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<blockquote data-quote="Ivan Beaver" data-source="post: 109591" data-attributes="member: 30">Re: Lumbar Array?There have been various noise cancelling projects done over the years.&nbsp; Tom Danley has been involved in several of these.&nbsp; But they have all been low freq.&nbsp; It gets WAAAYYYY harder as you go up in freq. HOWEVER they can only be done generally in one location or one direction.&nbsp; This is because the path lengths will be different at different seats.I knew a sound guy once who said he could cancel out the rear wall reflection using a digital delay.&nbsp; And he could-to a certain extent-it was reduced a good bit.Basically he would adjust a digital delay (that had the whole mix on it) and invert the polarity-to the signal arrival from the back wall to FOH.THE PROBLEM was that it only worked at FOH (and other seats that had the same physical distances.&nbsp; All the other seats got worse.So it depends on what you are trying to do and what is most important.It is one thing to add reverb to a space.&nbsp; That is pretty easy and there are a number of systems out there that work quite well.But taking it away is one I have never heard of.&nbsp; I would think there would be a HUGE market for that (MUCH MUCH greater than the ones that add reverb to a room).</blockquote>

[QUOTE="Ivan Beaver, post: 109591, member: 30"] Re: Lumbar Array? There have been various noise cancelling projects done over the years. Tom Danley has been involved in several of these. But they have all been low freq. It gets WAAAYYYY harder as you go up in freq. HOWEVER they can only be done generally in one location or one direction. This is because the path lengths will be different at different seats. I knew a sound guy once who said he could cancel out the rear wall reflection using a digital delay. And he could-to a certain extent-it was reduced a good bit. Basically he would adjust a digital delay (that had the whole mix on it) and invert the polarity-to the signal arrival from the back wall to FOH. THE PROBLEM was that it only worked at FOH (and other seats that had the same physical distances. All the other seats got worse. So it depends on what you are trying to do and what is most important. It is one thing to add reverb to a space. That is pretty easy and there are a number of systems out there that work quite well. But taking it away is one I have never heard of. I would think there would be a HUGE market for that (MUCH MUCH greater than the ones that add reverb to a room). [/QUOTE]

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