Mac amp?

[Bouncing Account needs new email address]

High-power amplifers are not small.

There are many small amplifiers, but not to power large speakers.

And, are you saying you want the USB (or other) port on the MAC to power the amplifer and speakers?
Not gonna happen.

You COULD, however use large powered speakers (some can be battery-powered).
There are plenty on the market.
Most are used as portable “hotel ballroom” PA systems.

[Andkin]

Any speakers that you would use in an editing room should be near-field monitors; high fidelity reproduction of the majority of frequencies at a wide range of volumes but with a very short “throw” or distance from the monitor. Near-fields come in active versions with amplification built in, each speaker requiring an AC connection and passive versions that must be driven by an amp but don’t require AC.

For any public address system for the venues you are referring to you would require some kind of separate PA speakers that should be driven by an amp, although there are self powered PA systems out there if you go to a full service music store that deals in PA systems. Editing with speakers like this would be a harsh auditory experience as they are designed to be loud and to fill large spaces.

Wireless speaker systems that you allude to do exist in the consumer hi-fi world and might fit your bill but they do use signal compression to get the data over the air so quality is an issue.

ak