I recently shipped a set of speakers from Central CA to Texas using a company called Craters and Freighters. The speakers weighed 600 lbs and shipping was as I recall $550.00 which included picking them up at my house and building custom crates. They do have a website which you can get an online quote but be aware the online price was about $350.00 above what I got quoted on the phone. Definately call them for a price. Hope this helps.
Good Luck!
Good Luck!