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"

Accepted Payment Methods at Big Jeff Audio

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:

Credit and Debit Cards

• Visa
• Mastercard
• American Express
• Discover
• Diners Club

Digital Wallets

• Amazon Pay
• Apple Pay
• Meta Pay (formerly Facebook Pay)
• Google Pay
• Shop Pay
• PayPal

International Payment Methods

• Bancontact
• iDEAL

Bank Transfers

• Zelle

Financing Options

We also offer financing options to make purchasing easier. Learn more about our financing options here.

• Klarna
• Affirm
• Sezzle
• Snap
• Acima
• Tiptop

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.

Shipping Options and Delivery Time

Do You Offer Expedited Shipping?

Yes! At checkout, you can select from different shipping options:

• Standard Shipping: Free for orders over $100.
• Expedited Shipping: Available at an additional cost, calculated based on the weight and destination of your order.

How Long Does Delivery Take?

• Handling Time: Most orders are processed and shipped within 1 business day after receiving cleared payment. Occasionally, additional handling time may be required, but we’ll notify you if that’s the case.
• Standard Shipping: Typically takes 3-5 business days, though delivery may be affected by extreme weather or holidays.

What Happens If My Package Is Undeliverable?

If your package is refused or marked undeliverable and returned to us by the carrier, you’ll need to pay the full shipping cost to have the package resent. Alternatively, we can refund your order, minus the cost of shipping.

Why Can’t I Track My Order?

If you're having trouble tracking your order:

• Make sure you’ve received the shipping confirmation email with the tracking number.
• Log into your account on our website and use the “Check Your Order Status” button.
• If the issue persists, please refer to our detailed guide on tracking your order or contact our customer service team for further assistance.