Typical goals of both rooms are to avoid strong early reflections, tighten up the low end, and create some kind of diffuse return.

However, with mixing rooms critical listening is essential, so clarity and neutrality is often given higher priority, while an audiophile listening room may place greater emphasis on envelopment and and tolerate higher decay times to provide liveliness.

Common differences:
– More common to see sidewall diffusion in hi-fi rooms. Mixing/control rooms, especially small ones, are more likely to use pure broadband absorption at the sidewall and ceiling first reflection points to create a well defined reflection free zone and initial signal delay (ISD) gap: http://arqen.com/acoustics-101/reflection-free-zone/#itdg
– More common to see heavier duty bass absorption in mixing and control rooms.
– More common to see lower decay (“reverberation”) times in control rooms.

I’m going to mention a few specific room types you can look up if you’re curious…

A control room designed using the Refection Free Zone (RFZ or LEDE) criteria, with lots of diffusion, would also make a very pleasant audiophile listening room. Other control room concepts that would work are Controlled Image Design (CID), Early Sound Scattering (ESS) and Ambechoic. Any of these concepts could be applied to create a blissful sounding hi-fi room.

However, modelling a hi-fi room after a Non-Environment (NE) control room doesn’t make sense. For pleasure listening it would be excessively dry and clerical, and to achieve a balanced sound in such a dry room is very expensive and requires sacrificing much of the room’s volume for bass absorption.

There are different schools of thought for control / mixing rooms, and some are more relevant than others for audiophile rooms:
-A design that tries to force the room to become completely neutral by absorbing everything (like an NE room) is the wrong approach for the sane audiophile.
-A design that works with the room to achieve a balanced sound (like an RFZ room) is the easiest and most affordable path to high fidelity bliss.