The Horn1 has two plates. One is attached to the Horn itself and the other will hold the driver and be will attached to the first one. If your Horn1 came with the first plate already attached, detach it so you can insert the Horn1 into the cutout in the baffle.
Insert the Horn1 into the cutout (From the front part of the baffle) and tighten the six #8 2” screws.
Connect Rear Plate
Connect Rear Plate #1 with two M6 T-nuts. The two dowels should face the rear.
Screw four #8 2” screws through the 4 holes in the plate onto the back of the Horn.
Compression Driver
Mount the compression driver on the second plate with four short M6 bolts.
Mount the plate with the driver to the plate on the Horn1 with the two long 6 bolts. That’s it. Continue with installing the woofers.