Two SVS related questions: 1) How do I know that an SVS sub has the ISD driver? Is there a date after which SVS subs were made using the ISD driver? Distinguising features that are visible so I can tell it's the ISD versus the old one? 2) Would I lose out on much if I paired a CS sub with a monoblock amp, am I going to lose out much by not having a phase control, etc like a plate amp would? Will I lose anything in sound quality by using a PartsExpress plate amp (or something similar) versus a high quality monoblock?