Problem 
Distorted audio.
Solution 
Check that gains are set correctly. Inspect speakers for damaged cones or bad voice coils.
Problem 
Amplifier fuse keeps blowing.
Solution:
Check all power and signal wires for a short. Make sure power and ground wires are correctly connected to the amp.
Problem 
Whining, ticking, or any other unwanted noise present in system when engine is running.
Solution 
Amplifier may be picking up alternator or radiated noise. Make sure all signal wires are separated from power wires. Check all signal and power wires for a sold connection. Check all ground wires to make sure they have a solid ground.
Check alternator and/or voltage regulator for solid connections. Check battery for adequate voltage and connection.
If you have any questions or need added help with your new D3 Amplifier, please feel free to call Diamond Technical Support at
SYSTEM DIAGRAMS
The Diamond Audio D3 400.2(Fig.5 to 7)and D3 400.4(fig.8 to 13)2 and
Bridged-Mono Subwoofer System
D3 400.2
Low HIGH FULL
Fig.5 In this application the amplifier is bridged for mono operation to drive a subwoofer
5