AU-D7 is 80wpc and equivalent to Jap model AU-D607F, which you can buy at the pier probably from P3.5K to P5K. since the AU-D7 is an international model, it's parts are expected to be slightly inferior to the D607, and that would also have a bearing on the pricing. there's a possibility, however, that the 607 unit sold at the pier was already repaired, so, another consideration. bottom line is decide based on your priority. sound, looks, price appraisal, serviceability, etc.