Key Specs Voice Assistant Built-in Amazon Alexa Bluetooth Enabled Yes Input(s) Toslink optical, HDMI, Subwoofer Works With Amazon Alexa Compatibility Voice Assistant Built-in Amazon Alexa Works With Amazon Alexa General Product Name 2.1-Channel Soundbar with Built-in Subwoofers and Alexa Built-in Brand Yamaha Model Number YAS-109BL Color Black Color Category Black Audio Surround Sound Supported Dolby Pro Logic II, Dolby Digital Minimum Frequency Response 62 hertz Maximum Frequency Response 23 kilohertz Connectivity Bluetooth Enabled Yes Input(s) Toslink optical, HDMI, Subwoofer Number of HDMI Inputs (Total) 1 Number Of USB Inputs 0 Number Of Optical Audio Inputs 1 Output(s) HDMI, Subwoofer Number of HDMI Outputs (Total) 1 Video Video Pass-through 2160 (4K) Feature App-Controlled Yes Speaker Number Of Tweeters Included 2 Tweeter Size 1 inches Number of Drivers Included 6 Driver Size 3 inches Number Of Woofers Included 2 Woofer Size 8 inches.