B2 Audio Pair of REF SQ 3" Midrange 50 Watt RMS 4-Ohm Speakers

• Reference-Grade 3" Mid: Compact 3" midrange built for reference-level sound quality, ideal for high-end 2-way or 3-way front stages and SQ-focused builds.
• Carbon Fiber Cone & Neodymium Motor: Multi-layered hexagonal carbon fiber cone and dust cap paired with a neodymium motor deliver low distortion, fast transients, and excellent detail.
• Engineered for Low Compression & Noise: Features a non-conductive TIL voice coil former, FEA-optimized motor with copper shorting ring, vented aluminum basket, and vented pole piece with foam for reduced compression and mechanical noise.
• Real Power Handling in a Tiny Package: Rated at 50 watts RMS and 100 watts long-term max power (IEC test based), with 88 dB sensitivity and 200–20,000 Hz free-air response for wideband coverage.
• Install-Friendly 3" Form Factor: Compact dimensions with a 3.62" overall diameter, 3.02" cutout, and only 1.52" mounting depth make it perfect for tight locations, A-pillars, dash pods, or custom builds.

B2 Audio Pair of REF SQ 3" Midrange 50 Watt RMS 4-Ohm Speakers

This Listing Includes

• (2) 3" Midrange Speakers B2-REFSQ3


• (1) Mounting hardware

Specifications:

Electrical Data:

• Nominal Impedance (Zn): 4 Ohms


• DC Resistance (Re): 3.35 Ohms


• Maximum Impedance (Zo): 52.653 Ohms


• Minimum Impedance (Zmin): 3.974 Ohms


• Minimum Frequency (Fmin): 752.841 Hz


• Voice Coil Inductance @ 1 kHz (Le): 0.151 mH

T-S Parameters:

• Resonance Frequency (Fs): 131.816 Hz


• Mechanical Q Factor (Qms): 5.575


• Electrical Q Factor (Qes): 0.379


• Total Q Factor (Qts): 0.355


• Force Factor (BL): 5.392 Tm


• Mechanical Resistance (Rms): 0.590 Ns/m


• Moving Mass without Air Load (Mmd): 3.874 g


• Moving Mass with Air Load (Mms): 3.970 g


• Suspension Compliance (Cms): 0.367 mm/N


• Effective Piston Area (Sd): 30.190 cm


• Equivalent Volume (Vas): 0.475 L


• Reference Efficiency (No): 0.278 %


• Frequency Response (–3 dB, free air): 200 - 20,000 Hz


• Sensitivity @ 1W/1M (3 dB): 88 dB

Mechanical Data:

• Voice Coil Diameter (Id): 1.2" / 30.5 mm


• Voice Coil Former (VCfm): TIL


• Voice Coil Wire: Copper


• Voice Coil Winding Length (h): 7 mm


• Voice Coil Layers (n): 2


• Magnetic Material: Neodymium


• Magnet Diameter (Sm): 60 mm


• Magnet Weight (MW): 4 oz


• Magnetic Gap Height (HE): 4 mm


• Linear Excursion (P-P): 3 mm


• Max Mechanical Excursion (P-P): 6.5 mm


• Unit Weight (UW): 450 g

Power Handling:

• 100 h RMS Noise Test (IEC-18-4): 50 watts


• Long Term Max Power (IEC-18-2): 100 watts


• Recommended High-Pass 2nd order HP Butterworth (IEC-268-5): @ 200 Hz

Dimensions:

• Overall Diameter (OD): 3.62" / 92 mm


• Cutout Diameter (CD): 3.02" / 76.8 mm


• Total Depth (TD): 2.11" / 53.6 mm


• Mounting Depth (MD): 1.52" / 38.6 mm