Sony XM 7557

Sony XM 7557 ... filter corresponding to a wide range of frequencies;

Built-in variable LPF (Low-pass filter), HPF (High-pass filter), and low boost circuit;

The DIRECT switch can be used to bypass the low-pass filter, high-pass filter for more enjoyable high-quality sound;

Possible to switch between HI-CURRENT mode (1-251) and HI-VOLTAGE mode (2-451) for subwoofer;

Negative Feed Back (ON/OFF) switchable;

Independent voltage amplifier power supply;

Pulse power supply for stable, regulated output.