Shipping companies

Can someone recommend a shipping company to ship speakers from Spain to the US. Air freight?

Cake:  google "freight forwarders".   they all usually have a network of companies that they work with.  Whichever company you decide on, they can arrange door to door service, for a price, of course. Be prepared to pay a customs clearance fee as well. 
Until the Covid19 crisis is over I doubt you’ll be getting anything out of Spain. My sister lives over there and that place is locked down tight.