I copied this from another thread, I think it is something everybody needs a reminder, especially now that so many people are using the DD-1 as well as using it as a defense when members on the forum are telling them they clipped their woofer.
The DD-1 is a great tool for the average consumer to set gains consistently and accurately. But, a DD-1 is not an end all solution to never clipping your woofers. Different songs are written at different levels, some include clipping from the start and some don't. It is the users responsibility to be "in tune" with their setup and recognize when they are pushing to hard and adjust.
For example, I've watched the man Steve himself alter his levels constantly depending on song and frequency. He had excellant attention to detail, constant monitoring of the health of the setup, and he controlled the system variables. I'm sorry (OP of the thread who blew a woofer) thought this woofer was indestructible and using the DD-1 was definitely a good move now you need to refine these skills by using the DD-1 with the right tones (I used 40hz -10db for my Scope) and constantly improving on how you are controlling the system.
-Drew
**Remember, woofers and amps are stupid. They only do what they are told and you are the bus driver on this road to DBs**