Apocalypse ATOM-400.4 PRO | 400 Watt 4-channel amplifier

Unleash uncompromising power with the Apocalypse ATOM-400.4 PRO 4-Channel Amplifier, built for demanding multi-speaker systems that need serious low-impedance stability. Unlike most 4-channel amps on the market that top out at 2 Ohm per channel, the ATOM PRO runs stable all the way down to 1 Ohm — giving you the flexibility to wire complex setups like three pairs of speakers at a combined 1.33 Ohm load without breaking a sweat. Compact enough to fit tight installations yet powerful enough to rival Class AB sound quality, the ATOM-400.4 PRO delivers big output from a small footprint.

Key Features

• Stable Down to 1 Ohm – Handles demanding low-impedance wiring configurations most 4-channel amps can't
• 4 x 400 Watts RMS – Full power output at 1 Ohm per channel
• 2 x 800 Watts RMS Bridged – Extra headroom at 2 Ohm bridged mode
• Compact, Space-Saving Design – Fits into tight or challenging installations
• Class AB-Level Sound Quality – Verified indistinguishable in blind tests by competition judges
• Adjustable Crossover Controls – Dial in high-pass and low-pass filtering for precise tuning
• High Signal-to-Noise Ratio – Clean, accurate sound reproduction
• Heavy-Duty Terminal Connections – Built for high-current wiring setups

Specifications

• Model: Apocalypse ATOM-400.4 PRO
• Channels: 4-Channel
• Power RMS (4 Ohm): 4 x 200 Watts
• Power RMS (2 Ohm): 4 x 310 Watts
• Power RMS (1 Ohm): 4 x 400 Watts
• Power RMS (4 Ohm Bridged): 2 x 620 Watts
• Power RMS (2 Ohm Bridged): 2 x 800 Watts
• High Pass Filter: 20 – 12,000 Hz
• Low Pass Filter: 45 – 12,000 Hz
• Crossover Slope: 12 dB/Octave
• Frequency Response: 20 – 20,000 Hz
• Input Sensitivity: 0.2 – 6V
• Input Sensitivity (High Level Inputs): 1.7 – 11V
• Signal-to-Noise Ratio: 80 dB
• Damping Factor: 102
• Integrated Fuse: No
• Input Terminal Connection: 4 AWG / 21.2 mm²
• Output Terminal Connection: 10 AWG / 5.27 mm²

SKU: DEF-ATOM-400.4PRO
GTIN: 4650185712777

Free shipping is available within the 48 U.S. states. Orders placed before 11 PM ET are typically processed the next business day and arrive within 5–8 business days. Tracking information will be provided as soon as your order ships.

Need to make a change to your order? Contact us within 24 hours of purchase, and we'll be happy to help. Please note that orders already processed for shipment cannot be canceled.

1-Year Limited Warranty: As an authorized dealer, we provide a 1-year limited warranty covering manufacturer defects in materials and workmanship under normal use. The warranty does not cover physical damage, misuse, improper installation, or normal wear and tear.

Customer Support : 9:00 am to 5:00 pm 

Address: 13446 Alondra Boulevard, Cerritos ,California 90703, United States

Email: info@eliteautogear.com

Phone: (877)-215-8187