Digital control line amplifier, PO1J model, 12V power supply, LINE IN/OUT terminals. - Model: PO1J - Brand: NFJ - Input terminals: LINE IN - Output terminals: LINE OUT - Power supply: DC 12V Price changed. Power adapter included. Thank you for viewing. This is a 1-input, 1-output control line amplifier (preamplifier) equipped with BBE/3D sound function NJW1147L audio processor IC & op-amp buffer. By placing it in front of a simple power amplifier, you can add tone control functions, and volume adjustment without gang errors is possible with the electronic volume. In addition to tone control adjustments, it is also a compact but feature-packed item, such as correcting compressed audio with BBE sound during playback, or making audio easier to hear with ViVA 3D correction when playing TV audio. Product Features ■ Equipped with NJW1147L audio processor IC ・ Equipped with BBE sound enhancement for natural and clear sound ・ Equipped with BBE's surround function "ViVA" for a natural sense of spaciousness ・ High-quality electronic volume function without volume resistor degradation or gang errors ・ Tone control function ■ Equipped with op-amp buffer ・ Equipped with TI NE5532P op-amp 　Since it is a socket-type op-amp, the op-amp can be changed. *Not covered by warranty