Zapco ST-5B 5-Ch. Class AB Amplifier 13.5" Subwoofer The port mouth is flared

The port mouth is flared to minimize air-flow noises

one-hole design makes installation a breeze

- Frequency Response: 48 Hz ~ 5 KHz

Filter Mode(s): Channels 1 & 2 (front) High-Pass only Filter Slope(s): Channels 1 & 2 (front) 12 dB/octave Filter Frequency Range: Channels 1 & 2 (front) 50 Hz - 500 Hz Filter Mode(s): Channels 3 & 4 (rear) High-Pass only Filter Slope(s): Channels 3 & 4 (rear) 12 dB/octave Filter Frequency Range: Channels 3 & 4 50 Hz - 500 Hz Filter Mode(s): Subwoofer Channel Low-Pass only Filter Slope(s): Subwoofer Channel 12 dB/octave Filter Frequency Range: Subwoofer Channel 50 Hz - 500 Hz Detented

Large LED backlit push-button controls are easy-to-see and easy-to-use

Zapco ST-5B 5-Ch. Class AB Amplifier 13.5" Subwoofer The port mouth is flaredThe ST B Series. Great sound for every day use. Zapco has a reputation for sound reproduction and quality that is unsurpassed. It is our dedication to sonic purity and our passion for performance that built Zapco's reputation. With all the new amps coming into the market, not one has been any threat to Zapco's standing as the premium amp and processor line. Just check the audio competition scene and the audio forums. The pros know what to use to win.