Is there such a think as a multi zone pre rather than power amp?
It is a Line Level Audio Distribution amplifier.
Having owned clubs, you want to go MONO. No one is ever in the sweet spot so it always sounds off balance or muddy. Also, you are best off with a lot of smaller speakers. If you went with just a couple of large speakers some people will get blown away while others won't hear enough.
I'm not in love with the sound quality of commercial amps but they do take abuse well. I have literally melted home audio amps after several months of constant use. The same can be said of impedance matching transformers/selectors. Niles makes 8 pair selectors that can handle the current and your amps will only see 8ohms.
Ideally for me: Bluesound node into a pair of crest amps to an 8 speaker (or more) selector. All running mono. Some strategically placed subs will help. People love some "thump". Keep in mind that employees always thin they are smarter and will keep blowing your system. Zone volume conrols are vital to keeping it all smooth and even.