Sundown SFB-1800.5 5-Channel Full-Range Amplifier
Four mid/high channels plus a 1-ohm stable bass channel
$499.99$599.99 (-17%)
Overview
The Sundown SFB-1800.5 is a 5-channel full-range Class D amplifier with four mid/high channels and a dedicated bass channel stable to 1 ohm. Rated ratings include 200×4 + 250×1 @ 4 Ω, 300×4 + 500×1 @ 2 Ω, and 1000×1 @ 1 Ω on channel 5. Variable filters on channels 1–4 and channel 5 support full-system builds.
Product details
Five-channel layout
Channels 1–4 handle speakers while channel 5 is built for a sub. At 4 Ω the amp is rated 200 W × 4 + 250 W × 1; at 2 Ω, 300 W × 4 + 500 W × 1; channel 5 reaches 1000 W RMS at 1 Ω.
Per-band filters
Channels 1–4 offer variable 12 dB LPF 50 Hz–6 kHz and HPF 15 Hz–6 kHz. Channel 5 offers LPF 50 Hz–20 kHz and HPF 50 Hz–1 kHz, plus bass boost at 50 Hz.
System amp in one chassis
Use it for PA-style mid/high arrays, marine systems, or separates plus a powered sub channel. An optional wired remote with clipping indicator is available for bass level control.
Key features
- 5-channel full-range Class D amplifier
- 1000 W × 1 @ 1 Ω RMS (channel 5)
- 300×4 + 500×1 @ 2 Ω RMS
- 200×4 + 250×1 @ 4 Ω RMS
- Variable filters on ch. 1–4 and ch. 5
- Bass boost @ 50 Hz
- Thermal, voltage, short, and DC-offset protection
- Optional wired remote with clipping indicator
Specifications
| Weight | 5.2 lbs |
|---|---|
| Dimensions | 7.25 × 5.75 × 2.5 in |
| Channels | 5 channel |
| Brand | Sundown |
| Model | SFB-1800.5 |
| SKU | SFB18005D |
| UPC | 810111130554 |
| Product type | 5-channel amplifier |
| Channels | 5 channel |
| Class | D (full bridge) |
| RMS @ 4 Ω | 200×4 + 250×1 W |
| RMS @ 2 Ω | 300×4 + 500×1 W |
| RMS ch.5 @ 1 Ω | 1000 W |
| Bass boost | Variable @ 50 Hz |
Important notes
- Size power wire and fusing for the full system load (kit sold separately)
- Make sure speaker and sub impedance before bridging or parallel wiring
- Professional installation recommended for multi-channel systems
What's in the box
- Sundown SFB-1800.5 amplifier
- Mounting hardware as packaged
