If it's the same as last summer, then they will offer all of the 3 above (plus 1-2?) because some of their incoming class needs to complete all of the prereqs. I took Audiology at Emerson last year during the second session. The class met twice a week (6 weeks total) as it's a four credit class. I believe their "Speech Science" summer course is called something like Acoustic Bases?
FYI, I'm taking Speech Science through distance education at Utah State University, and it's pretty good for an online course. Work load is manageable. I think you'd learn a lot more at Emerson, NEU, or MGH, and be more challenged, but it's a nice option to consider.