control: Wired Remote Control with Clipping Indicator.

Digital Monoblock Specifications (Tested @14.4Volts):

Model	1Ω Mono RMS	2Ω Mono RMS	4Ω Mono RMS	Recommended Fuse Rating	Low Pass Filter (Variable)	High Pass Filter (Variable)	LEVEL (Bass Boost)	Input Sensitivity	Signal Noise Ratio	Working Voltage	Width (mm)	Length (mm)	Height (mm)	Width (inches)	Length (inches)	Height (inches)
SFB 600D	600W	350W	250W	60A	80Hz - 20kHz	15Hz - 1kHz	0 - 12dB (50Hz)	5V Max	86dB	10.5V - 15.5V DC	185	127	64	7.25	5.00	2.50
SFB 1000D	1000W	850W	500W	100A	80Hz - 20kHz	15Hz - 1kHz	0 - 12dB (50Hz)	5V Max	100dB	10.5V - 15.5V DC	185	147	64	7.25	5.75	2.50
SFB 1500D	1500W	1200W	650W	140A	80Hz - 20kHz	15Hz - 1kHz	0 - 12dB (50Hz)	5V Max	100dB	10.5V - 15.5V DC	185	172	64	7.25	6.75	2.50
SFB 2000D	2000W	1500W	950W	180A	80Hz - 20kHz	15Hz - 1kHz	0 - 12dB (50Hz)	5V Max	100dB	10.5V - 15.5V DC	185	191	64	7.25	7.50	2.50
SFB 3000D	3000W	2000W	1100W	250A	80Hz - 20kHz	15Hz - 1kHz	0 - 12dB (50Hz)	5V Max	86dB	10.5V - 15.5V DC	229	210	64	9.00	8.25	2.50
SFB 5000D	5000W	3200W	2200W	220A x2	80Hz - 20kHz	15Hz - 1kHz	0 - 12dB (50Hz)	5V Max	100dB	10.5V - 15.5V DC	229	293	70	9.00	11.50	2.75
SFB 8000D	8000W	5000W	3250W	350A x2	80Hz - 20kHz	15Hz - 1kHz	0 - 12dB (50Hz)	5V Max	100dB	10.5V - 15.5V DC	229	420	70	9.00	16.50	2.75
SFB 13500D	13500W	8100W	5500W	400A x3	80Hz - 20kHz	15Hz - 1kHz	0 - 12dB (50Hz)	5V Max	100dB	10.5V - 15.5V DC	229	521	70	9.00	20.50	2.75
SIA 3500D	3500W	3000W	1750W	300A	40Hz - 20kHz	10Hz - 1kHz	0 - 12dB (50Hz)	5V Max	108dB	10.5V - 15.5V DC	229	229	70	9.00	9.00	2.75

Full Range Digital Features:

Amplifier Type: High Efficiency Digital Multi-Channel Design.
Crossover: 12dB/Octave-Variable High Pass Filter, 12dB/Octave-Variable Low Pass Filter.
Protection: 4 Way Protection Circuit (Thermal, Voltage Speaker short, and DC Offset).
Control: Clipping Indicator, Optional Wired Remote Control with Clipping Indicator.

Full Range Digital Specifications (Tested @14.4Volts):

Model	1Ω RMS	2Ω RMS	4Ω RMS	Recommended Fuse Rating	Low Pass Filter (Variable)	High Pass Filter (Variable)	LEVEL (Bass Boost)	Input Sensitivity	Signal Noise Ratio	Working Voltage	Width (mm)	Length (mm)	Height (mm)	Width (inches)	Length (inches)	Height (inches)
SFB-200.4D	200W / CH	125W / CH	75W / CH	80A	50Hz - 6kHz	15Hz - 6kHz	0 - 12dB (50Hz)	5V Max	100dB	10.5V - 15.5V DC	185	216	64	7.25	8.50	2.50
SFB-500.4D	500W / CH	300W / CH	200W / CH	180A	50Hz - 6kHz	15Hz - 6kHz	0 - 12dB (50Hz)	5V Max	100dB	10.5V - 15.5V DC	210	248	70	8.25	9.75	2.75
SFB-1000.4D	1000W / CH	550W / CH	325W / CH	350A	50Hz - 6kHz	15Hz - 6kHz	0 - 12dB (50Hz)	5V Max	100dB	10.5V - 15.5V DC	229	293	70	9.00	11.50	2.75
SFB-1800.5D	1Ω NOT SUPPORTED (CH1-4), 1000W (CH5)	300W (CH1-4), 500W (CH5)	200W (CH1-4), 250W (CH5)	150A	50Hz - 6kHz, 50Hz - 20kHz (CH5)	15Hz - 6kHz, 15Hz - 1kHz (CH5)	0 - 12dB (50Hz)	5V Max	100dB	10.5V - 15.5V DC	229	318	70	9.00	12.50	2.75

Usage Features

The manual provides comprehensive guidance on using the amplifier's features:

RCA Inputs (CH1-CH5 RCA's): Used for connecting the RCA signal from the source unit.
Speaker Outputs (CH1-CH5 SPEAKER OUTPUTS): Where speakers are connected, with specific diagrams for assistance.
GAIN Control: This is not a volume knob but is used to set the input signal levels. Users are advised to start from Min and slowly turn clockwise until desired sound quality is achieved, with a QR code provided for a video guide on setting gains.
CROSSOVER Settings:
- HP (High Pass): Sets the crossover to only use the High Pass Filter.
- FLAT: Turns off crossover filters. Warning: only use with external passive or active filters to prevent speaker damage.
- LP/BP (Low Pass/Bandpass): Sets the crossover for the Low Pass Filter, also usable for Bandpass.
- HIGH: High Pass Filter, used to set the maximum 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.
Indicator Lights:
- PWR (Power LED): Indicates the amplifier is on. If off, troubleshooting is required.
- CLIP (Clipping LED): Flashing or solid indicates clipping, which can damage speakers. Gain should be reduced.
- PRT (Protect LED): Indicates the amplifier is in protect mode, requiring troubleshooting.
- Note: PWR, CLIP, and PRT LEDs flash as a test when the amp is first powered on.
REMOTE: Plugin for an external bass knob, used to attenuate the bass from the lowest point to the highest set on the amplifier.
Power Connections: Detailed instructions for connecting the +12V battery, ground, and remote turn-on wires. Emphasizes the importance of appropriate in-line fusing for safety, as SFB Line amplifiers do not come with external fusing.
Speaker Wiring: Diagrams for monoblock input and speaker connections, including options for series/parallel wiring of subwoofers. For multi-channel amplifiers, diagrams for 4-channel full-range input and speaker connections are provided, along with bridge mode examples for series and parallel wiring, and dual voice coil subwoofer wiring. The SFB-1800.5D model includes specific wiring for its 5th channel.
Subwoofer Planning: A chart is provided to help users determine the total impedance when using multiple dual coil subwoofers, ensuring it does not fall below the amplifier's minimum level.

Maintenance Features

The manual provides troubleshooting steps to address common issues:

Amplifier Doesn't Turn On or No Output:
- Check fuses (visually and with a continuity meter), +12V, remote, and ground connections, ensuring 13+ volts.
- Verify input signal from the source unit using an AC voltmeter (0.2 to 6.0 volts from RCA cables).
- Test for output at the amplifier's speaker outputs.
- Ensure good speaker wire connections to the amplifier and subwoofers.
Amplifier Goes Into Protection:
- Check for shorts on speaker wires or open coils.
- Verify input voltage from RCA; if DC signal exceeds 4 volts, the amplifier will protect. Remove and reset power.
- Check impedance to ensure it's above the minimum load specified in the manual.
- Confirm input voltage is within the working range of 10.5 to 15.5 volts.
- Check chassis ground and remote using the same ground point.
Distorted / Attenuated / Noise Sound:
- Check chassis ground connections for all audio equipment.
- Review amplifier controls for errors in input level or crossover settings.
- Inspect speaker wires for possible shorts (between positive/negative leads or a lead and chassis ground).
- Verify nominal load impedance is equal to or greater than specified minimums.
- Ensure input signal and cables are present and not pinched or loose; try different cables or signal sources if needed.
- Check speaker wiring for reverse polarity.
- If a pulsing sound is heard, it indicates overdriving, possibly due to high gain or low speaker impedance. Adjust gain or check impedance against manual specifications.

Warranty Information:

Standard Warranty: 2-Year limited warranty for amplifiers purchased from an authorized Sundown Audio dealer, covering defects in materials and/or workmanship. It does not cover improper installation, accidental damage, misuse, abuse, improper wiring, operation outside specifications, or modifications by unauthorized parties. Requires original sales invoice/receipt and an RMA number. Shipping costs for warranty repairs are covered both ways.
Discounted Replacement Policy: A 5-Year policy offering a new unit at a reduced cost for damage, even if user-caused. This applies to the original purchaser and requires a copy of the original invoice/receipt and an RMA number.
Liability: Sundown Audio is not liable for incidental, consequential, or other damages resulting from product use, including hearing damage, property damage, or personal injury. The warranty applies only to products sold and used in the United States of America; international customers should contact their local distributor.