ok ive read that for setting gains with a dmm you should have all settings at 0..ive also read that for an alpine that +15 on the sub output level is actually 0.. and that for alpine headunits you should set it at 15/15 when setting gains with a dmm.. is this the same for eclipse headunits also? mine goes up to 6.. should i leave it at 0 when setting the gain or put it at 6?