B2 Audio 3-Way 6.5" REF SQ Series Car Audio Component Speaker System

• ELITE 3-WAY SOUND QUALITY COMPONENT SYSTEM: Premium B2 Audio REFSQ63 Reference Series speaker package featuring 6.5" carbon fiber mid-woofers, 3" full-range midrange drivers, and 1" ceramic dome tweeters engineered for audiophile-grade clarity, staging, and detail.
• ADVANCED CARBON FIBER & CERAMIC DRIVER TECHNOLOGY: Multi-layer carbon fiber cones deliver lightweight strength and exceptional musical accuracy while the ceramic dome tweeters reproduce ultra-detailed high frequencies with excellent transient response and low distortion.
• HIGH-END MOTOR & CNC COMPONENT DESIGN: Features FEA-optimized neodymium motor structures, CNC-machined aluminum baskets and trim rings, copper-capped motors, and vented cooling designs for improved efficiency, durability, and thermal stability.
• DESIGNED FOR ELITE SOUND QUALITY BUILDS: Engineered for active DSP-controlled installations and high-end SQ systems where imaging, tonal balance, vocal detail, and realistic sound reproduction are critical priorities.
• PREMIUM MATERIALS & LOW DISTORTION PERFORMANCE: Built with non-conductive TIL voice coil formers, CCAW and copper voice coil technology, vented die-cast aluminum baskets, and advanced suspension engineering to achieve precise, dynamic, and highly controlled sound reproduction.

B2 Audio 3-Way 6.5" REF SQ Series Car Audio Component Speaker System

This Listing Includes:

• (2) 6.5" Carbon Fiber Cone Mid-woofers


• (2) 3" Carbon Fiber Full-Range Midrange Speakers


• (2) 1" Ceramic Dome Tweeters

Experience breathtaking clarity, detail, and full-spectrum sound reproduction with the B2 Audio REFSQ63 Reference Series 3-Way Component Speaker System. Engineered for elite sound quality builds and audiophile-level listening, this premium speaker package delivers exceptional resolution, accurate tonal balance, and immersive staging for serious car audio enthusiasts.

The REFSQ63 combines powerful 6.5" carbon fiber mid-woofers, ultra-clear 3" full-range midrange drivers, and highly detailed 1" ceramic dome tweeters into a refined 3-way system capable of reproducing every nuance of your music with outstanding realism and precision.

Built with premium materials and advanced engineering throughout, the REFSQ63 features multilayer carbon-fiber cones, CNC-machined aluminum components, FEA-optimized neodymium motor structures, and low-distortion suspension designs to achieve exceptional clarity, transient response, and dynamic control.

From deep, controlled midbass to articulate vocals and shimmering high frequencies, the REFSQ63 delivers a coherent, highly detailed soundstage worthy of the Reference Series name.

Features

• Premium 3-way component speaker system


• 6.5" and 3" multi-layer carbon fiber cones for strength and musical accuracy


• 1" ceramic dome tweeters for precise and detailed high frequencies


• FEA-optimized neodymium motors on midrange and tweeter drivers


• CNC-machined aluminum baskets and trim rings


• Non-conductive TIL voice coil formers for improved damping control


• CCAW and copper voice coil designs for reduced moving mass


• Vented baskets and pole pieces for improved thermal management


• Designed for elite sound quality and audiophile car audio systems


• Excellent for active DSP-controlled installations

Component Specifications:

6.5" Midwoofer:

• Max Power Handling: 100W


• RMS Power Handling: 70W


• Nominal Impedance: 4 Ohm


• Voice Coil Diameter: 1.4" / 35.5 mm


• Cone Material: Multi-layer Carbon Fiber


• Magnet: High Density Ferrite


• Frequency Response: 50 Hz - 10 kHz


• Sensitivity (1W/1M): 87.6 dB


• Mounting Depth: 2.93" / 74.5 mm


• Cutout Diameter: 5.31" / 135 mm


• Overall Diameter: 6.5" / 165 mm


• Unit Weight: 3.74 lbs / 1700g

3" Mid-Range:

• Max Power Handling: 100W


• RMS Power Handling: 30W


• Nominal Impedance: 4 Ohm


• DC Resistance: 3.35 Ohm


• Voice Coil Diameter: 1.2" / 30.5 mm


• Voice Coil Former: TIL (non-conductive)


• Voice Coil Wire: Copper


• Magnet: Neodymium, FEA-optimized with copper cap


• Cone Material: Multi-layer Carbon Fiber


• Basket: Vented Die-Cast Aluminum


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


• Sensitivity (1W/1M): 88.0 dB


• Mounting Depth: 1.52" / 38.6 mm


• Cutout Diameter: 3.02" / 76.8 mm


• Overall Diameter: 3.62" / 92 mm


• Unit Weight: 450g

T/S Parameters:

• Fs: 131.8 Hz


• Qms: 5.575


• Qes: 0.379


• Qts: 0.355


• BL: 5.392 T-M


• Mms: 3.97 g


• Cms: 0.367 mm/N


• Vas: 0.475 L


• Sd: 30.19 cm


• Le: 0.151 mH


• Zo Max Impedance: 52.653 Ohm


• Zmin: 3.974 Ohm


• Reference Efficiency: 0.278%

1" Ceramic Dome Tweeter

• Max Power Handling: 75W Peak / 25W RMS


• Nominal Impedance: 3.0 Ohm


• DC Resistance: 2.3 Ohm


• Voice Coil Diameter: 1.0" / 25.4 mm


• Voice Coil Former: Polyimide


• Voice Coil Wire: CCAW


• Cooling: Vented + copper conduction


• Magnet Structure: Internal dual neodymium


• Dome Material: Ceramic


• Surround: VC-connected only - no dome interaction


• Housing: CNC Aluminum for low resonance and thermal control


• Frequency Response (-6dB): fs ~ 20,000 Hz


• Sensitivity (1W/1M): 86.0 dB


• Mounting Depth: 1.1" / 28 mm


• Cutout Diameter: 1.79" / 45.4 mm


• Overall Diameter: 2.24" / 57 mm


• Unit Weight: 150g

T/S Parameters:

• Fs: 553.9 Hz


• Qms: 3.359


• Qes: 0.893


• Qts: 0.705


• BL: 2.691 T-M


• Mms: 0.808 g


• Cms: 0.102 mm/N


• Vas: 9.386 mL


• Le: 0.040 mH


• Zo Max Impedance: 10.955 Ohm


• Zmin: 2.903 Ohm


• Reference Efficiency: 0.173%

Dimensions

• Shipping box size: 20.25" x 13.25" x 4.5"


• Shipping weight 14.10 lbs

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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