Hi there. I don't know if you remember me, I bought a pair of AR9's from you few years ago. They are great no problems so far with them, and thanks for that. This PT-2400 would be great if it has BY-AMP connection on it. My AR9's need a lot of power to drive them and I think this one would have the power I need for them. Was this amp upgraded in any ways? If it was please let me know what was done, and I would also like to know what year it was it made. Please let me know asap. Thank you.