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

• Full-range Class A/B amplifier with 4-channel output for high-fidelity car audio
• Delivers up to 1200W RMS bridged at 4 ohms or 4 x 300W RMS at 2 ohms
• Built-in 24 dB/oct crossover, bass boost, and high/low pass filters for precise tuning
• Rugged construction with 0-gauge power terminals and compact 16.42" x 6.30" x 2.52" size

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

This listing includes:

• (1) B2 Audio REF FOUR 4-Channel Class A/B Amplifier

The B2 Audio REF FOUR is a robust, full-range 4-channel amplifier built with Class A/B topology for audiophiles who demand sound quality, headroom, and flexibility. With a wide frequency response of 15 Hz to 25 kHz, the REF FOUR delivers clean, controlled power across the entire audible spectrum. It features advanced crossover options, bass EQ boost, monitoring system with clipping indicators. Capable of pushing 4 x 300W RMS at 2 ohms or 2 x 1200W RMS bridged at 4 ohms, this amplifier is ready for both daily systems and competition-grade builds. Its rugged build, 0-gauge power terminals, and efficient layout make it a premium choice for high-performance installations.

Specifications:

• Model: REF FOUR


• Circuit Configuration: Class A/B


• Frequency Response: 15 Hz – 25 kHz


• Signal to Noise Ratio: >90 dB


• Input Sensitivity: 6 V – 0.3 V


• Crossover Circuit: 24 dB/Oct


• Low Pass Crossover: 40 Hz – 400 Hz


• High Pass Crossover: 40 Hz – 4 kHz


• Bass EQ: 45 Hz / 0–12 dB


• Power Terminal Gauge: 0 Gauge / 67 mm


• Fuse Rating: 150 A


• Dimensions (All in Inches): 16.42" (Length) x 6.30" (Width) x 2.52" (Height)

Continuous Output Power (RMS) @ 14.4V 1% THD:

• 4 Ohm: 4 x 200W RMS


• 2 Ohm: 4 x 300W RMS


• 4 Ohm Bridged: 2 x 1200W RMS

Power Supply Requirements:

• Minimum Battery (AGM): 75 Ah / 1000 CCA


• Lithium Battery: 20 Ah minimum

Measurements:

• Length:  18"


• Width:    6.5"


• Height:   3"