Hi Guys, Anyone has both AU 7900 and AU 7700 Amplifier ?? There is one for sale but when i did a comparision on the spec n features it look like most of the data are same. Only the power rating of the AU 7700 is less 58 w * 8 ohm while the AU 7900 is 70 w * 8 ohm. Does both have the same sound signature or it is totally different beast. The looks of both amplifier is very samiliar too.