B2 Audio 6.5" REF SQ 3-Way Component Speaker System w/Crossover

• COMPLETE REFERENCE PACKAGE: Includes woofers, mids, tweeters, and premium passive crossover networks for a full front-stage solution
• AUDIOPHILE SOUND QUALITY: Delivers exceptional imaging, tonal balance, and detail across the full frequency spectrum
• PREMIUM CROSSOVER NETWORKS: REF3WBX passive crossovers properly distribute frequencies while allowing tweeter tuning adjustment
• HIGH-END MATERIALS THROUGHOUT: Carbon fiber cones, ceramic dome tweeters, CNC aluminum housings, and oversized crossover components
• SHOW BUILD READY: Transparent crossover covers and exposed copper coils create an ultra-premium installation appearance
• BUILT FOR SQL & SQ SYSTEMS: Perfect for reference-level daily drivers, DSP systems, and competition-inspired builds

B2 Audio 3-Way 6.5" REF SQ Car Audio Component Speaker System w/ 3-way Crossover

This Listing Includes:

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


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


• (2) 1" Ceramic Dome Tweeters


• (2) B2 Audio REF3WBX 3-Way Passive Crossovers

Step into true reference-grade sound with the B2 Audio REFSQ63 + REF3WBX Complete 3-Way Component Speaker Package. Designed for elite sound quality builds and audiophile-level performance, this complete front-stage solution combines the incredible detail and realism of the REFSQ63 Reference Series speaker system with the precision tuning and premium signal management of the REF3WBX passive crossovers.

This is not your average component set. Every element of this package is engineered for accuracy, staging, tonal balance, and emotional impact. From the deep, controlled midbass response of the 6.5" carbon fiber woofers, to the rich vocal presence of the 3" full-range mids, all the way to the crisp shimmer of the ceramic dome tweeters, the REFSQ63 delivers breathtaking clarity across the entire frequency spectrum.

Paired with the stunning REF3WBX passive crossover networks, this system gains smooth frequency distribution, refined transition points, and adjustable tweeter attenuation for dialed-in tuning flexibility. The exposed crossover architecture featuring oversized copper coils and acrylic covers adds pure “show build†energy while maintaining audiophile-grade performance.

Whether you’re building a high-end SQL daily driver, a competition-ready sound quality car, or a clean European-inspired install, this package delivers the detail, dynamics, and realism expected from B2 Audio’s Reference Series.

Features

• Complete 3-way reference component speaker system


• Includes matching REF3WBX passive crossover pair


• Multi-layer carbon fiber woofer and midrange cones


• 1" ceramic dome tweeters for exceptional detail


• Adjustable tweeter attenuation on crossover networks


• CNC-machined aluminum speaker components


• FEA-optimized neodymium motor structures


• Premium exposed crossover design with acrylic covers


• Designed for elite SQ and audiophile-grade installations


• Excellent for DSP-integrated or passive crossover systems

Component Specifications:

6.5" Midwoofer:

• Max Power Handling: 100W


• RMS Power Handling: 70W


• Nominal Impedance: 4 Ohms


• 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 Ohms


• 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%

Crossover Specifications:

• Model: B2-REF3WBX


• Type: 3-Way Passive Crossover


• Configuration: Woofer / Midrange / Tweeter


• Tweeter Level Adjustment: Yes


• Connection Type: Screw Terminal


• Protective Cover: Clear Acrylic


• Quantity: Pair


• Application: Car Audio Component Systems

Crossover Dimensions:

• Length: 5.5"


• Width: 3.7"


• Depth: 1.6"

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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:

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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.

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