RCF HDL 12-AS Owner's Manual page 23

2. Select the inclination angle (positive angles indicate a lower inclination of the speaker) and secure it with the rear quick lock pin "P".
3.1 STACKING ON DIFFERENT SUBWOOFERS (OTHER THAN HDL12-AS)
P
P
R
1. Screw all three plastic feet "P".
2. Secure the flybar to the safety bracket using the linchpins "X" and block them with the cotter pins "R".
3. Adjust the feet to stabilize the flybar on the subwoofer then block them with thieir nuts to avoid unscrewing.
4. Assemble the HDL6-A speaker with the same procedure.
P
WARNING: ALWAYS VERIFY THE SYSTEM SOLIDITY IN EVERY CONFIGURATION
C
1. Screw the safety bracket "C" to the M20 insert on the subwoofer
P
P
P
R
WARNING: ALWAYS VERIFY THE SYSTEM SOLIDITY IN EVERY CONFIGURATION
X
C
X
P
C
X
X
X