One of the most confusing features of the A-5j is the Sigma Drive switch. The owner’s manual dedicates four pages to explaining that Sigma Drive is a negative feedback loop taken from the speaker terminal rather than the amplifier's output terminal. Using it incorrectly (e.g., when bi-amping) can cause oscillation. The manual teaches you when to turn it "On" versus "Off."
: Guidance on using the A and B speaker terminals and managing the ground terminal for phono inputs to eliminate hum. Kenwood Amplifier A-5j Manual
: Typically includes inputs for Phono (to connect your turntable), CD, Tuner, and Tape decks. One of the most confusing features of the