The NJM4580 is a dual operational amplifier，specially designed for improving the tone control，which is most suitable for the audio application. Featuring noiseless，higher gain bandwidth，high output current and low distortion ratio，and it is most suitable not only for acoustic electronic parts of audio pre-amp and active filter，but also for the industrial measurement tools. It is also suitable for the head phone amp at higher output current and further more，it can be applied for the handy type set operational amplifier of general purpose in application of low voltage single supply type which is properly biased of the low voltage source. The D-Rank type products(NJM4580DD/MD/ED/LD) have specified maximum limits for equivalent input noise voltage.