I'm going to check out some CF-4's later today. According to the seller, they were recently put in a storage unit so auditioning them may be difficult. It's about an hour drive as well. I am going to bring my little Kenwood KA-5700 integrated, i-pod, speaker wire and a long a** extention cord. Hopefully there is an outlet close by. I know to check for the originality of the drivers and operation. I also know the early versions have deeper ports and are more desireable. Anything else I should look for?