KV2 Audio EX10 - Manual (Page 9)

The EX10 horn can be rotated ninety degrees in order
to accommodate applications where the speaker will be
used or installed horizontally.
This can be accomplished by removing the front grill.
Removing the horn, rotating and replacing the horn.
Replacing the front grille.
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EX10 USER GUIDE P. 9
CHAPTER 3: ROTATING THE EX10 HORN