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Old 20th August 2006, 03:01 AM   #51
maxro is offline maxro  Canada
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Originally posted by planet10

That would though completely bypass one of the major benefits of the phase plug which is to fill the hole left after the removal of the dustcap (removal of the dustcap is usually a beneficial mod in its own right)


Not to mention increasing the driver's moving mass.
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Old 22nd August 2006, 02:48 PM   #52
Zero One is offline Zero One  Australia
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Hi Guys, I must admit I wondered about the benefit of phase plugs, as some time back I removed the centre cap of one of my 4 inch dual cone redback drivers and put in a makeshift plug. It did not seem to help, but and this is the clincher it was an unmodded driver.

After readiing these posts I decided to try again but this time with a modded driver, which consists of PVA all over the front and back of the cones, 3 layers of tissue paper around the perimeter of the cone and olive oiled surrounds and a couple of other tweaks.

Interstingly the differnce was now stunning, much cleaner treble, better imaging......just lovely.

This got me thinking, somehow I think that PVA on the centre whizzer makes it much stiffer, so the loss of the centre cap is not such a problem and hence the phase plug does the job cause the speaker is producing better highs to start with.....so this leads me to another thought that I will look at.

The reomoval of the cap still does take away some rigidity and for tight highs the centre of the whizzer cone needs to be very rigidly mated to to the former, I think that gluing a couple of layers of tissue paper around the edge where the whizzer and former join will strengthen the joint and possibly enhace the highs a little more, the weight gain would be minscule.
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