Audiotek AT-1800S 2-Channel Car Amplifier

The Audiotek AT-1800S is a two-channel, full-range car audio amplifier for adding external amplification to speakers or subwoofers. It is designed for systems that need more output flexibility than a head unit's built-in amplifier can provide. The amplifier is rated at up to 1800 watts maximum power and supports stereo, bridged, and tri-mode system configurations.

This Class A/B model is intended for listeners building a basic speaker upgrade, a subwoofer-focused setup, or a mixed car audio system. Its 2-ohm-stable design gives installers more options when matching compatible speaker loads. The full-range design also allows it to be used beyond dedicated bass duties when configured appropriately.

The AT-1800S provides a continuously variable low-pass crossover and bass-boost adjustment for tailoring low-frequency output. An included remote subwoofer control gives the driver convenient access to bass-level adjustment from the cabin. Variable input gain helps match the amplifier to the output level of the connected source unit.

For source integration, the amplifier offers nickel-plated RCA inputs as well as speaker-level inputs. This supports use with aftermarket receivers that provide RCA preouts and with systems that need a high-level input connection. A remote turn-on/turn-off circuit is also included for coordinated amplifier operation with the vehicle audio system.

The amplifier uses a MOSFET pulse-width-modulated power supply and includes thermal and speaker-short protection circuitry. Power and protection LED indicators provide a quick operating-status reference. These features make the AT-1800S a practical component for a planned car audio upgrade when matched with compatible speakers, wiring, and source equipment.

Key Features

• Two-Channel Class A/B Design: Supports stereo amplification for speakers or a bridged configuration for a compatible load.
• 2-Ohm Stable Operation: Accommodates compatible low-impedance speaker wiring configurations.
• 1800-Watt Maximum Rating: Provides the manufacturer-marketed maximum power figure for system planning.
• Remote Bass Control: Lets the driver adjust subwoofer-level output from the cabin.
• High- and Low-Level Inputs: Supports speaker-level wiring and RCA source connections.
• Protection and Status LEDs: Helps identify power status and protection activation.

Design & Installation

The AT-1800S uses a heavy-duty aluminum-alloy heat sink to support heat dissipation during operation. Its Class A/B amplifier architecture, MOSFET power supply, and front-panel control layout are designed for conventional mobile-audio installations. Power and protection LED indicators provide visible status feedback.

Mount the amplifier securely in a dry, ventilated location with clearance around the heat sink. Connect it through either the nickel-plated RCA inputs or speaker-level inputs, then set gain, crossover, and bass-boost controls to suit the connected speakers or subwoofers. Confirm final speaker impedance and bridged or tri-mode wiring with the amplifier documentation before powering the system.