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The NVX QB12SPA is a single 12-inch subwoofer already mounted in a slot-ported MDF box with a built-in Class D amplifier, so it is a complete bass package rather than a separate sub, box and amp. It handles 350 watts RMS (1200 peak), plays down to 20 Hz, and includes a remote bass knob plus a pre-installed metal grille. The shallow 6.1-inch depth and speaker-level inputs let it fit behind a truck seat or work off a factory head unit. Against separate-component setups it saves wiring and tuning work but limits you to one 2-ohm driver and its own amplifier.
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This is a single 12-inch ported subwoofer enclosure with a built-in Class D monoblock amplifier. It is rated at 1200 watts peak and 350 watts RMS. A remote bass level controller is included, and a black metal grille comes pre-installed.
The enclosure is a CNC-machined slot-ported box made from 3/4" MDF and covered in black carpet with a black stitched NVX logo. The 12" single voice coil, 2-ohm subwoofer has an injection molded polypropylene cone, a rubber surround and a ferrite magnet motor structure.
The amplifier accepts RCA preamp inputs and speaker-level (high-level) inputs, so it works with both factory and aftermarket audio systems. 8 AWG power and ground wiring is recommended for installation.
