US Customs & Border Protection:?
Typically customs do not bother about outgoing items unless they are guns, drugs, gold, etc. CBP should have no issues with a hi-fi system. In India the item needs to fit into an overall duty free allowance of 45000 rupees. Please have the bill handy. If it's over the exempt amount then you may have to pay import duty at applicable rates. Thanks User-10964698385321382911 for pointing out that this was an answer and not a comment. But in my excitement I think I deleted his comment and up vote also. Apologies!