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