LiL PiNoY Posted December 17, 2012 Report Share Posted December 17, 2012 What's the difference and which setting should I be using. It won't let me change to flat setting and I have to use one if them. It is an alpine cde hd138bt. I have a complete sound system ( 2 pairs of interiors hooked up to a 4 channel amp and 2 subwoofers each having their own amp) One pair of my interiors are hooked up to crossovers but I do not know what the settings were put at. Link to comment Share on other sites More sharing options...
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