I have a blown JL Audio 10W7 for sale for 50 bucks plus shipping. It is perfect and will do great with 600 watts. If you send it back to JL Audio they can recone it for you and it will be brand new.
I have a blown JL Audio 10W7 that I'm looking to sell for 50 bucks. You can send it out to be reconed by JL Audio. They are 500 watts RMS and get loud when you want them to!