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ZAPCO Mono Class AB Amplifier for High Power Sound
ZAPCO Mono Class AB Amplifier for High Power Sound
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Zapco ST-1B Mono Class AB Amplifier
Serious subwoofer power. Serious sound quality.
The Zapco ST-1B is a mono Class AB amplifier built for one job: delivering clean, distortion-free power to your subwoofer system. No compromises, no current limiting, no shortcuts—just pure Zapco engineering with 40 years of audio heritage backing every watt.
Why the ST-1B?
This isn't a budget amp. The ST-1B is engineered for audiophiles and serious car audio enthusiasts who refuse to sacrifice sound quality for power. Unlike Class D amps that prioritize compact size, the ST-1B uses Class AB topology to deliver superior dynamic range and sonic purity. That means your bass hits harder, stays cleaner, and never sounds compressed—even at full volume.
Key advantages:
- Superior dynamic range – More headroom between quiet passages and peak power without distortion
- Class AB efficiency – Optimized for sound quality over size
- Flexible wiring – Run one 2Ω sub or two 4Ω subs from the same amp
- Full control – Variable gain, bass boost (0–12dB), phase control (0–180°), and subsonic filter
- Professional installation – RCA inputs/outputs, remote control port, and clean integration
Built for Real-World Installs
The ST-1B integrates seamlessly into any car audio system. Pass-through RCA outputs let you daisy-chain additional amps, while the subsonic filter eliminates frequencies below your sub's capability—protecting your equipment and tightening your bass response. The variable low-pass crossover and phase control give you precise tuning for any vehicle acoustics.
Installation-ready features:
- MOSFET power supply for stable, clean power delivery
- Variable input gain control (set to minimum before initial turn-on)
- 0–180° phase adjustment for perfect integration with front speakers
- Subsonic filter to protect your subwoofer and reduce cabin resonance
- Remote control port for convenient gain adjustment from the driver's seat
Specifications
| Spec | Value |
|---|---|
| Type | 1-Channel Class AB Amplifier |
| Power @ 4Ω | 200 watts RMS |
| Power @ 2Ω | 300 watts RMS |
| THD | < 0.2% (extremely clean) |
| Signal-to-Noise Ratio | > 90dB |
| Frequency Response | 15Hz–30KHz ±1dB |
| Input Sensitivity | 0.25V–5V (adjustable) |
| Dimensions (net) | 182(W) × 52(H) × 280(L) mm |
| Dimensions (overall) | 182(W) × 52(H) × 310(L) mm |
Installation Notes
The ST-1B requires adequate ventilation—mounting in the trunk with airflow is ideal. Always use proper power and ground wire sizing (consult the included wire sizing chart based on your installation distance). A fuse or circuit breaker within 18" of the battery is essential for safety.
Wiring flexibility:
- Single 2Ω subwoofer minimum
- Two 4Ω subwoofers minimum each
- RCA or high-level (speaker-level) inputs
SEO Meta Description
Zapco ST-1B mono amplifier: 200W @ 4Ω / 300W @ 2Ω Class AB subwoofer amp. Superior sound quality, variable crossover, phase control & subsonic filter. Professional car audio installation.
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