I don't believe Mac amps are most well known for their dynamic sound. However it depends on the component type and era.
The newer power amplifiers are nicely dynamic if driven with a clean high gain preamp, preferably a class A triode tube pre.
The reason is that they made an effort to increase the capacitance of the dynamic storage caps.
My MC312 lists that as an upgrade in their product literature for example. It is superbly fast as well as transient and macro dynamic.