It depends on the size of the group and (term) duration of instruction. I live in a tourist town so it’s a big benefit to offer a price per class based on numbers signing up for a given period of time. Small community residents aren’t here the entire year. For example: over 10 people for 1 hour aqua for 6 weeks (1 class per week) people pay only $8.00 per class for the 6 weeks. (very inexpensive per person) This = $80 for you. Then “drop ins” can pay a significantly higher price, say $12.00 which then encourages sign up for the series.
Many private hire developments like this allow for you setting your own price.
However, if it is a situation where you are working with their “fitness” manager or IC for the FACILITY, then you would be looking at flat fees per class paid by the organization or club. I’d also be careful about agreeing to less pay if there are less group participants or a day of no shows. Lots of communities or organizations will attempt to say they will not pay. Often where I live attendance might be low given the time of year and is NOT representative of any instructors skill or class content. Personally, I’d never agree to that. It’s a brutal drive through traffic anywhere and if nobody shows for class I’d expect to be paid for my time nevertheless.
As far as Music and Mic: I have a loud voice, and often work the room while teaching (rather than on stage in front) so I never worry about a mic unless teaching spinning. Pilates and aqua I dislike a mic too and only find it necessary with very large (over 50people) groups. I also bring my own speaker (small travel, light and loud Boze) with me everywhere to avoid time wasted.
While there are many variables here: location, format, attendee volume, IC, etc. There are many options for you. See what will work best for you and offer the attendees something valuable for the price paid. Then everyone benefits. 🙂
Good Luck! Kimber