I own several active basses, all of them high end (USA Spector, Status Graphite, Alembic, MIJ ESP), and the preamps in all of them (except the Alembic) never seem to work. It is obvious that something I am doing is causing this, but for the life of me, I don't know what it is. It could be that I leave them unplugged and with the battery in most of the time, but that doesn't seem likely. Any ideas on how I could be killing my actives so quickly? I am almost about to go all passive!