Pioneer GM-D8604 Owner's Manual page 13

Installation
3 Install the amplifier with the use of
supplied tapping screws (4 mm × 18 mm).
3
4
1 Tapping-screws (4 mm × 18 mm)
2 Drill a 2.5 mm diameter hole
3 Floor mat or chassis
4 Hole-to-hole distance: 257 mm
5 Hole-to-hole distance: 181 mm
1
2
5
Section
04
13
En