Re: Diamond Audio M661 or S600a's?
i dont know about the M6, but the HEX are 6" mids. the M6 now come with silk tweeters to (if you buy them authorized, you will probably get one of the latest sets with the new tweeters). i paid like $400 for my HEX, and i love them, but i think the M6 is a great set of speakers too, if you are tight on cash, get the M6's, you will love them.
2005 Honda Accord EX Sedan
JL Audio Cleansweep, JL Audio ZR650-CSi, JL Audio 12W3v3 in custom stealthbox like enclosure in trunk, JL Audio A6450, Audiocontrol DQXS w/DDC
Sony 32" XBR BRAVIA LCD, Toshiba HD-A1 HD-DVD Player, B&W 704 Floorstanders, Rotel RC-1070 Pre amp, Rotel RB-1070 amplifier (130x2), Rotel RCC-1055 5 Disc Changer, HTPC as music server and PVR, and XBOX 360.