I might be tempted to leave it stock just to keep it original. I think the price on those amps have gone up quite a bit due to the Jack White connection. You would have to change the baffle I'm assuming. A speaker change probably would give you a lot more bass. Look up wiring diagrams online. If you know how many ohms each speaker is and how many ohms the amp needs then just google "series" or "parallel" speaker wiring find out which one you need in order to match up the ohms and you're good to go.