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In the Forum: Horn-Loaded Speakers
In the Thread: Adding one more spherical to Macondo.
Post Subject: The new channel, phase plug and the objectivesPosted by Romy the Cat on: 8/14/2006
 cv wrote:
Little suggestion should all else fail - you could have a rudimentary phase plug machined that would give you the same (or similar) compression ratio as the original but only one annular exit path. This might preserve the driver characteristics at LF but attenuate HF.

Chris,

I was considering it but I do not know if it is would be necessary. The idea to try the S2 without the phase plug came to me last year when I was looking at the Cogent LF compression driver and the complicated metal work they put in the manufacturing of this plug. I asked myself why the hell the phase plug is necessary at all if the driver does not men to handle any HF? In case of the Cogent/RCA driver it very much might be the case as they have flexibility to maintain the compression ratio and to implement a different diaphragm-loading method (since the driver is manufactured form ground up). However, in my case, since I bound to S2 design I have to stay with what it is. To make a different plug is possible but the main question would be what kind? If I have a friend next door with ultimate patience and a machine shop or a turning machine in my basement then I would excrement with a few different one but it does not look as I have this opportunity. For a time being I decided to stay with default phases plug and play with filters. If a first order will not be strong enough I can always got for 1.5 order and see how it behaves, or for second order. It all will be obvious when I put both of the Vitavox S2 channels together and will look if the vertical image is moving up with frequency. If it stays, or moved at negligible distance (that I think it will be doing) then it will be sufficient enough roll of.

Rgs, Romy the Cat

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