Powerbass ACS-4090 4-Channel Amplifier

Powerbass ACS-4090 is a compact 4-channel amplifier delivering 90W RMS per channel into 2 ohms, engineered for high-fidelity, space-limited car installs. Built for enthusiasts who demand Class A/B full-range performance in a small chassis, it uses a 6 oz/kg high-density heatsink for efficient cooling.

• 4-Channel, 90W RMS x4 @ 2 ohms: Provides solid, per-channel power to four speakers, delivering clear, dynamic performance even when the system demands loud, clean playback at low impedances.
• 2-ohm Stable (4-ohm in Bridged Mode): Supports low-impedance speaker loads for higher output per channel, and, when bridged, can yield higher mono power into a 4-ohm load.
• Peak Power: 720 watts: Represents the amplifier’s maximum instantaneous power potential, useful for transient dynamics and bass impact during peak musical moments.
• PWM MOSFET Power Supply: Uses a switching power design to supply the amplifier with consistent voltage, contributing to efficient operation and compact cooling demands.
• Inputs: High Level (Speaker)/Low Level (RCA) Input: Flexible integration with both factory head units and aftermarket sources, enabling easy installation paths.
• Remote Soft Delay Turn On/Off Circuit: Eliminates turn-on pops and creates a smoother power-up sequence, preserving speaker integrity and listening fatigue.
• Variable High/Low Pass Electronic Crossover: Lets you tailor the frequency range for each channel, optimizing voice and instrument clarity and matching speaker characteristics.
• Selectable 12dB Bass Boost EQ: Adds targeted bass energy without overwhelming the rest of the spectrum, usable to align bass response with speaker/system goals.
• Variable Gain Control: Allows precise input level matching to prevent distortion and maximize dynamic range across all channels.
• Protection Circuit: Guards against impedance overload, speaker short, thermal overheating, and DC output conditions, helping maintain reliability in recoverable fault scenarios.
• Output Power (14.4V): @ 4 ohm: 45 watts x 4; @ 2 ohm: 90 watts x 4; @ 1 ohm: N/A — defines real-world operating power under typical automotive electrical conditions.
• Frequency Response: 10 Hz – 50 kHz — covers the full audible spectrum with headroom for musical transients and high-frequency detail.
• Signal-to-Noise Ratio: >100 dB — indicates very low intrinsic noise for clean, quiet backgrounds at generous listening levels.
• Total Harmonic Distortion: 0.3% @ Rated Power — low distortion contributes to accurate, musical playback across the amp’s output range.
• Dimensions: Dimensions (in Inches): 12.8" x 7.1" x 2.0"; Depth: 12.8" — a compact footprint suitable for tight installations while preserving mounting versatility.
• High-Density Heatsink: 6 oz/kg design provides efficient cooling in a small chassis, helping maintain performance during longer listening sessions.

In a real-world build, the ACS-4090 shines as a four-channel power base for component systems or a compact multi-amp setup in vehicles with limited space. Its adjustable crossovers, bass boost, and broad frequency response let you sculpt a balanced, high-fidelity signal to each speaker while protective features and solid thermal management help keep the system stable under demanding listening sessions.