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Hello, The AVR-S570BT will not work with Bose 901s. The 901s were Bose' flagship speaker when it was in production and because they are not particularly efficient, they require amplification with a good deal of speaker-driving heft. The 901s also require specific connectivity if they have the equalizer in the connection chain. Here is what Bose have to say regarding which equipment can work with their 901s: "The Bose 901 active equalizer is an integral part of the 901 Direct/Reflecting speaker system allowing for proper performance and sound. Over the past several years, manufacturers of receivers have made fewer products compatible with external equalizers — including the Bose 901 equalizer. To connect the 901 equalizer, a compatible receiver must have both preamp in and preamp out jacks. Alternatively, a separate preamplifier can be used in conjunction with a power amplifier to connect the equalizer."
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