have just done a daft thing. bought a pair of large air horns of e bay. checked with seller who told me they were 12 volt. they arrived but had no compressor with them , (which the seller informedme). i bought a cheap set of air horns just to get the compresor. when i connected them up,they made very little sound but blew the boats fuse/ on inspecting them i noticed they had 24 marked on them, so i presume they are 24 volt. can anyone suggest how i may be able to get them to work. also is the small compressor big enough to run a large pair ?