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i was on a different forum, looking around and someone posted about the dd-1. really a lot of negetive things said about it..here is one message post about it...this does not make sense to me tho, seems he dont know what he is talking about..i can post more info if you want.. You can set up gains with the amp unloaded - results may vary, it's generally ok on lower powered amps where the limitation is the voltage rail inside the amp. Probably not the best idea for high powered setups where voltage droop is a real issue. In all of Steve Meades videos he sets up amps unloaded with a DD1. I don't really agree with this since his target market is people with ground pounders... He also uses a -10dB tone (on recommendation from Rockford Fosgate) to set the gains on sub amps which is completely wrong and will cause up to 10dB of clipping (A LOT) when the headunit is at full volume. The bass lines in modern recordings are around -1dB peak, so a 0dB tone should be used to set sub amp gains. For mids that are highpassed above 100Hz you can push it out to about -10dB, and -15 or -20dB for tweeters. Clipping isn't very audible in subs, so he probably doesn't realise what he is doing (that and he is big headed and won't accept that his methodology is wrong). I always get the feeling when watching SMD videos that he doesn't really understand the science behind what is going on.