The JBL Stage GT 80021 is a compact, high-efficiency 2-channel Class-D amplifier engineered to deliver maximum power with a minimal footprint. Built for easy integration into modern vehicles, its slim design allows it to fit under seats or inside tight panels without sacrificing audio performance.
By utilizing advanced Class-D circuitry, the amplifier converts electrical energy into raw power with very little heat dissipation. This means it draws less current from your vehicle's charging system while providing a clean, continuous output. It is highly versatile, allowing you to drive a pair of full-range door speakers or bridge the channels together to run a single car subwoofer. It also features built-in smart integration technology to connect seamlessly with both factory car radios and aftermarket stereos.
Technical Specifications
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Peak Power Output: 800 Watts Maximum
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RMS Power Output (4 Ohms): 80 Watts x 2 channels
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RMS Power Output (2 Ohms): 130 Watts x 2 channels
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Bridged Power Output (4 Ohms): 260 Watts x 1 channel
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Minimum Speaker Impedance: 2 Ohms unbridged, 4 Ohms bridged
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Total Harmonic Distortion (THD+N): 1% at rated power
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Frequency Response: 20Hz to 20kHz (±1dB)
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Operating Voltage: 9 Volts to 16 Volts DC
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Onboard Fusing: 1 x 25-Amp ATC/ATO fuse
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Maximum Power/Ground Wire Input Size: 10 AWG terminals
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Physical Dimensions: 156.9mm x 49.5mm x 132.5mm (approx. 6.18" x 1.95" x 5.22")
Audio Controls & Signal Tuning
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Input Sensitivity Range (Low-Level / RCA): 0.2 Volts to 5 Volts
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Input Sensitivity Range (High-Level / Speaker Wire): 1 Volt to 25 Volts
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Crossover Selector Switch: Three positions — Low-Pass Filter (LPF), High-Pass Filter (HPF), and Full Range (AP)
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Variable Crossover Frequency: Adjustable dial from 32Hz to 320Hz
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Adjustable Bass Boost EQ: 0 to +12dB variable boost centered at 45Hz
Advanced Integration & Safety Features
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OEM Load Detect Compatibility: Built-in smart circuitry mimics a physical factory speaker load. This prevents factory car radios from muting or throwing an audio error code when you tap into the speaker wires for an upgrade.
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Start/Stop Engine Compatibility: Designed to tolerate sudden drops in electrical current. The amplifier stays powered on and playing without clicking or cutting out when your vehicle cuts the engine at a red light.
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Five-Way Multi-Protection Circuitry:
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DCP: Deep Circuit Protection against internal short-circuits.
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OVP: Over-Voltage Protection to guard against electrical spikes.
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UVP: Under-Voltage Protection to prevent performance failure during low battery conditions.
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OCP: Over-Current Protection against speaker voice-coil issues.
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OTP: Over-Temperature Thermal Protection to safely shut down the amp if it overheats.
Original Factory Box Contents
If you have a brand-new retail package, it should contain:
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(1) JBL Stage GT 80021 Amplifier
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(1) High-level speaker input wire harness with Molex plug
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(2) Spare 25-Amp fuses
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(4) Metal mounting screws with washers
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(2) Allen adjustment keys
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(2) JBL brand stickers
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(1) Instruction manual and safety documentation sheet
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