Sony XM-N1004

Automatic Thermal Contro l- High temperatures can adversely affect amplifier components. The amplifier then switches off until the temperature drops again. Automatic Thermal Control reduces the output of the amplifier so you don't have to worry about the amplifier suddenly failing. Stay Cool - The amplifier is designed for maximum air circulation within the unit, keeping it cool while delivering a stable, powerful sound with no distortion. Low Pass Filter (LPF) - Music sounds better when the correct frequencies are passed to the appropriate parts of the speakers. The integrated low-pass filter ensures that only deep bass is passed on to the subwoofer. High-quality components - Play back your favourite tracks in superior sound quality. The high-performance stereo amplifier ensures realistic, reliable sound reproduction thanks to high-quality audio capacitors, output transistors and choke coils. High Pass Filter (HPF)
Like the low-pass filter, the HPF ensures that everything but the deepest bass sounds are routed to your full-range speakers.