Audiobank AB1400.4 4-Channel Car Audio Amplifier

The Audiobank AB1400.4 is a four-channel Class A/B car audio amplifier for adding dedicated power to an aftermarket speaker system. It is designed for front-and-rear speaker upgrades where a factory or aftermarket head unit alone does not provide enough output. With four amplified channels, it can serve a conventional full-range system while allowing separate tuning for connected speakers.

This amplifier supports stereo speaker loads down to 2 ohms and is rated at up to 350 watts maximum per channel at 2 ohms or 175 watts maximum per channel at 4 ohms, both at 1% THD. Its stated frequency response is 10 Hz to 30 kHz, covering low-frequency and full-range speaker applications. The four-channel layout makes it suitable for systems using separate front and rear speaker pairs.

Variable high-pass and low-pass crossover controls provide practical system-tuning flexibility. The low-pass crossover adjusts from 50 to 250 Hz, while the high-pass crossover adjusts from 80 Hz to 1.2 kHz. These controls can help direct an appropriate range of frequencies to the speakers connected to each channel.

The AB1400.4 accepts either line-level or speaker-level input signals, supporting integration with many aftermarket and compatible factory audio systems. Its input sensitivity range of 200 mV to 6 V accommodates a variety of source-unit output levels. A remote level-control bass knob is included for adjustment from the driver area.

Built-in soft start, muting, overload protection, thermal protection, and short-circuit protection are specified for monitored operation. A power and protection LED indicator provides at-a-glance operating status. The compact chassis is designed for installation in a ventilated location in a negative-ground 12-volt vehicle electrical system.

Key Features

• Four-Channel Class A/B Design: Provides dedicated amplification for front and rear speakers or other four-channel system layouts.
• 2-Ohm Stereo Stability: Supports compatible stereo speaker loads down to 2 ohms per channel.
• Variable Crossovers: High-pass and low-pass filters help tailor the signal for the connected speakers.
• Flexible Input Options: Line-level and speaker-level inputs support a range of source-unit connections.
• Remote Level-Control Knob: Includes a wired bass-level control for convenient adjustment from the listening position.
• Protection Circuitry: Soft start, muting, overload, thermal, and short-circuit protection support reliable operation.

Design & Installation

The AB1400.4 uses chrome-plated RCA, power, and speaker terminals for its primary wiring connections. Its chassis measures 10.5 inches wide, 2.19 inches high, and 13.07 inches deep. A power/protection LED indicator provides basic visual status feedback.

Mount the amplifier securely in a dry, ventilated location and connect it only to a negative-ground 12-volt vehicle electrical system. Use the line-level or speaker-level input that matches the source unit, then configure the crossover controls for the speakers and channel arrangement in use. Confirm speaker impedance, power wiring, grounding, fuse protection, and bridge wiring before installation.