JBL Stage GT 50011 500W Mono Class-D Subwoofer Amplifier

The JBL Stage GT 50011 500W Mono Class-D Subwoofer Amplifier delivers 300W RMS at 4 ohms and 500W RMS at 2 ohms — 1,220W peak — in a compact chassis built for tight installs. Class-D efficiency, a parametric bass EQ with adjustable frequency and Q-factor, variable low-pass crossover, variable phase control, speaker-level inputs, start-stop compatibility, and a remote bass control module — this is a feature-rich mono amp at an accessible price point.

The Stage GT 50011 runs in Class-D for maximum thermal efficiency — less heat, smaller chassis, lower current draw, and reliable long-term operation in under-seat or behind-panel installs. Power output is 300W RMS at 4 ohms and 500W RMS at 2 ohms, covering most 10"–12" subwoofers rated in that range. Frequency response spans 10Hz to 320Hz (±1dB) with THD+N at 1% at rated output. The onboard parametric bass EQ is a standout feature at this price — adjustable level (0–12dB), adjustable frequency (30–100Hz), and adjustable Q-factor (Narrow to Wide) let you sculpt your sub's bass character precisely without a separate processor. The variable low-pass filter (32–320Hz) handles subwoofer integration and speaker protection. The variable phase control (0°–180°) — not just a 2-position switch — lets you fine-tune phase alignment between your subwoofer and main speakers for maximum bass output. Both high-level (0.2V–5V) and low-level (1V–25V) inputs are supported for factory or aftermarket integration. Full protection suite covers DCP, OVP, UVP, OCP, and OTP. Operating voltage of 9V–16V ensures start-stop vehicle compatibility. Fuse rating is 30A x2 (60A total).

Pair the Stage GT 50011 with a subwoofer rated 300–500W RMS. Wire a DVC sub to 2 ohms to take full advantage of the 500W RMS output. Use a ported enclosure tuned to 30–35Hz for maximum low-frequency extension, or a sealed enclosure for tighter, more accurate bass. Pairs naturally with JBL Stage3 Series speakers for a matched JBL system.

Why Choose the JBL Stage GT 50011?

• 500W RMS at 2 Ohms: Serious subwoofer power in a compact chassis — enough to drive most 10"–12" subwoofers to their rated RMS.
• Parametric Bass EQ (Level + Frequency + Q-Factor): Adjustable level, frequency, and bandwidth — sculpt your sub's bass character precisely without a separate processor.
• Variable Phase Control (0°–180°): Continuously variable phase — not just a 2-position switch — for precise phase alignment between sub and main speakers.
• Class-D Efficiency: Maximum power output with minimum heat generation — compact chassis, lower current draw, reliable long-term operation.
• Variable Low-Pass Filter (32–320Hz): Full subwoofer integration control — set your crossover point precisely without a separate processor.
• Speaker-Level Inputs: Connects directly to factory head unit speaker outputs — no line output converter required.
• Start-Stop Vehicle Compatible: 9V–16V operating range handles the voltage fluctuations of modern start-stop electrical systems.
• Remote Bass Control Included: Keep subwoofer level control at your fingertips from the driver's seat.

Wiring & System Recommendations

Use 4-gauge power and ground wire — fuse within 18 inches of the battery at 60A total (30A x2). For maximum output, wire a DVC subwoofer to 2 ohms and run the amp at 500W RMS. Set the low-pass crossover at 80Hz and use the parametric bass EQ to add 3–6dB of boost at 40–50Hz for ported enclosures — start conservative and increase to taste. Set the subsonic filter (if available on your head unit or DSP) at 25Hz for ported enclosures to protect the subwoofer from infrasonic content. Use 8 AWG or heavier speaker wire from amp to subwoofer. Pairs naturally with JBL Stage3 Series speakers for a fully matched JBL system.

Full Specifications

Frequently Asked Questions

Q: What subwoofer pairs best with the Stage GT 50011?
A: Any subwoofer rated 300–500W RMS is a strong match. Wire a DVC sub to 2 ohms to take full advantage of the 500W RMS output. Contact us at Trinity Car Audio for a specific subwoofer recommendation based on your enclosure and goals.

Q: Can I use the Stage GT 50011 with my factory head unit?
A: Yes — the high-level inputs (0.2V–5V) connect directly to your factory head unit's speaker outputs without a line output converter. This makes it one of the easiest mono amplifiers to integrate into an OEM system.

Q: What makes the parametric bass EQ better than a standard bass boost?
A: A standard bass boost adds a fixed amount of gain at a fixed frequency. The Stage GT 50011's parametric EQ lets you choose the boost frequency (30–100Hz), the boost level (0–12dB), and the bandwidth (Narrow to Wide Q). This means you can target exactly the frequency your subwoofer and enclosure need a boost at, rather than applying a generic boost that may cause unwanted coloration.

Q: Is the Stage GT 50011 compatible with start-stop vehicles?
A: Yes — the 9V–16V operating voltage range is specifically designed to handle the voltage fluctuations of modern start-stop electrical systems without shutting down or causing noise.