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アンプ ATI Audio AT1802のPDF オーナーズマニュアルをオンラインで閲覧またはダウンロードできます。ATI Audio AT1802 12 ページ。 Ati at1800 series 2- to 7-channel power amplifier owner's guide

If you suspect that the grounding system in your home's

electrical wiring is causing the hum problem, it is important that you do

not make any changes to the wiring yourself. Only a licensed electrician

should make any changes to household wiring, and they must be made in

full compliance with all local building, safety and electrical codes.