If you guys are looking for mp3 players, I would highly recommend Kenwood Z828! Although the HU cost around 400-450, but it's not a big deal if you calculate it back, it's has 4 set of preamp output with 4.5W, aux in , 47 WATT Peak, HPF and LPF, X-over, ESPECIALLY IMPORTANT---EQ---(cost around 100-200) if you think it backward with EQ, CD changer, AND HU, it will cost you more that 650!!!! NOW! you can get it for only 400-450, why not pay more for now and enjoy it for a longer time instead of buying a HU again and again! I am currently owning one that I bought from Hong Kong, it's round up to 380, so I really recommended you to give it a shot!