I have an audition tonite First one in a long time! Here's my dilemma: the keyboard player has offered me a unknown keyboard amp w a 15' speaker (that is all I know). I would rather bring my hartke 5000 with a 2x10, but am concerned that he might take affront to my dissing his amp by bringing my own. Also, the studio is in a basement, and space may be an issue. What should I do?