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Hi Bigjames6, It is recommended to use a subwoofer to enjoy the full capabilities of the receiver. If you're having issues with the subwoofer, kindly check on this link for troubleshooting steps to help isolate the issue: https://www.sony.com/electronics/support/audio-components-receivers-amplifiers/str-dh590/articles/00024783 ~Ralph
Sorry, there was a problem. Please try again later.I have the 550 I am just using it as a basic receiver
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