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Hi Kevin! Thanks for the question! We’re happy to assist with your audio setup. While both speakers use our ULT POWER SOUND technology to deliver massive bass, the ULT TOWER 10 provides a bigger, more intense sound experience overall. The ULT TOWER 10 is our "top of the line" model. It features a larger build and is designed to fill even the biggest rooms with massive bass and 360° Party Sound. By comparison, the ULT TOWER 9 is a slightly smaller alternative. It still packs a serious punch and uses the same ULT button to switch between deep, low-frequency bass and powerful, punchy bass, but it is a step down in total power from the 10. If you are looking for the absolute maximum bass and volume we offer in this series, the ULT TOWER 10 is definitely the way to go. If you'd like to explore more specs and features of both speakers, please use the following links. https://www.sony.com/electronics/support/speakers-wireless-speakers/srs-ult1000/manuals https://www.sony.com/electronics/support/speakers-wireless-speakers/srs-ult900/manuals We really appreciate you thinking of Sony for your purchase! Best regards, Estefany
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