Description
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.
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.
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
Features & Benefits
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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.
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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.
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250W RMS — Confirmed 250W RMS sustained power handling.
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Kevlar Fibre-Reinforced Paper Cone — Kevlar reinforcement for improved stiffness and breakup resistance at high output.
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VAST — Up to 25% increased effective cone area.
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Nomex® Voice Coil Reinforcement Collar — Thermal and mechanical reinforcement at the voice coil-to-cone junction.
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Extended Pole Piece and Bumped Vented Backplate — Extended pole for increased Xmax; vented backplate eliminates air spring compression.
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10-AWG Nickel-Plated Push Terminals — Heavier gauge for lower contact resistance.
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StampCast Basket with Integrated Spider Venting — Motor cooling during sustained operation.
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Rubberized ABS Trim Ring / Grille Provision / PVC Magnet Cover — Finished installation with optional grille.
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Sealed and Vented Compatible — Both enclosure types confirmed.
Technical Specs
| Specification |
Detail |
| Brand |
Rockford Fosgate |
| Part Number |
P1S4-15 |
| Series |
Punch P1 |
| Subwoofer Size |
15 inch |
| Voice Coil |
Single Voice Coil (SVC) |
| Impedance |
4-Ohm ✓ |
| Power Handling (RMS) |
250W ✓ |
| Peak Power |
Not specified |
| Surround Technique |
VAST (up to 25% increased cone area) ✓ |
| Sensitivity |
Not specified |
| Frequency Response |
Not specified |
| Xmax |
Not specified |
| Voice Coil |
High-Temp, Nomex® Collar ✓ |
| Cone |
Kevlar Fibre-Reinforced Paper ✓ |
| Spider |
Linear, 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 Type |
Sealed and Vented ✓ |
| Mounting Depth |
Not specified |
| Cutout Diameter |
Not specified |
| Sold As |
Individual Unit |
| Weight |
Not specified |
| Warranty |
Not specified — confirm with Rockford Fosgate |
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
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.
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