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In the Forum: Horn-Loaded Speakers
In the Thread: How to USE “Resonating Oops” in loudspeakers
Post Subject: Time alignment and OOPS!Posted by drdna on: 12/5/2007
 Romy the Cat wrote:

 Winnie wrote:
In talking with Shelly Katz a few days ago ... he said [that] with Layered Sound there is no need to time align drivers, the 'signals' being delivered from the panels are not compromised by being out of time alignment by a few milliseconds ... They will contribute hugely to the overall picture even though they are not in perfect focus ... If you have (say) a horn speaker that is in perfect focus acoustically then it does not matter if the oops effect or indeed the panel speaker is some way 'out of focus'.

What Shelly Katz is saying might be valid ONLY in case is his loudspeakers are being use as ONLY source of sound. ...if the Layered Sound speakers is being used as an Injection Channel complimentary with other (presumably time coherent) acoustic system then what Shelly Katz stated is completely false. Furthermore the analogy with the car and the sense of sight is absolutely not applicable and frankly speaking I am surprise that he even brought such a bogus illustration.
I would agree with Romy that for ANY Injection Channel use, time alignment is critical.  However, it seems the use of layered sound is to primarily simulate hall/room reflections to make a artifical "ambience."  In this case, we actually want the time alignment to reflect the creation of delays of reflections we want to simulate.  In a complex acoustic space, it might be almost random and obviate the possibility of realistically doing this.  Essentially, lack of time alignment to create these reflections with panel speakers emulates the reflections of a complex or maybe homogeneous acoustic space.  The purpose here I think is very different from use of an Injection Channel.

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