last i recall, like jack\squeak said, the parthenon can do 6" and more of xmax. actually, i recall a post made by eaither dan w. or steve k. saying that it is totally upon request driver, (iirc the neighborhood of $5~7k) and can basically do whatever you want. if you wanted 8" one way, im sure they could prolly squeeze it out //content.invisioncic.com/y282845/emoticons/laugh.gif.48439b2acf2cfca21620f01e7f77d1e4.gif
imo, the parthenon wins this "battle" because its BEEN made, even though its not a 'production sub'
but this battle is completly usless because this one spec does not figure all aspects of every application //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif
its like saying, what car has the hugest tires? //content.invisioncic.com/y282845/emoticons/laugh.gif.48439b2acf2cfca21620f01e7f77d1e4.gif