These optional mounting spacers allow you to install the SM Series speakers on your boat with versatility and ease — supporting installation in a variety of positions for a professional finish. Similar to the SM Series speakers, these spacers are available in black or white (sold separately).
 
Physical dimensions (WxHxD)Surface Mount Spacer: 6.19" x 6.19" x 0.87" (157.3 x 157.3 x 22 mm)
Two Surface Corner Spacer: 6.10" x 6.10" x 1.22" (155 x 155 x 31 mm)
Three Surface Corner Spacer: 6.10" x 6.10" x 1.38" (155 x 155 x 35 mm)