B-Stock B² Audio REF SQ63

B-Stock Description:
The speaker grille on a midrange and tweeter is dented; the dome and diaphragm are undamaged. The set has never been used and will be delivered in its original packaging.


Experience breathtaking clarity and precision across the entire sound spectrum with the B2 Audio REFSQ63 Reference Series 3-Way Component System, a premium audio solution designed for competition-level quality and everyday use at the highest level.

This system combines powerful, rich-sounding 6.5-inch low-midrange drivers with ultra-clear 3-inch midrange drivers and extremely responsive 1-inch ceramic dome tweeters. Each component has been engineered for maximum resolution, low distortion, and linear dynamics, ensuring that your audio system reproduces every nuance with rich detail and precision.

From precise control of the midrange to nuanced reproduction of the full vocal range and the shimmering finesse of the highs, the REFSQ63 delivers a coherent and immersive soundstage worthy of the Reference seal.

Multi-layer carbon diaphragms
Both the midrange drivers and the low-midrange drivers utilize a rigid, lightweight carbon construction for clean, controlled reproduction and powerful output with minimal distortion.

1" Ceramic Dome Tweeter
Delivers incredibly precise and delicate high-frequency detail with a CCAW voice coil, two neodymium magnets, and a vented aluminum housing for low distortion and heat dissipation.

3" full-range midrange driver with CNC-machined gold accents 
FEA-optimized neodymium motor with a precisely matched copper cap and gold-plated CNC yoke and top plate ensures low compression, rich vocals, and smooth upper mids.

High-efficiency, low-compression design
Ventilated die-cast aluminum baskets, copper shorting rings, and non-conductive voice coil carriers maximize airflow, heat dissipation, and sound clarity at high volumes.

Performance Specifications
6.5" midrange driver: 100W Max / 70W RMS
3" full-range driver: 100W Max / 30W RMS
1" tweeter: 75W Max / 25W RMS
Nominal impedance: 4Ω (woofer & midrange), 3Ω (tweeter)


Features
✓ 6.5" and 3" multi-layer carbon fiber cones for stability, control, and musicality
✓ 1" ceramic dome tweeter for extremely precise and delicate high frequencies
✓ FEA-optimized neodymium magnets for tweeters and midrange drivers
✓ Non-conductive TIL voice coil carriers for damping control
✓ CCAW and copper voice coils to reduce moving mass
✓ Gold-plated cover plates, CNC-machined aluminum baskets, and decorative rings
✓ Ventilated baskets and pole pieces for thermal and acoustic efficiency
✓ Perfect for active or passive 3-way soundtrack systems

Crossover Configuration Explained:
This set includes a 2-way bi-amping crossover that allows you to drive the woofer and tweeter through separate amplifier channels. This configuration is particularly popular among audiophiles who want maximum control and fine-tuning in their system.

Although a true tri-amping crossover would require a 6-channel amplifier with identical circuitry (which increases complexity and cost), this crossover offers greater flexibility. It can be operated as a 2-way system (woofer + tweeter per side), while the included 3-inch full-range driver can be actively driven by your DSP or amplifier.

This allows you to set up a passive/active hybrid system using just a single 4-channel amplifier, or to operate a fully active system with a DSP for maximum control. This design gives you the freedom to choose between the convenience of traditional passive systems and advanced active configurations—without having to commit to a single option.

Component Specifications:

6.5-inch mid-bass driver
Maximum power handling: 100 W
RMS power handling: 70 W
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 (1 W/1 m): 87.6 dB
Mounting depth: 2.93" / 74.5 mm
Cutout diameter: 5.31 inches / 135 mm
Overall diameter: 6.5" / 165 mm
Unit weight: 3.74 lbs / 1700 g


3" midrange driver
Maximum power handling: 100 W
RMS power handling: 30 W
Nominal impedance: 4 ohms
DC resistance: 3.35 ohms
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: Ventilated die-cast aluminum basket
Frequency response (-3 dB): 200 Hz – 20,000 Hz
Sensitivity (1 W/1 m): 88.0 dB
Mounting depth: 1.52" / 38.6 mm
Cutout diameter: 3.02" / 76.8 mm
Overall diameter: 3.62 inches / 92 mm
Unit weight: 450 g

Tweeter:
Maximum power handling: 75 W peak / 25 W RMS
Nominal impedance: 3.0 ohms
DC resistance: 2.3 ohms
Voice coil diameter: 1.0" / 25.4 mm
Voice coil former: Polyimide
Voice coil wire: CCAW
Cooling: Ventilated + copper conductor
Magnet structure: Internal dual neodymium magnet
Dome material: Ceramic
Surround: VC-bonded only—no interaction with the dome
Enclosure: CNC-machined aluminum for low resonance and optimal heat dissipation
Frequency response (-6 dB): fs ~ 20,000 Hz
Sensitivity (1 W/1 m): 86.0 dB
Mounting depth: 1.1" / 28 mm
Cutout diameter: 1.79" / 45.4 mm
Overall diameter: 2.24 inches / 57 mm
Unit weight: 150 g

This offer includes:
(2) 6.5" full-range midrange drivers
(2) 3" midrange drivers 
(2) 1" ceramic dome tweeters
(2) Passive 2-way crossovers
B-Stock