The
JBL BassPro SL2 is
a low-profile, powered under-seat car subwoofer system designed to add deep, punchy low-end response to vehicles with limited space. Housed in a rigid, custom-engineered
ABS plastic enclosure, it combines an
8-inch shallow-profile woofer with an efficient
Class D digital amplifier. This self-contained layout allows it to mount directly beneath the front passenger or driver seat of most cars and trucks, delivering high-performance bass without sacrificing valuable trunk or cargo space.
The JBL BassPro SL2 serves as an all-in-one upgrade solution to bolster factory or aftermarket audio networks lacking dedicated lower octave reinforcement:
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Space-Saving Footprint: Measuring under 3 inches in total height, the enclosure slips easily into tight floorboard gaps. The heavy-duty ABS plastic construction protects the internal speaker suspension from under-seat debris and foot traffic.
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Cool, Low-Current Operation: Powered by an integrated Class D amplifier, the system converts energy with minimal heat dissipation. It provides significant acoustic output while putting very little strain on the vehicle’s stock alternator and battery system.
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System Integration Versatility: Equipped with both low-level (RCA) and high-level (speaker wire) inputs, it interfaces cleanly with premium aftermarket head units or basic, untuned factory stereos.
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Intelligent Auto Turn-On: An onboard "Audio Sense" option allows the unit to monitor speaker-level inputs for voltage signals. When it detects audio, it powers on automatically, eliminating the need to fish a dedicated 12V remote turn-on lead through the dashboard.
Technical Description & Specifications
According to the authorized engineering benchmarks published by
JBL and detailed product teardowns on
Crutchfield, the technical specifications comprise:
Power & Amplification
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Amplifier Architecture: Class D Digital
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Power Output: 125 Watts RMS
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Peak Power Capacity: 250 Watts
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Maximum Current Draw: 12A
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Quiescent Current Consumption: <800mA
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Fuse Rating: 15A
Audio Performance & Driver Mechanics
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Woofer Diameter: 8 inches (200mm) proprietary shallow-mount driver
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Cone Material: Polypropylene cone paired with a durable butyl rubber surround
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Frequency Response: 35Hz to 120Hz
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Signal-to-Noise Ratio (SNR): 95 dB
Control & System Fine-Tuning
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Low-Pass Filter Crossover: Continuously variable manually from 50Hz to 120Hz
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Crossover Slope Rate: 12dB per octave
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Bass EQ Boost: Adjustable from 0dB up to +9dB centered at 70Hz
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Phase Alignment Adjustment: 0° to 180° inversion switch
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Input Sensitivity Windows:
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Line-Level (Low-Level): 0.05V to 2V
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Speaker-Level (High-Level): 0.5V to 20V
Physical Dimensions
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Width: 9-7/8 inches (250mm)
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Length: 13-9/16 inches (344mm)
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Height: 2-13/16 inches (71mm)
Included In the Box
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JBL BassPro SL2 active enclosure
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Hardware pack including 4 mounting screws
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Wired JBL GTO-RBC remote bass level controller with dashboard cable
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