Normal
Re: Flown Subs, Ground Bounce, and People in 1/2 spaceTo put that ground reflection in perspective, imagine subs 2m off the ground, and a really tall listener with ears 2m off the ground, standing 10m away from the subs. The path length difference is going to be 2x(sqrt(5x5+2x2)-5)=0.4m. A half wave of 40cm puts you up around 400Hz for the first full cancellation. There will still be summation below 200Hz. As the listener gets closer to the speakers the first cancellation frequency will get lower, but if the heights of the sub and listener are lower the frequency will go up. I don't think cancellation due to ground reflection from subs that are not right on the ground is a real issue. In a crowd, absorption by bodies standing in front of the subs is probably a bigger issue.Mac
Re: Flown Subs, Ground Bounce, and People in 1/2 space
To put that ground reflection in perspective, imagine subs 2m off the ground, and a really tall listener with ears 2m off the ground, standing 10m away from the subs. The path length difference is going to be 2x(sqrt(5x5+2x2)-5)=0.4m. A half wave of 40cm puts you up around 400Hz for the first full cancellation. There will still be summation below 200Hz. As the listener gets closer to the speakers the first cancellation frequency will get lower, but if the heights of the sub and listener are lower the frequency will go up. I don't think cancellation due to ground reflection from subs that are not right on the ground is a real issue. In a crowd, absorption by bodies standing in front of the subs is probably a bigger issue.
Mac
