30" Length, 9" Width, 4" height 

Available space underneath:
30 x 9 x 4 tall - available space is 28 length, 9 width, 3 1/4 height

The ideal riser for:
1)   The Bose Smart Soundbar 300
2.21 inches (H) x 26.58 inches (W) x 4.02 inches (D)

2)    The Bose Smart Soundbar 600
27.3" wide, 4.1" deep, and 2.2" high

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The Soundbar Riser stand #2086 is made from solid hardwood, stained with MinWax Polyshade ,and finished with a protective satin water resistant finish.  This produces a solid black color.
The stand is 3/4" thick, with a slightly rounded edge on the top. All stands can support 150 pounds.