B2 Audio 3" Midrange Speakers REF SQ 50W RMS 4 Ohm Pair

• 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

Accepted Payment Methods at Big Jeff Audio

At Big Jeff Audio, we strive to make your shopping experience as smooth as possible by offering a wide variety of payment options. Below is a complete list of the payment methods we accept:

Credit and Debit Cards

• Visa
• Mastercard
• American Express
• Discover
• Diners Club

Digital Wallets

• Amazon Pay
• Apple Pay
• Meta Pay (formerly Facebook Pay)
• Google Pay
• Shop Pay
• PayPal

International Payment Methods

• Bancontact
• iDEAL

Bank Transfers

• Zelle

Financing Options

We also offer financing options to make purchasing easier. Learn more about our financing options here.

• Klarna
• Affirm
• Sezzle
• Snap
• Acima
• Tiptop

If you have any questions or need assistance with payments, feel free to reach out to us at info@bigjeffaudio.com or call us at 737-BIG-JEFF.

Shipping Options and Delivery Time

Do You Offer Expedited Shipping?

Yes! At checkout, you can select from different shipping options:

• Standard Shipping: Free for orders over $100.
• Expedited Shipping: Available at an additional cost, calculated based on the weight and destination of your order.

How Long Does Delivery Take?

• Handling Time: Most orders are processed and shipped within 1 business day after receiving cleared payment. Occasionally, additional handling time may be required, but we’ll notify you if that’s the case.
• Standard Shipping: Typically takes 3-5 business days, though delivery may be affected by extreme weather or holidays.

What Happens If My Package Is Undeliverable?

If your package is refused or marked undeliverable and returned to us by the carrier, you’ll need to pay the full shipping cost to have the package resent. Alternatively, we can refund your order, minus the cost of shipping.

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