Rockford Fosgate T4652-S Power 6.5" T4 Component System

6.5" T4 Component System LCP Fibre Sandwich Cone, Multi-Pole™ Neodymium Motor, 1" Ring Radiator LCP Tweeter, VAST, Asymmetrical 12dB/Octave Crossover, Bi-Amp Capable.

Product Overview

The Rockford Fosgate Power T4652-S is a 6.5" 2-way audiophile component system from the T4 series described by Rockford Fosgate as a design that mimics the performance of the flagship T5 model. The kit includes two woofers with grilles, two tweeters, a passive crossover, and mounting hardware. Power handling (RMS) is not stated in the supplier data confirm with Rockford Fosgate before publishing.

The T4652-S introduces several construction elements not found in the T3 series: an LCP fibre sandwich woofer cone (layered composite rather than single-material LCP), a Multi-pole™ neodymium motor structure for improved linearity, a FlexFit slot basket, and a 1" ring radiator LCP dome tweeter with an aluminium (not Mylar) phase plug. The asymmetrical 12dB/octave Butterworth crossover provides ±2dB selectable tweeter level settings, bi-amp switching, and on/off-axis configuration. The VAST butyl rubber surround and die-cast aluminium frame are confirmed.

Key Specifications

• Woofer size: 6.5 inch
• Configuration: 2-way component
• Power handling (RMS): Not specified
• Impedance: Not specified — confirm with Rockford Fosgate
• Sensitivity: Not specified — confirm with Rockford Fosgate
• Frequency response: Not specified — confirm with Rockford Fosgate
• Woofer mounting depth: Not specified — confirm with Rockford Fosgate
• Woofer cone: LCP fibre sandwich (layered composite)
• Woofer motor: Multi-pole™ neodymium
• Woofer frame: Die-cast aluminium
• Woofer surround: VAST butyl rubber ✓
• Spider: Fatigue and tear resistant linear Nomex
• Basket: FlexFit slot
• Tweeter: 1" (25mm) ring radiator LCP dome, aluminium phase plug, neodymium (implied)
• Tweeter mounting: DDC (Discrete Dual Clamp) — flush and surface (angled)
• Crossover: External passive, asymmetrical 12dB/octave Butterworth
• Crossover frequencies: Not specified — confirm with Rockford Fosgate
• Tweeter level: Selectable +2dB / 0dB / -2dB ✓
• Bi-amp capability: Yes (selectable)
• On/off-axis: Yes (selectable)
• Grilles: Included ✓
• Mounting hardware: Included ✓
• Kit contents: 2 woofers + 2 tweeters + crossover + grilles + hardware
• CEA-2031 compliant: Not stated — confirm with Rockford Fosgate
• Cutout diameter: Not specified — confirm with Rockford Fosgate
• Weight: Not specified — confirm with Rockford Fosgate
• Warranty: Not specified — confirm with Rockford Fosgate

Features & Benefits

• LCP Fibre Sandwich Cone — A sandwich cone construction bonds multiple layers together — typically a rigid outer skin material and a lightweight core — to produce a cone that is stiffer than a single-material design of equivalent mass. The LCP fibre outer layers provide exceptional stiffness and damping; the sandwich structure adds rigidity in the direction perpendicular to the cone face, reducing cone breakup modes for more accurate midrange reproduction.
• Multi-Pole™ Neodymium Motor Structure — Rockford Fosgate's proprietary Multi-Pole™ motor uses multiple pole pieces in the magnetic circuit rather than the conventional single-pole design — producing a more uniform magnetic field across the voice coil's working range and reducing the nonlinear distortion associated with voice coil position variation in the magnetic gap. This is a proprietary Rockford Fosgate technology.
• 1" Ring Radiator LCP Dome Tweeter with Aluminium Phase Plug — A ring radiator tweeter produces sound from an annular (ring-shaped) diaphragm rather than a full dome face — allowing the centre of the tweeter to be acoustically transparent (via the phase plug). This design produces very even high-frequency dispersion and extended high-frequency response, as the ring geometry allows the diaphragm to move as a more ideal piston at high frequencies. The aluminium phase plug guides high-frequency waves toward the listener while providing thermal management.
• FlexFit Slot Basket — The slot-type FlexFit basket incorporates openings in the basket wall that allow air movement and facilitate OEM mounting in cavities where a solid basket wall would obstruct the door structure. A different construction approach from the standard FlexFit basket.
• VAST Butyl Rubber Surround — VAST geometry confirmed with butyl rubber surround material — providing the increased effective cone area of VAST with the UV resistance and temperature stability of butyl rubber.
• Die-Cast Aluminium Frame — Dense, dimensionally precise die-cast aluminium basket for rigid driver geometry and reduced resonance.
• Fatigue-Resistant Linear Nomex Spider — Aromatic polyamide spider for consistent compliance and fatigue resistance at sustained high-power levels.
• Asymmetrical 12dB/Octave Butterworth Crossover — The Butterworth alignment produces a maximally flat frequency response through the crossover region. The asymmetrical description indicates the slopes or filter characteristics differ between the woofer and tweeter channels — exact crossover frequencies and the nature of the asymmetry are not confirmed in the supplier data.
• ±2dB Tweeter Level, Bi-Amp, On/Off-Axis — The same installer-friendly crossover flexibility as the T3 series: ±2dB tweeter attenuation, bi-amp capability, and on/off-axis optimisation for different tweeter mounting positions.

Technical Specs

Compatible With / Goes Well With

Suitable installation:

• 6.5" front door speaker positions — premium audiophile front stage builds
• Kick panel or A-pillar tweeter positions (on/off-axis optimised)
• Bi-amp configurations with dedicated woofer and tweeter channels

Pairs well with:

• Rockford Fosgate T-series 4-channel amplifiers for passive operation
• Dedicated amplifier channels for bi-amp front stage configuration
• Rockford Fosgate T-series subwoofer amplifier and subwoofer for full system

Frequently Asked Questions

What is an LCP fibre sandwich cone?

A sandwich cone construction bonds multiple material layers — in this case, LCP (Liquid Crystal Polymer) fibre forming the outer skins with a core material between them. LCP fibre provides exceptional stiffness and low mass; the sandwich geometry adds rigidity perpendicular to the cone face, which resists cone breakup (the deformation that causes distortion at high output levels and high frequencies) more effectively than a single-material cone.

What is the Multi-Pole™ neodymium motor?

Multi-Pole™ is Rockford Fosgate's proprietary motor structure that uses multiple pole pieces in the magnetic circuit. This produces a more uniform magnetic field across the voice coil's working excursion range — reducing the position-dependent distortion (inductance variation) that occurs in conventional single-pole motor designs. The result is lower harmonic and intermodulation distortion throughout the driver's operating range.

What is a ring radiator tweeter?

A ring radiator produces sound from an annular (ring-shaped) diaphragm rather than from the full surface of a conventional dome. The centre of the tweeter is occupied by the phase plug rather than driven diaphragm material. This design produces a more even and extended high-frequency dispersion pattern, as the ring geometry allows the diaphragm to behave more like an ideal piston at high frequencies without the cone breakup modes that affect large dome areas. The aluminium phase plug guides the high-frequency output toward the listener.

What is the crossover configuration on the T4652-S?

An asymmetrical 12dB/octave Butterworth crossover. The Butterworth alignment produces maximally flat frequency response through the crossover region. The asymmetrical description indicates the filter characteristics differ between the woofer and tweeter channels — exact crossover frequencies and the specific nature of the asymmetry must be confirmed from the official Rockford Fosgate T4652-S datasheet.

What power handling does the T4652-S have?

Power handling (RMS) is not stated in the supplier data for the T4652-S. This is a critical purchasing specification — confirm with Rockford Fosgate or from the official T4652-S datasheet before purchasing to ensure amplifier compatibility.