The Electro-Voice ZXA1-Sub's low end boost switch introduces a 60Hz boost. This is excellent should you require more definition and power in your low end. A polarity switch provides more compatibility with other top boxes and includes an IEC jack for power, commonly used on computer and pro audio equipment. The dual inputs and outputs mean easy cable management and mono sub configuration. The wooden enclosure gives better management and enhancement of the low frequencies and increased durability. Pole mounts and solid easy grip handles make the ZXA1-Sub ideal for many portable applications.