P1S2/S4-15

The Rockford Fosgate P1S2-15 and P1S4-15 subwoofers from the proven Punch P1 series offer powerful bass reproduction, high reliability, and excellent value for the price. With a diameter of 38 cm (15 inches) and an RMS power handling capacity of 250 watts, these subwoofers are suitable for both compact sealed enclosures and bass-reflex enclosures.

The robust design, featuring a temperature-resistant 50-mm voice coil, a durable diaphragm, and a long-lasting foam surround, enables precise and powerful bass reproduction. A linear suspension with integrated connection wires ensures controlled cone movement. The sturdy steel basket guarantees a reliable mechanical design.

Both models have identical performance specifications but differ in their impedance. The P1S2-15 has a 2-ohm voice coil, while the P1S4-15 is equipped with a 4-ohm voice coil.

Technical Specifications

• Manufacturer: Rockford Fosgate

• Series: Punch P1

• Model: P1S2-15 / P1S4-15

• Product Type: Passive Subwoofer

• Speaker size: 38 cm (15 inches)

• RMS Power Handling: 250 watts

• Maximum Power Handling: 500 watts

• Impedance P1S2-15: 2 ohms

• Impedance P1S4-15: 4 ohms

• Voice coils: 1 x 2 ohms or 1 x 4 ohms (SVC)

• Voice coil diameter: 50 mm (2 inches)

• Voice coil winding height: 28 mm

• Sound pressure level (SPL): approx. 87.5 dB

• Frequency range: 18–250 Hz

• Resonance frequency (Fs): 23 Hz

• Linear diaphragm stroke (Xmax): ±9 mm

• Maximum mechanical stroke: ±27 mm

• Effective membrane area (Sd): 876 cm²

• Diaphragm: Sturdy, torsionally rigid composite diaphragm

• Edge: High-density polyfoam edge

• Centering Spider: Linear spider design with integrated connection strands

• Voice coil former: Aluminum

• Basket material: Steel

• Connection: Speaker terminals on the chassis

• Installation depth: 177 mm

• Installation opening: 353 mm

• Outer diameter: 416 mm
  
  

Thiele-Small parameters

• DC resistance (Re): 1.8 ohms

• Resonance frequency (Fs): 23 Hz

• Total Quality (Qts): 0.55

• Electrical Quality (Qes): 0.80

• Mechanical Quality (Qms): 3.46

• Equivalent volume (Vas): 191.5 liters

• Mass in motion (Mms): 254.9 g

• Force factor (BL): 9.1 N/A

• Effective membrane area (Sd): 876 cm²

• Linear stroke (Xmax): ±9 mm
  
  

Recommended Cases

Enclosed housing:

• Recommended net volume: 44.7 liters

• Lower cutoff frequency (F3): 41 Hz

Bass-reflex enclosure:

• Recommended net volume: 75.3 liters

• Bass reflex port diameter: 100 mm

• Bass reflex tube length: 20 cm

• Port area: approx. 80 cm²

• Tuning frequency (Fb): 34 Hz

• Lower cutoff frequency (F3): 34 Hz
  
  

What's Included

• 1 Rockford Fosgate Punch P1 subwoofer (P1S2-15 or P1S4-15, depending on the selected model)

• 1 x User Manual