The Dahlquist DQ-MX1 Dual Frequency Passive Crossover is a vintage piece of audio equipment that is perfect for any consumer electronics enthusiast. This passive matrixing crossover is designed to perfectly blend high and low frequencies, resulting in a smooth and enjoyable audio experience. With a brand name like Dahlquist, you can be assured of the quality and durability of this model. The DQ-MX1 is a reliable and efficient way to achieve passive crossover, making it a popular choice among vintage audio and video enthusiasts. This item falls under the categories of Consumer Electronics, Vintage Electronics, Vintage Audio & Video, and Vintage Amplifiers & Tube Amps. The outside screw on bezel for frequency switch is missing (as pictured) This is only cosmetic and does not affect the unit.