3FR-4Midrange / Midbass Drivers & Full-Range Speakers

GRSFull Range 3" Speaker Driver 4 Ohm

Our 3FR-4 full range 3" replacement speaker is a drop-in replacement for many compact speaker systems, both modern and vintage. Also suitable for use in new designs, this speaker's performance will surpass your expectations in computer and multimedia speakers, soundbars and other home theater applications, and much more.

Product Details

Why pay more? The 3FR-4 is a great replacement driver for the widely-used, 3"-size full range drivers found commonly in home theater systems, table radios, “sound bars”, and multimedia speaker systems, among many other uses. It’s also useful as a replacement for 3" woofers.

A sturdy stamped steel frame with “pincushion”-shaped mounting flange supports a robust ferrite ceramic magnet, and the coated paper cone with foam surround delivers clear sound that you might not expect from a driver this affordable.

Quick Facts

  • Coated paper cone with foam surround for clear sound
  • Pincushion-shape frame with front gasket
  • Economical ferrite magnet assembly
  • Quality GRS construction and 1-year warranty


Product Specifications

Nominal Diameter3"
Power Handling (RMS)10 Watts
Power Handling (max)20 Watts
Impedance4 ohms
Frequency Response135 to 16,000 Hz
Sensitivity81 dB 1W/1m
Voice Coil Diameter0.75"

Thiele-Small Parameters

Resonant Frequency (Fs)135 Hz
DC Resistance (Re)4.00 ohms
Voice Coil Inductance (Le)0.39 mH
Mechanical Q (Qms)4.11
Electromagnetic Q (Qes)1.11
Total Q (Qts)0.88
Compliance Equivalent Volume (Vas)0.03 ft.³
Maximum Linear Excursion (Xmax)2 mm

Materials of Construction

Cone MaterialPaper
Surround MaterialFoam
Basket / Frame MaterialSteel
Magnet MaterialFerrite

Mounting Information

Overall Outside Diameter3.75"
Baffle Cutout Diameter2.82"
# Mounting Holes4

Optimum Cabinet Size (determined using BassBox 6 Pro High Fidelity suggestion)

Sealed Volume0.08 ft.³
Sealed F3131 Hz
Vented Volume0.15 ft.³
Vented F378 Hz