... MMC+FM 2. Selected high-power four-channel professional power amplifier integrated circuits, minimal distortion, strong power 3. Pre- ... professional level input operational amplifier IC for circuit design, sound, transparent, bright. 4. Filtering ... 4W 1KHz SNR: >80dB Bass/Tremble control: +/-10dB The signal level: 220MV 47K Reader, u-disk format: MP3, WMA/FM ...