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In the Forum: Horn-Loaded Speakers
In the Thread: Macondo's Axioms: Horn-loaded acoustic systems
Post Subject: How to "flood" the crossover pointPosted by Romy the Cat on: 8/5/2007

 stuck.wilson wrote:
In this thread, you previously said--

12) If a filter requires a phase inversion then it is preferable to flood crossover point with amplitude and do not invert phase.

What exactly do you mean by this and how's it work?

It is it not a widely used method and some, particularly academia-type people would consider it heresy. However, I do not think that there is such a thing as heresy it heresy delivers better result.

The crossovers of higher order (second) introduced 180 degree phase shift and it is a common practice to use opposite polarity of bottom and top channels. However, in some instances (not all time, and I never was able to successfully implement with tweeters) I came to observations that even use of polarity-inventing crossover but without physical reversing of polarity does serve positive results. Without reversing polarity and use of 180 degree phase shift we will have a suck out at crossover point. Nevertheless, in context of multichannel installation, where each driver works in a narrow range, it is possible to increase amplitude of one channel, and by means of it to flood-out the sucked-out at crossover porn. Interesting that this methodology still might have some residual none-linearity of response but there is something more important than linearity. If forget about linearity and to use imaging-centric crossover building techniques than in some cases the benefits of none-inversion are clearly auditable. In fact, I believe I have written on my sides about that before.

The method was not invented by me, it rather my common sense know-how that I recognize as part of normal design process. Initially it was implemented by Yamaha loudspeaker in the end off 70s, and its was were I took the inspiration from. Later own looking at others people’s “better” crossover designing techniques (that have little to do with what books suggest) and discovering my own channels integration techniques I recognized that no-inversion method should not be take out of consideration, and if it is employable then it should be utilized.

Rgs, the Cat

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