Officially, Kenwood has not hosted the A-5J manual on its modern global support sites. The unit was built for the Japanese market, so it's highly likely the only official manual was printed in Japanese and was never digitized for a global audience. This explains why many owners have spent years "looking until their eyes hurt" for a digital copy.
The service manual provides a signal trace path. Usually, this points to the "Loudness" switch or the "Tape Monitor" switch contacts. The manual shows how to access the switches for cleaning with DeoxIT. Kenwood Amplifier A-5j Manual
Links to official or user-uploaded manuals for similar Kenwood components. Officially, Kenwood has not hosted the A-5J manual
Features terminals for both Speaker A and Speaker B, allowing you to run a multi-room setup or bi-wire compatible speakers. Step-by-Step Setup Guide The service manual provides a signal trace path
Adjusts low and high frequencies by ±10dB. Set these to the center "click" position for flat, uncolored audio reproduction.