Sundown SFB-500.4 v.2 4-Channel Amplifier
Four-channel Class D amplifier stable down to 1 ohm
$389.99
Overview
The Sundown SFB-500.4 v.2 is a four-channel full-range Class D amplifier rated 500 watts × 4 at 1 ohm, 300 watts × 4 at 2 ohms, and 200 watts × 4 at 4 ohms RMS. Each channel is 1-ohm stable for multi-speaker or separates builds. Variable 12 dB high-pass and low-pass filters plus a 12 dB bass boost at 50 Hz help set midrange and bass. Thermal, voltage, speaker-short, and DC-offset protection are built in. A wired remote with a clipping indicator is optional and sold separately. Professional installation recommended.
Product details
Four-channel full-range power
The SFB-500.4 v.2 is Sundown’s four-channel model in the full-bridge SFB line. Official RMS ratings at 14.4 volts are 500 watts × 4 at 1 ohm, 300 watts × 4 at 2 ohms, and 200 watts × 4 at 4 ohms. That 1-ohm-per-channel stability is intended for mid/high arrays, marine systems, or a full set of separates from a single amplifier.
Crossovers and bass boost
A variable 12 dB/octave low-pass filter covers 50 Hz to 6 kHz, and a variable 12 dB/octave high-pass filter covers 15 Hz to 6 kHz. Bass boost is variable up to 12 dB at 50 Hz. Input sensitivity is 5 V maximum, and the official signal-to-noise figure is 100 dB. Power, protection, and clipping indicators are included on the amplifier.
Protection, chassis, and installation
Protection circuitry covers thermal events, voltage faults, speaker shorts, and DC offset. Official working voltage is 10.5–15.5 V DC, and the recommended fuse rating is 180 A. The official owner’s manual lists chassis size as 8.86 inches wide, 8.66 inches long, and 2.70 inches high (225 × 220 × 68.5 mm). Size power wire and fusing for the full system load; the wiring kit is sold separately.
Optional remote
A wired remote with a clipping indicator is available as an optional accessory and is not confirmed as an included item with this amplifier. Plan the install around professional wiring, proper impedance, and adequate ventilation around the compact chassis.
Key features
- Four-channel full-range Class D amplifier, 1 ohm stable per channel
- 500 watts × 4 at 1 ohm RMS, tested at 14.4 volts
- 300 watts × 4 at 2 ohms RMS and 200 watts × 4 at 4 ohms RMS
- Variable 12 dB low-pass filter from 50 Hz to 6 kHz
- Variable 12 dB high-pass filter from 15 Hz to 6 kHz
- Variable 12 dB bass boost at 50 Hz
- Thermal, voltage, speaker-short, and DC-offset protection circuitry
- Optional wired remote with clipping indicator, sold separately
Specifications
| Weight | 15 lbs |
|---|---|
| Dimensions | 8.66 × 8.86 × 2.7 in |
| Brand | Sundown |
| Model | SFB-500.4 v.2 |
| SKU | ASFBV25004 |
| UPC | 810111132947 |
| Product type | 4-channel amplifier |
| Channels | 4 channel |
| Class | D (full bridge) |
| RMS @ 1 Ω | 500×4 W |
| RMS @ 2 Ω | 300×4 W |
| RMS @ 4 Ω | 200×4 W |
| Fuse rating | 180 A |
| Working voltage | 10.5–15.5 V |
| Dimensions | 8.86 W × 8.66 L × 2.70 H in |
| Remote | Optional wired with clipping indicator |
| Channels | 4 channel |
Important notes
- Size power wire and fusing for the full system load (recommended fuse 180 A; wiring kit sold separately).
- Confirm speaker impedance before bridging or wiring several speakers on one channel.
- The wired remote with clipping indicator is optional and sold separately.
- Professional installation is recommended for multi-channel systems.
What's in the box
- Sundown SFB-500.4 v.2 4-channel amplifier
