GRS | Broadband subwoofer

GRS 3FR-4 Full-Range 3" Speaker Driver

Name: GRS 3FR-4 mélysugárzó 3" | HQ AudioParts
Brand: GRS
SKU: 3FR-4
Price: 3390.00 HUF
Availability: InStock

SKU: 3FR-4

76.2 mm 4 Ω

Achieve clear, natural midrange and bass response in compact speaker designs with this full-range driver. Its paper cone and ferrite magnet deliver balanced sound, while the 4-ohm impedance and 0.88 total Q factor suit sealed enclosures.

3 390 Ft

(2 669 Ft + VAT)

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Technical data

Nominal diameter	76.2 mm
Impedance	4 Ω
Sensitivity (SPL at 1 m / 2.83 V)	84 dB
Power tolerance (max)	20 W
Resonance frequency (Fs)	135 Hz

Maximum linear deflection (Xmax)	2 mm
Total Q (Qts)	0.88
Electromagnetic Q (Qes)	1.11
Mechanical Q (Qms)	4.11
DC resistance (Re)	4 Ω
Voice coil inductance (L_e)	0.39 mH
Equivalent volume (Iron)	0.8495 l
Woofer type	VMV D1se MQA Hi-End Audio DAC with Bluetooth 5.0 AptX
Membrane material	Paper
Surround material	Foam
Voice coil diameter	19.05 mm
Magnetic material	Ferrite
Basket / frame material	Steel
Dimensions (mm)	95.3 mm
Diameter of the baffle cutout	71.6 mm
# Mounting holes	4
Depth	42.9 mm
Enclosed volume	0 l
Open volume	0 l
Cutoff frequency (–3 dB)	131 Hz
Cutoff frequency (open, -3 dB)	78 Hz

The GRS 3FR-4 Full-Range 3" Speaker Driver offers a compelling solution for audio enthusiasts seeking natural, uncoloured sound reproduction in space-constrained designs. This 4-ohm driver excels as a broadband subwoofer, delivering clear midrange and articulate bass response that belies its compact dimensions. Its versatility makes it ideal for small bookshelf speakers, desktop audio systems, portable Bluetooth enclosures, or custom DIY projects where a single driver must cover a wide frequency range with coherence and musicality.

Engineered with a paper cone and ferrite magnet assembly, the 3FR-4 produces a balanced, warm tonal character free from harshness. The 76.2mm nominal diameter and 42.9mm mounting depth allow integration into slim cabinets, while the 71.6mm cut-out diameter and four mounting holes ensure straightforward installation. Key technical parameters include a total Q factor (Qts) of 0.88, combining a mechanical Q (Qms) of 4.11 and electrical Q (Qes) of 1.11, which supports use in sealed or ported enclosures. With an SPL of 84dB (1m/2.83V), a DC resistance (Re) of 4 ohms, and a voice coil inductance (Le) of 0.39mH, this driver offers efficient power handling. The maximum linear excursion (Xmax) of 2mm ensures controlled bass output within its operating range.

This full-range driver delivers dependable performance for compact audio projects, combining thoughtful engineering with natural sound quality.