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In the Forum: Horn-Loaded Speakers
In the Thread: An ultimate horn profile?
Post Subject: Center your drivers, boys.Posted by Romy the Cat on: 4/15/2005

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 cv wrote:
This is but one reason why I'm asking Martin Seddon to make me a pair of 160Hz horns...
Another problem….

Chris, be carefully with those large 160Hz horn and S2. The guys who make then have no instruments to center the mounting holes very precisely (wood-turning machines apparently do not furnish this level of precision, not to mention the concrete pouring machines :-) As the result, if you have a compression driver with own channel, and the driver is not exactly centered within your external horn (a fraction of millimeter does mater) then you would have a slight suck-off at middle. For instance my horn has a centering mechanism   (courtesy to John Hasquin) that allows centering the driver. I use a high resolution RTA (0.25db at 1/12 octave) running a sweep and moving the driver. Wherever I get a perfectly flat response at 4kH there I would consider the drive in the centered. Moving the driver within 2-3mm introduce an octave wide drop between 3kH and 5kH with minus 2-3 db at 4kH. Some of the drivers are less sensitive and particularly the drivers where the throats at the end of the phase plug but if you driver has own inner-horn than the centering it within the outer-horn become very important.

Rgs,
The caT

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