Hai frnds. This is siddharth frm tamilnadu.. After a gap of nearly 1 year I am back to our site. Through the suggestions from our fellow frnds I bought and using marantz nr1506 with polk rti a3 bookshelfs for last 1year. I am really impressed with its sound quality.. Now I decided to upgrade. For that I need buy a sub or I may go for tower speakers. Fingers crossed.. Suggest me frnds. Thanks in advance..