Hi.
when doing sound systems at summer festivals, i've often noticed the 'power alley' up the middle, and similar cancellation 'alley's'. How can these be predicted / mapped? and can the distance between stacks be optimised to maximise cancellation of the 50/60hz 'thump' in the sideways direction? I'm thinking that if the speakers were 0.5 1.5 or 2.5 x the wavelength of 50/60hz apart, then the omni-directional bass wave from each stack would be out of phase with the other stack, as it passed it. this sideways cancellation alley could be aimed at the nearest village, to minimise noise complaints from neighbors (too loud) and the dance floor (too quiet!).
I've just lost a very good job to a competitor, as i wasn't prepared to do a '6 stack noise cancellation system' despite :
1/having the best sound at last years festy
2/our stage not causing any of the noise complaints
3/being the preferred sound system of the promotors of the stage
I've looked after multi stack systems before, & i promised myself i'd never do it again!
I'm sure the council loved to hear about all the super duper cancellation technology blah, but my responsibility is to the dance floor, and i'm trying to reproduce stereo, not a train crash.
pleeez help meeeeeee!