Rockford Fosgate P300-12T Punch 12" 300-Watt Powered Truck Enclosure

Rockford Fosgate P300-12T Punch 12" 300 Watt Powered Truck Enclosure

When your truck cab needs serious bass without sacrificing every centimetre of under-seat space, the P300-12T packs a high-output 12" woofer and 300-watt Class D amplifier into a slim sealed enclosure purpose-built for truck installations.

Product Overview

The P300-12T is Rockford Fosgate's all-in-one powered subwoofer enclosure designed specifically for the dimensional constraints of truck under-seat and behind-seat installations. The slim wedge profile enclosure is precision constructed from 5/8" MDF and houses a 12" proprietary woofer impedance-optimised for the integrated 300-watt Class D amplifier in a closed-loop design, ensuring the driver and amplifier work together as a matched system from the factory. The sealed enclosure delivers tight, accurate bass with a 35-200 Hz frequency response, well suited to the acoustic environment of a truck cabin. Control is handled via an onboard variable Low-Pass crossover (50-200 Hz), a Bass EQ with 0 to +12 dB of onboard boost, and a 0-180 degree phase switch on the amplifier plate, while the included Punch Level Control remote puts bass adjustment in the driver's hand. An intelligent auto turn-on/off circuit with three selectable modes (Remote Trigger, DC Offset Sense, and Audio Sense) eliminates the need for a dedicated remote turn-on wire in OEM installations. Separate RCA and high-level speaker inputs make it compatible with both aftermarket and factory head units. Quick-release input connections allow the enclosure to be disconnected and removed quickly when the cargo area is needed. The heat-activated vinyl finish resists marks and wear in daily use. CEA-2006 (amplifier) and CEA-2031 (woofer) compliant, Klippel verified, with a 1-year warranty.

Features & Benefits

300-Watt Class D Amplifier with Closed-Loop Design: The integrated amplifier is an impedance-matched, closed-loop Class D design tuned specifically for the P300-12T's proprietary 12" woofer, ensuring maximum efficiency and precise driver control at all output levels from within the slim enclosure footprint.

Slim Wedge Enclosure for Truck Applications: The low-profile wedge enclosure is dimensioned to fit under or behind seats in truck applications where vertical clearance is limited, delivering full-size 12" subwoofer performance without occupying the cab's usable space.

Klippel Verified Woofer: The 12" proprietary woofer has been verified through the Klippel certification programme, which measures and corrects non-linear distortion parameters to deliver the best possible transient accuracy and low-frequency output from an optimised, impedance-matched driver.

Sealed Enclosure for Tight, Accurate Bass: The sealed MDF enclosure delivers a controlled, accurate bass response suited to the enclosed acoustic space of a truck cab, with tighter low-frequency transients than a ported design and a frequency response extending down to 35 Hz.

Intelligent Auto Turn-On/Off: Three selectable turn-on modes (Remote Trigger, DC Offset Sense, and Audio Sense) allow the P300-12T to power on automatically in any installation scenario, including factory head units without a dedicated remote output, eliminating additional wiring complexity.

Variable Low-Pass Crossover: Continuously variable from 50 to 200 Hz at 12 dB/octave Butterworth, the onboard crossover integrates cleanly with full-range speakers across virtually any crossover point set by the main system amplifier or head unit.

Onboard Bass EQ: 0 to +12 dB of onboard bass boost corrects for acoustic deficiencies in the vehicle interior and adds presence to the low-frequency output without an external equaliser.

Phase Switch: A 0 to 180 degree phase control allows the subwoofer to be time-aligned with the main speakers acoustically, compensating for physical placement differences in the truck cab for a coherent, integrated bass response.

Included Punch Level Control Remote: The Punch Level Control is included in the box, allowing bass output to be adjusted from the driver's seat in real time without accessing the amplifier plate directly.

Quick-Release Input Connections: Input connections use quick-disconnect fittings, allowing the enclosure to be removed from the vehicle quickly when cargo space is needed, without tools or cable work.

High and Low-Level Inputs: Separate RCA (low-level, 150mV-6V) and speaker-level (high-level, 300mV-12V) inputs via a single RCA pair summed L/R support both aftermarket and OEM head unit installations from the same unit.

Thermal and Over/Under Voltage Protection: Onboard protection monitors both operating temperature and supply voltage, shutting the amplifier down safely before damage occurs under fault conditions.

Precision MDF Enclosure with Vinyl Finish: Constructed from 5/8" Medium Density Fiberboard for optimal acoustic properties, covered with a heat-activated vinyl finish that resists marks and scuffs in daily truck use.

CEA-2006 and CEA-2031 Compliant: Amplifier power ratings conform to CEA-2006 industry standards at 14.4V with 1% or less THD. Woofer power handling conforms to CEA-2031, confirming both ratings are real, tested figures.

Technical Specs

Bass EQ frequency flag: The source data confirms the Bass EQ range as 0 to +12 dB but does not specify a centre frequency. The P500-12P lists this as 45 Hz. Please verify with the supplier whether the P300-12T shares the same 45 Hz centre before publishing.

Goes Well With

The P300-12T is designed as a standalone bass solution and requires no separate subwoofer amplifier or enclosure. For factory head unit installations, the high-level speaker inputs and Audio Sense auto turn-on allow direct connection without additional interface hardware. For aftermarket head unit installations, the RCA input connects directly from the head unit's subwoofer pre-out. To complement the P300-12T with front and rear speaker amplification, the PBR400X4D or R2-300X4 pair naturally via a standard RCA pre-out from the head unit. An 8-gauge power and ground cable run to the battery is required, along with the 2 x 10A ATO fuses included in the box.

Frequently Asked Questions

Is the P300-12T designed specifically for trucks, and will it fit other vehicles?

The P300-12T is purpose-built for truck applications, with a slim wedge profile that fits under or behind seats in truck cabs where clearance is limited. It can physically fit in other vehicles, but Rockford Fosgate's intended application is trucks. For hatchbacks, sedans, and SUVs requiring a larger powered enclosure with a ported design, the P500-12P is the recommended alternative.

Why is a sealed enclosure used in the P300-12T rather than a ported design?

The sealed enclosure is chosen for the truck application because it provides tighter, more controlled bass response suited to the enclosed acoustic environment of a truck cab, and allows the slim wedge profile to be maintained within tight dimensional constraints. A sealed design also offers more forgiving power handling characteristics and gentler roll-off below the tuning frequency compared to a ported enclosure.

Can the P300-12T be connected directly to a factory head unit?

Yes. The high-level speaker inputs accept signal from the factory head unit's speaker outputs directly, and the Audio Sense or DC Offset Sense auto turn-on modes allow the enclosure to power on without a dedicated remote turn-on wire. This makes the P300-12T a direct plug-in upgrade for OEM truck systems without requiring head unit replacement.

What are the three auto turn-on modes, and which should I use?

Remote Trigger mode powers the amplifier on when a 12V signal is received at the remote input terminal, requiring a remote turn-on wire from the head unit. DC Offset Sense mode detects a DC voltage change on the high-level speaker input to trigger turn-on, suitable for OEM systems where the speaker output changes state when the head unit powers on. Audio Sense mode detects an incoming audio signal on the input and triggers turn-on automatically, making it the most universal option for both OEM and aftermarket installations without a dedicated remote output.

What is Klippel Verification, and why does it matter for a powered enclosure?

Klippel is an independent speaker measurement and certification programme that identifies and corrects non-linear distortion parameters in speaker drivers, including suspension non-linearities and motor force variation across the cone's travel range. In a sealed powered enclosure where the driver and amplifier are a matched system, Klippel verification confirms that the woofer's performance envelope has been accurately measured and optimised to deliver clean, low-distortion bass at the rated 300 watts across its operating range.