※Shipping service. Starting with the structure of audio signals, principles and structures for producing good sound from speakers are explained in an easy-to-understand manner, such as the relationship between sound and hearing, as well as amplifiers and speaker systems. Edited by Ken Suzuki/Published by Nikkan Kogyo Shimbun
Maintenance information: B [The state is determined on a scale of 3 from A to C. (See below for details)]