I just bought the SVT-7 Pro head used from Guitar Center (excellent condition) I watched a video talking about how to adjust the gain, by turning everything flat and master down while playing turn gain up until it peaks then back it off. I used the -15Db because both my basses are active. should i use the compressor to help keep it from peaking with the gain up? i have the SVT410HE 8 ohm cab 500/1000. I did notice that here and there even with the -15Db on it would clip with gain down. also the headphone jack seems to not work correctly if i plug all the way into the headphone jack I get no sound, but if I pull out a little bit it works fine. I bought the Pro Coverage Warranty ( 2 years )