| Re: Interrupting Impulse Response
Could you post the impulse responses with dB FS? It'd be easier to read. It's the Energy Time Curves that you wanna plot in %FS and will have more meaning as it pertains to acoustical treatment.
Basically, the impulse response is showing you the magnitude of sound pressure level as it changes with time. Everything you see to the left of the impulse peak (which sould be centered at time=0) is going to be distortion. Basically the program sends a sweep to the speakers to ensure that they play every frequency and then squishes the response back together - pretending as if every note played at the same time. The result of this is that higher frequencies present when the lower frequencies are playing will get shifted to the left - arriving before that frequency should be arriving. So basically everything to the left can be ignored.
To the right, we're going to see all sorts of things. We'll see the arrival-time differences between drivers, any undamped resonances in the drivers/cabinet, reflections throughout the room, and even resonances of the room.
-Mike Bentz ~It's all about compromise~ "It's territorial with the soundboard. So you're mixing and some dude comes by spewing opinions and trying to turn knobs. It's akin to going up to an artist and painting over his unfinished masterpiece. You just want to shove your paint brush up his nose and throw the soundboard out the window!" |