B2 Audio 4CH 1200W SQ Amplifier 4-ohm Bridgeable Class A/B Ref Four

Meet the B2 Audio REF FOUR, a full-range 4-channel Class A/B amplifier built for audiophiles who demand headroom, precision, and flexible power in a compact chassis. It delivers targeted, high-fidelity drive with a bridgeable option for high-power sub/bass applications.

• 4-channel Class A/B: Full-range, low-distortion amplification across four channels for accurate vocal, instrument, and scene depth in a car system.
• 4 x 200W RMS @ 4 Ω: Clean, steady power to four channels at a 4-ohm load, suitable for mid/high speakers with good headroom.
• 4 x 300W RMS @ 2 Ω: Higher current capability to drive demanding or lower-impedance speakers without folding into distortion.
• 4 Ω Bridged: 2 x 1200W RMS: Bridge two channels to power a sub or high-power bass setup with substantial output while maintaining control.
• Built-in 24 dB/Oct crossover: Steep filtering aids precise spectral separation, reducing crosstalk and simplifying system tuning.
• Low Pass Crossover: 40 Hz–400 Hz and High Pass Crossover: 40 Hz–4 kHz: Targeted bass limiting and mid/high protection for clean integration with subs and front/rear stages.
• Bass EQ: 45 Hz / 0–12 dB: Ability to boost or tighten the low end to match your vehicle acoustics and personal taste.
• Frequency Response: 15 Hz – 25 kHz: Wide range supports full-range performance while preserving high-frequency detail.
• Signal-to-Noise Ratio: >90 dB: Low noise floor helps keep quiet passages clean and dynamic musical detail audible.
• Input Sensitivity: 6 V – 0.3 V: Accommodates a broad range of head-unit outputs for flexible installation.
• Power Terminals: 0 Gauge and Fuse Rating: 150 A: Heavy-gauge wiring and substantial protection support stable, high-current operation.
• Dimensions: 16.42" L x 6.30" W x 2.52" H: Compact footprint suitable for tight trunks and dash installations without sacrificing power.
• Power Supply Requirements: AGM 75 Ah / 1000 CCA or Lithium 20 Ah minimum: Guidance to ensure adequate reserve for peak demand and consistent performance.
• Rugged construction: Built to endure the vibration and temperature swings of automotive environments while preserving audio integrity.

In a premium car-audio build, REF FOUR serves as the central four-channel engine for front and rear channels while enabling a bridged bass path without needing multiple processors. The integrated filters and bass EQ simplify tuning, and the 0-gauge power terminals plus a 150 A fuse support stable operation under demanding listening sessions.