Subwoofer applications

The ZXCDSUBEV series of reference designs provides closed loop, analog input Class D amplifiers for subwoofer applications. The simple scalable architecture enables very cost effective circuits at output power levels of 150W, 300W and 500W into 4Ω with exceptional audio performance.

Achieving THD+N figures better than 0.05% up to 90% full power with a flat frequency response up to 250Hz, the ZXCDSUBEV reference designs are setting new standards for audio performance in active subwoofers.

These switching amplifiers owe much of their outstanding audio performance to a unique feedback architecture designed to reduce distortion. By taking its feedback signal from the filtered amplifier output, this high gain circuit design compensates for bridge mismatches and filter non-linearities, to achieve a reduction in THD+N across the entire power band.

The high performance ZXCD1210 modulator IC forms the heart of the amplifier design, providing complete control of the modulation function. Selection of FET's with optimum switching characteristics completes the N-channel FET power output stage.