Just pasted this straight out of my microphone & loudspeaker module reading list.
Colloms,S.
1991
High Performance Loudspeakers
Vance Dickason
1991
The Loudspeaker Design Cookbook
John Borwick
1994
Loudspeaker and Headphone Handbook
Robertson, A
1963
Microphones
Rossi, M.
1988
Acoustics and Electroacoustics
Frederick V. Hunt
1982
Electroacoustics
Only one I've read is the loudspeaker cookbook and it was alright. Never really got interested in this area though.