To be honest I was about to get the DD-1 but one day I realized how important it was to set the subwoofers to 80Hz and gave it a try to set it to 80Hz. Only to find that almost all class D amps don't ask you to crank the Hz knob as far as it can go. So I figured I was pretty close to 80Hz. Once I set it to 80 with this tool, it was a whole new world. I was around 55 or 60 years old for that long and missed music so much. It really changed the rules of the game. Then of course there are the maximums, this gives you the ability to set your maximums to whatever you want and you know that it's the right bang for the buck. If you have this, a DD-1 and a good Fluke multimeter,
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