Using Speaker Impulse Responses for Mix Portability?

[vo1k1]

Mixing for portability across a number of playback systems and environments is a struggle for me (e.g., the feedback loop between trying a new eq setting and auditioning in the car is brutal).

I started using the following technique, which is pretty nice for getting a good percentage there, without the pitfalls of dashing to every audition environment.

Load Speaker IRs into a convolver as the last plugin on the mix buss.

Is this obvious? Do many people do this? I've not read about this, so it seemed like a nice tip to share!