: If the unit fails to power on, check the 14A protection fuse . Always replace it with a fuse of the exact same amp rating as specified in the U15a User Manual .
: Ensure the voltage selector is correctly set to your local standard ( 110V/220V ) before powering on to prevent blowing the internal protection fuse.
: Features a 15" high-power low-frequency (LF) transducer with a 50mm voice coil and a 1.7" diaphragm compression driver for high frequencies (HF).