{"product_id":"b2-audio-ref-sq-3-fullrange-50w-rms-4-ohm-midrange-speaker-pair-b2-refsq3","title":"B2 Audio Pair of REF SQ 3\" Midrange 50 Watt RMS 4-Ohm Speakers","description":"\u003cul\u003e\n\u003cli\u003eReference-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.\u003c\/li\u003e\n\u003cli\u003eCarbon Fiber Cone \u0026amp; Neodymium Motor: Multi-layered hexagonal carbon fiber cone and dust cap paired with a neodymium motor deliver low distortion, fast transients, and excellent detail.\u003c\/li\u003e\n\u003cli\u003eEngineered for Low Compression \u0026amp; 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.\u003c\/li\u003e\n\u003cli\u003eReal 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.\u003c\/li\u003e\n\u003cli\u003eInstall-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.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cbr\u003e\u003cbr\u003e\u003cp\u003e\u003cstrong\u003eB2 Audio Pair of REF SQ 3\" Midrange 50 Watt RMS 4-Ohm Speakers\u003c\/strong\u003e\u003c\/p\u003e\u003cbr\u003e\n\u003cp\u003e\u003cstrong\u003eThis Listing Includes\u003c\/strong\u003e\u003c\/p\u003e\u003cbr\u003e\n\u003cul\u003e\n\u003cbr\u003e\n  \u003cli\u003e(2) 3\" Midrange Speakers B2-REFSQ3\u003c\/li\u003e\n\u003cbr\u003e\n  \u003cli\u003e(1) Mounting hardware\u003c\/li\u003e\n\u003cbr\u003e\n\u003c\/ul\u003e\u003cbr\u003e\n\u003cp\u003e\u003cstrong\u003eSpecifications:\u003c\/strong\u003e\u003c\/p\u003e\u003cbr\u003e\n\u003cp\u003eElectrical Data:\u003c\/p\u003e\u003cbr\u003e\n\u003cul\u003e\n\u003cbr\u003e\n  \u003cli\u003eNominal Impedance (Zn): 4 Ohms\u003c\/li\u003e\n\u003cbr\u003e\n  \u003cli\u003eDC Resistance (Re): 3.35 Ohms\u003c\/li\u003e\n\u003cbr\u003e\n  \u003cli\u003eMaximum Impedance (Zo): 52.653 Ohms\u003c\/li\u003e\n\u003cbr\u003e\n  \u003cli\u003eMinimum Impedance (Zmin): 3.974 Ohms\u003c\/li\u003e\n\u003cbr\u003e\n  \u003cli\u003eMinimum Frequency (Fmin): 752.841 Hz\u003c\/li\u003e\n\u003cbr\u003e\n  \u003cli\u003eVoice Coil Inductance @ 1 kHz (Le): 0.151 mH\u003c\/li\u003e\n\u003cbr\u003e\n\u003c\/ul\u003e\u003cbr\u003e\n\u003cp\u003eT-S Parameters:\u003c\/p\u003e\u003cbr\u003e\n\u003cul\u003e\n\u003cbr\u003e\n  \u003cli\u003eResonance Frequency (Fs): 131.816 Hz\u003c\/li\u003e\n\u003cbr\u003e\n  \u003cli\u003eMechanical Q Factor (Qms): 5.575\u003c\/li\u003e\n\u003cbr\u003e\n  \u003cli\u003eElectrical Q Factor (Qes): 0.379\u003c\/li\u003e\n\u003cbr\u003e\n  \u003cli\u003eTotal Q Factor (Qts): 0.355\u003c\/li\u003e\n\u003cbr\u003e\n  \u003cli\u003eForce Factor (BL): 5.392 Tm\u003c\/li\u003e\n\u003cbr\u003e\n  \u003cli\u003eMechanical Resistance (Rms): 0.590 Ns\/m\u003c\/li\u003e\n\u003cbr\u003e\n  \u003cli\u003eMoving Mass without Air Load (Mmd): 3.874 g\u003c\/li\u003e\n\u003cbr\u003e\n  \u003cli\u003eMoving Mass with Air Load (Mms): 3.970 g\u003c\/li\u003e\n\u003cbr\u003e\n  \u003cli\u003eSuspension Compliance (Cms): 0.367 mm\/N\u003c\/li\u003e\n\u003cbr\u003e\n  \u003cli\u003eEffective Piston Area (Sd): 30.190 cm\u003c\/li\u003e\n\u003cbr\u003e\n  \u003cli\u003eEquivalent Volume (Vas): 0.475 L\u003c\/li\u003e\n\u003cbr\u003e\n  \u003cli\u003eReference Efficiency (No): 0.278 %\u003c\/li\u003e\n\u003cbr\u003e\n  \u003cli\u003eFrequency Response (–3 dB, free air): 200 - 20,000 Hz\u003c\/li\u003e\n\u003cbr\u003e\n  \u003cli\u003eSensitivity @ 1W\/1M (3 dB): 88 dB\u003c\/li\u003e\n\u003cbr\u003e\n\u003c\/ul\u003e\u003cbr\u003e\n\u003cp\u003eMechanical Data:\u003c\/p\u003e\u003cbr\u003e\n\u003cul\u003e\n\u003cbr\u003e\n  \u003cli\u003eVoice Coil Diameter (Id): 1.2\" \/ 30.5 mm\u003c\/li\u003e\n\u003cbr\u003e\n  \u003cli\u003eVoice Coil Former (VCfm): TIL\u003c\/li\u003e\n\u003cbr\u003e\n  \u003cli\u003eVoice Coil Wire: Copper\u003c\/li\u003e\n\u003cbr\u003e\n  \u003cli\u003eVoice Coil Winding Length (h): 7 mm\u003c\/li\u003e\n\u003cbr\u003e\n  \u003cli\u003eVoice Coil Layers (n): 2\u003c\/li\u003e\n\u003cbr\u003e\n  \u003cli\u003eMagnetic Material: Neodymium\u003c\/li\u003e\n\u003cbr\u003e\n  \u003cli\u003eMagnet Diameter (Sm): 60 mm\u003c\/li\u003e\n\u003cbr\u003e\n  \u003cli\u003eMagnet Weight (MW): 4 oz\u003c\/li\u003e\n\u003cbr\u003e\n  \u003cli\u003eMagnetic Gap Height (HE): 4 mm\u003c\/li\u003e\n\u003cbr\u003e\n  \u003cli\u003eLinear Excursion (P-P): 3 mm\u003c\/li\u003e\n\u003cbr\u003e\n  \u003cli\u003eMax Mechanical Excursion (P-P): 6.5 mm\u003c\/li\u003e\n\u003cbr\u003e\n  \u003cli\u003eUnit Weight (UW): 450 g\u003c\/li\u003e\n\u003cbr\u003e\n\u003c\/ul\u003e\u003cbr\u003e\n\u003cp\u003ePower Handling:\u003c\/p\u003e\u003cbr\u003e\n\u003cul\u003e\n\u003cbr\u003e\n  \u003cli\u003e100 h RMS Noise Test (IEC-18-4): 50 watts\u003c\/li\u003e\n\u003cbr\u003e\n  \u003cli\u003eLong Term Max Power (IEC-18-2): 100 watts\u003c\/li\u003e\n\u003cbr\u003e\n  \u003cli\u003eRecommended High-Pass 2nd order HP Butterworth (IEC-268-5): @ 200 Hz\u003c\/li\u003e\n\u003cbr\u003e\n\u003c\/ul\u003e\u003cbr\u003e\n\u003cp\u003e\u003cstrong\u003eDimensions:\u003c\/strong\u003e\u003c\/p\u003e\u003cbr\u003e\n\u003cul\u003e\n\u003cbr\u003e\n  \u003cli\u003eOverall Diameter (OD): 3.62\" \/ 92 mm\u003c\/li\u003e\n\u003cbr\u003e\n  \u003cli\u003eCutout Diameter (CD): 3.02\" \/ 76.8 mm\u003c\/li\u003e\n\u003cbr\u003e\n  \u003cli\u003eTotal Depth (TD): 2.11\" \/ 53.6 mm\u003c\/li\u003e\n\u003cbr\u003e\n  \u003cli\u003eMounting Depth (MD): 1.52\" \/ 38.6 mm\u003c\/li\u003e\n\u003cbr\u003e\n\u003c\/ul\u003e","brand":"B2 Audio","offers":[{"title":"Default Title","offer_id":48033945485560,"sku":"B2-REFSQ3","price":199.95,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0029\/9384\/8365\/files\/028b040e8ee8f7289d0819aeb1b67c70ee0c28f3858443d99f667cb8b21dcb74.jpg?v=1772460969","url":"https:\/\/bigjeffaudio.com\/products\/b2-audio-ref-sq-3-fullrange-50w-rms-4-ohm-midrange-speaker-pair-b2-refsq3","provider":"Big Jeff Online Inc","version":"1.0","type":"link"}