[sdiy] reverb mad from multiple delays

[Steve Carter]

It's interesting to see that Barry Blesser is considering thermal  
variations in the air and the effect on the speed of sound.  A useful  
link for a calculator on this is  http://www.sengpielaudio.com/calculator-airpressure.htm

Another factor with audio reproduction is the transmission efficiency,  
or coupling, between the movement of air by a loudspeaker cone and the  
human ear.  This is very much frequency dependent and the air  
temperature and humidity affect quite considerably what the ear hears  
from the loudspeaker, especially in a 'live room' situation where  
surface reflections 'amplify' these differences.  Listening to the  
same mix of a song in the control room of a non air-conditioned studio  
at the end of a session when the room is dry and warm, can sound very  
different when the room is damp and cold even allowing for the  
psychological difference.  It's an interesting topic and a factor that  
is often overlooked when working with audio.

Steve

> Sean Costello is a DSP reverb guy who has blogged a bit about the  
> sound of old digital reverb units. There might be some info to point  
> you in the right direction. Maybe start here:
> http://valhalladsp.wordpress.com/2009/07/30/modulation-in-reverbs-reality-and-unreality/
>
> There are some other posts he made as well with good info and links  
> for further research...
>
> -Chris
>