B2 Audio class A/B Ref Four 4CH 1200W SQ Amplifier 4-ohm 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
• Includes clip, voltage, and temperature indicators for reliable system monitoring
• Rugged construction with 0-gauge power terminals and compact 16.42" x 6.30" x 2.52" size

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

This listing includes:

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


• Bass Knob

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, and a smart monitoring system with clip, voltage, and thermal 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


• Level Control: Included (Clip / Volt / Temp indicators)


• 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"