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Old 19th June 2007, 06:16 PM   #1
jamesdb is offline jamesdb  United States
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Join Date: Jun 2007
Default DIY phase plug, snug fit or not?

When making a DIY Phase plug, should the plug fit very snugly against the hole, or should there be a tiny gap/free space between the sides of the plug and the hole of the paper cone? Thanks
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Old 20th June 2007, 03:07 PM   #2
MarkMcK is offline MarkMcK  United States
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The inside of the voice coil former should not rub against the sides of the plug. The tolerances for VC former ID and plug OD do not have to be extremely tight. At some point, however, the gap will contain enough air to resonate at audible frequencies. So, the voice coil must be able to move freely. A small gap between the VC former ID and the plug OD is fine. A large gap, however, is not fine.

I usual chose a ratio of VC former ID and plug OD that allows free motion of the VC to the mechanical excursion limit of the transducer. Keep in mind that as you approach the excursion extremes you will get some drift in alignment.

As a rule of thumb, if you use the pole piece OD for your plug OD you will be fine on all counts.


Best on your quest for better sound,

Mark
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Old 20th June 2007, 08:34 PM   #3
jamesdb is offline jamesdb  United States
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Default thanks! nt

much appreciated
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