8" P3S Shallow 4-Ohm DVC Subwoofer 150W RMS, Anodised Aluminium Cone, M-Roll Santoprene Surround, Shallow Motor Assembly. Sealed and Vented Compatible.

Product Overview

The Rockford Fosgate Punch P3SD4-8 is an 8" 4-Ohm Dual Voice Coil (DVC) shallow subwoofer rated at 150W RMS the 4-Ohm variant of the P3S 8" shallow platform. Identical construction to the P3SD2-8 with the sole difference being 4-Ohm voice coil impedance per coil, providing wiring options of 2-Ohm (parallel), 8-Ohm (series), or 4-Ohm per coil for bi-amplification no 1-Ohm stability requirement. Confirmed compatible with both sealed and vented enclosures. Sold as an individual unit.

All confirmed P3S construction applies: anodised aluminium cone and dustcap, M-Roll Santoprene surround, dual linear spider with embedded 16 AWG tinsel leads, StampCast basket with integrated spider venting, shallow motor assembly, and diamond-cut cast aluminium trim ring with grille provision. Full specifications must be confirmed from the official Rockford Fosgate P3SD4-8 datasheet.

Key Specifications

• Subwoofer size: 8 inch (shallow)
• Voice coil configuration: Dual Voice Coil (DVC)
• Impedance: 4-Ohm per coil (2-Ohm parallel / 8-Ohm series / 4-Ohm biamp)
• Power handling (RMS): 150W (confirmed)
• Peak power: Not specified — confirm with Rockford Fosgate
• Motor assembly: Shallow ✓
• Sensitivity: Not specified — confirm with Rockford Fosgate
• Frequency response: Not specified — confirm with Rockford Fosgate
• Xmax: Not specified — confirm with Rockford Fosgate
• Mounting depth: Shallow — exact depth not confirmed
• Cutout diameter: Not specified — confirm with Rockford Fosgate
• Cone: Anodised aluminium ✓
• Dustcap: Anodised aluminium ✓
• Surround: M-Roll Santoprene ✓
• Spider: Dual linear with embedded 16 AWG tinsel leads ✓
• Basket: StampCast with integrated spider venting ✓
• Input terminals: Not specified — confirm with Rockford Fosgate
• Trim ring: Diamond-cut cast aluminium (grille insert compatible) ✓
• Enclosure compatibility: Sealed and vented ✓
• Sealed enclosure volume: Not specified — confirm with Rockford Fosgate
• Vented enclosure volume: 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

• 4-Ohm DVC — No 1-Ohm Requirement:
  • 2-Ohm (parallel): Compatible with most 2-Ohm mono amplifiers
  • 8-Ohm (series): For amplifiers with higher minimum impedance
  • 4-Ohm per coil (biamp): Each coil to a separate amplifier channel
• 150W RMS — Confirmed — appropriate for the shallow motor's excursion capacity.
• Sealed and Vented Compatible — Both enclosure types confirmed, providing installation flexibility not available in sealed-only shallow subwoofers.
• Anodised Aluminium Cone and Dustcap — Rigid, heat-conducting aluminium cone in the shallow platform format.
• M-Roll Santoprene Surround — Controlled compliance geometry and durable elastomer surround for long-term reliability.
• Dual Linear Spider — Improved suspension control at high excursion in the shallow motor format.
• StampCast Basket with Integrated Spider Venting — Motor cooling during sustained operation.
• Diamond-Cut Cast Aluminium Trim Ring — Premium finish with optional grille provision.

Technical Specs

Compatible With / Goes Well With

Suitable enclosure types:

• Sealed and vented — both confirmed

Wiring:

• 2-Ohm → parallel
• 8-Ohm → series
• 4-Ohm per coil → biamp

Pairs well with:

• A mono amplifier rated at 150W RMS at the selected wiring impedance
• A shallow sealed or vented 8" enclosure to Rockford Fosgate's recommended volume

Frequently Asked Questions

What is the difference between P3SD4-8 and P3SD2-8?

Both are identical 8" P3S shallow subwoofers at 150W RMS. The sole difference is impedance: P3SD4-8 is 4-Ohm per coil (2-Ohm parallel / 8-Ohm series), P3SD2-8 is 2-Ohm per coil (1-Ohm parallel / 4-Ohm series). The 4-Ohm variant avoids the 1-Ohm parallel requirement, providing broader amplifier compatibility.

Can the P3SD4-8 be used in a vented enclosure?

Yes — the P3SD4-8 is confirmed compatible with both sealed and vented enclosures. Confirm Rockford Fosgate's recommended enclosure volumes from the official P3SD4-8 datasheet.

What mounting depth does the P3SD4-8 require?

Confirmed shallow, but the exact millimetre figure is absent. Pull from the official Rockford Fosgate P3SD4-8 datasheet before purchasing for any depth-constrained installation.

What amplifier power is appropriate?

150W RMS at the selected wiring impedance. Confirm the amplifier's RMS output at 2-Ohm (parallel) or 4-Ohm before purchasing.

What is the M-Roll Santoprene surround?

M-Roll is the rolled-edge surround profile chosen for the compliance geometry appropriate to a shallow motor. Santoprene is a thermoplastic vulcanizate elastomer with excellent UV resistance and temperature stability. Together they provide durable, controlled cone suspension suited to the P3S shallow platform.