Power Acoustik PWM-20 – 4-Band Parametric Equalizer for Car Audio Systems

The Power Acoustik PWM-20 is a precision 4-band parametric equalizer designed for enthusiasts and installers looking to control every layer of their in-car sound. Whether you're working with a factory radio or an advanced aftermarket head unit, this unit gives you the tools to shape your audio profile with absolute control.

At its core, the PWM-20 features independent gain control across four adjustable frequency bands, offering fine-tuning with either ±12 dB or ±18 dB boost per band. This allows you to target and correct specific audio frequencies—ideal for compensating for cabin acoustics, speaker placement, or personal sound preferences.

Built with an isolated PWM (pulse-width modulated) power supply, the PWM-20 delivers clean signal processing without introducing unwanted noise or distortion. You get a subwoofer electronic crossover adjustable from 30 Hz to 250 Hz, ensuring your low-end is tight and focused without overwhelming your mids and highs.

Two RCA inputs enable you to connect the equalizer to various sources, including a CD player or aftermarket Bluetooth head unit. At the same time, dedicated RCA outputs provide a powerful, low-noise signal directly to your amplifiers. With a maximum output voltage of 7 VRMS (12 V peak) and a signal-to-noise ratio of 110 dB, the PWM-20 ensures your amplifiers receive the cleanest signal possible for high-performance playback.

Additional features include:

• Independent master volume control, subwoofer level, and fader adjustment
• Selectable input switch (CD/Radio)
• Blue LED backlighting for nighttime visibility
• Frequency response: 20 Hz – 20 kHz
• Compact chassis (7″ × 4.25″ × 1.25″), easily mountable in most dashboards or glove boxes
• Built for 12V automotive electrical systems (11–16V DC input)

From daily drivers to demo builds, the Power Acoustik PWM-20 is a go-to tool for serious car audio tuning. It’s not just about boosting bass or dialing back treble—it’s about precision signal management across your entire soundstage.

If you're searching for a car audio parametric equalizer, Power Acoustik crossover, or RCA-based preamp equalizer, the PWM-20 checks all boxes for clarity, control, and compatibility.