I have shipped Krell 250 amps, Wilson Benesch Chimera speakers, shipping them is not a big problem. All you need to do is make sure the items are properly packed, documents in order, item country of origin, invoice and a good logistic company that has an agent in Shanghai. If the importer is working in Shanghai, has a work permit, so much better to import. If you are selling to a local resident, he needs to appoint a forwarder to do it and that may be problem. Fedex will do the amps, huge speakers as well. A bottle of scotch and a carton of cigarettes attitude does not work these days in China.