Mike Berry wrote

>The other issue is how the resulting impulse response is affected by the
>walls of the room rapidly accelerating away from the microphones.  Expanding
>universe-like doppler shift.  Which brings up the use of extremely dense
>matter, to both generate the impulse and balance the forces that are causing
>the walls to accelerate.

But then there's the age old question: "But how does it sound?"

tolve