Rockford Fosgate P1S4-15 Punch 15" P1 4-Ohm SVC Subwoofer

15" 4-Ohm SVC Punch Subwoofer 250W RMS, Kevlar Fibre-Reinforced Paper Cone, VAST, Nomex® Voice Coil Collar, Extended Pole Piece, 10-AWG Nickel Push Terminals.

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Product Overview

The Rockford Fosgate Punch P1S4-15 is a 15" 4-Ohm Single Voice Coil (SVC) subwoofer rated at 250W RMS the 4-Ohm variant of the 15" Punch P1 platform. Identical construction to the P1S2-15 with the sole difference being the 4-Ohm voice coil impedance, providing broader amplifier compatibility. Optimised for sealed and vented enclosures. Sold as an individual unit.

All confirmed Punch P1 construction applies: Kevlar fibre-reinforced paper cone, VAST surround (up to 25% increased cone area), high-temperature voice coil with spun-laced Nomex® reinforcement collar, extended pole piece with bumped vented backplate, StampCast basket with integrated spider venting, 10-AWG nickel-plated push terminals, rubberized ABS trim ring with grille insert provision, and protective PVC textured magnet cover.

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Key Specifications

• Subwoofer size: 15 inch
• Voice coil configuration: Single Voice Coil (SVC)
• Impedance: 4-Ohm
• Power handling (RMS): 250W (confirmed)
• Peak power: Not specified — confirm with Rockford Fosgate
• Surround technique: VAST (up to 25% increased cone area)
• Sensitivity: Not specified — confirm with Rockford Fosgate
• Frequency response: Not specified — confirm with Rockford Fosgate
• Xmax: Not specified — confirm with Rockford Fosgate
• Voice coil: High-temp, Nomex® reinforcement collar
• Cone: Kevlar fibre-reinforced paper
• Spider: Linear with embedded 16 AWG tinsel leads
• Basket: StampCast with integrated spider venting
• Pole piece: Extended
• Backplate: Bumped and vented
• Input terminals: 10-AWG nickel-plated push terminals
• Trim ring: Rubberized ABS (grille insert compatible)
• Magnet cover: Protective PVC textured
• Enclosure compatibility: Sealed and vented ✓
• Mounting depth: Not specified — confirm with Rockford Fosgate
• Cutout diameter: Not specified — confirm with Rockford Fosgate
• Sold as: Individual unit
• Weight: Not specified — confirm with Rockford Fosgate
• Warranty: Not specified — confirm with Rockford Fosgate

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Features & Benefits

• 4-Ohm SVC — Broad Amplifier Compatibility — A 4-Ohm SVC is compatible with most mono subwoofer amplifiers. Two P1S4-15 units in parallel = 2-Ohm; in series = 8-Ohm.
• 15" Cone — Maximum air movement in the P1 range for the greatest bass output and lowest frequency extension — suited to high-output and high-volume installations with sufficient enclosure space.
• 250W RMS — Confirmed 250W RMS sustained power handling.
• Kevlar Fibre-Reinforced Paper Cone — Kevlar reinforcement for improved stiffness and breakup resistance at high output.
• VAST — Up to 25% increased effective cone area.
• Nomex® Voice Coil Reinforcement Collar — Thermal and mechanical reinforcement at the voice coil-to-cone junction.
• Extended Pole Piece and Bumped Vented Backplate — Extended pole for increased Xmax; vented backplate eliminates air spring compression.
• 10-AWG Nickel-Plated Push Terminals — Heavier gauge for lower contact resistance.
• StampCast Basket with Integrated Spider Venting — Motor cooling during sustained operation.
• Rubberized ABS Trim Ring / Grille Provision / PVC Magnet Cover — Finished installation with optional grille.
• Sealed and Vented Compatible — Both enclosure types confirmed.

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Technical Specs

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Compatible With / Goes Well With

Suitable enclosure types:

• Sealed — tight, accurate bass
• Vented — higher efficiency at tuning frequency

Wiring:

• 4-Ohm SVC — single 4-Ohm load per unit
• Two units in parallel = 2-Ohm; two in series = 8-Ohm

Pairs well with:

• Rockford Fosgate T1000-1BDCP, T1500-1BDCP, or T2500-1BDCP mono amplifiers at 4-Ohm

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Frequently Asked Questions

What is the difference between the P1S4-15 and P1S2-15?

Both are identical 15" Punch P1 subwoofers with the same 250W RMS rating and construction. The only difference is impedance: the P1S4-15 is 4-Ohm SVC, the P1S2-15 is 2-Ohm SVC. The 4-Ohm is more universally compatible with most mono amplifiers; the 2-Ohm suits amplifiers that produce maximum rated output at 2-Ohm.

What enclosure volume is required?

Not confirmed in the supplier data. A 15" driver requires considerably more net internal volume than a 10" or 12" — pull the official Rockford Fosgate P1S4-15 datasheet for sealed and vented volume recommendations before building or selecting an enclosure.

What amplifier power is appropriate?

250W RMS at 4-Ohm. Confirm the amplifier's RMS output at 4-Ohm before purchasing.

Is a grille available?

The rubberized ABS trim ring accommodates an optional grille insert. Confirm the compatible grille part number with Rockford Fosgate.

Does a 15" subwoofer fit in a standard passenger car boot?

A 15" subwoofer and its required enclosure occupy significantly more space than a 10" or 12" installation. It is better suited to vehicles with dedicated boot space, custom enclosure builds, utes, vans, or trucks. Confirm the enclosure dimensions and available installation space before purchasing.