Is it compatible with the 55ub820v-zh

Not familiar with LG range but from a quick look at specs there should be an optical output that , from my Samsung experience, works well with the sound bar and an optical ‘cable’ is included with the purchase. Hope that helps.

I have heard that Alexa's voice volume cannot be adjusted in the sound bar and may-be too loud at times ? Is this true ?

I have the sound bar in a medium sized bedroom and I personally think the alexa voice level is just about right.

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Description

🎶 Transform your living room into the ultimate sound sanctuary!

CRYSTAL CLEAR DIALOGUE - Clear Voice technology ensures you never miss a word, even during intense action scenes.
SLEEK SPACE SAVING DESIGN - Compact 89cm soundbar fits perfectly under any TV or mounts on your wall for a clean setup.
IMMERSIVE 3 D SURROUND SOUND - Elevate your home cinema with DTS Virtual:X for rich, room-filling audio.
HANDS FREE ALEXA INTEGRATION - Control your TV, smart home, and streaming with just your voice—no remote needed.
SEAMLESS BLUETOOTH STREAMING - Wirelessly connect devices up to 33 feet away and stream your favorite playlists effortlessly.

The Yamaha YAS-109 is a sleek, 120W active soundbar featuring DTS Virtual:X 3D surround sound and built-in Alexa voice control. With Bluetooth streaming up to 33 feet, Clear Voice technology, and versatile connectivity including HDMI ARC and optical input, it delivers premium audio performance and smart home convenience in a compact, stylish design.

Specifications

Surround-sound channel configuration	DTS® Virtual:X™; DTS Digital Surround; Dolby Pro Logic II; Dolby Digital
Colour	Black
Included components	Sound bar, Remote, Power cable, Optical digital cable, Spacers, Mounting Template, Quick Start Guide, Safety Brochure
Item weight	3.4 Kilograms
Is waterproof	False
Warranty type	Limited
Maximum range	33 Feet
Number of items	1
Control method	App
Wireless communication technology	Bluetooth
Speaker size	33 Feet
Power source	Battery Powered
Product Dimensions	13.1 x 89 x 5.3 cm; 3.4 kg
Item model number	YAS-109
Speaker Amplification Type	Active
Speaker Count	1
Colour Screen	No
Wattage	120 watts
Item Weight	3.4 kg

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