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SEAS 27TBFC curiosity
SEAS 27TBFC curiosity
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Old 18th November 2007, 05:31 AM   #1
PeteMcK is offline PeteMcK
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Default SEAS 27TBFC curiosity

While attempting to clean what I thought was speck of dust from the grill of one of my 27TBFCs, it appears that there is a clear plastic disk covering the centre of the grid (on the inside)...???

I know my eyesight is on the way out, but I don't think it's that bad, can anyone confirm that theirs are the same?

I suppose this will make a difference to the dispersion if anyone removes the grid... (I'm still very happy with these drivers, not complaining).
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Old 18th November 2007, 06:28 AM   #2
owdi is offline owdi  United States
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Mine also have the clear plastic disc below the grid. I believe it helps improve top end off axis response.

Dan
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Old 18th November 2007, 03:34 PM   #3
Jon Paulsen is offline Jon Paulsen  Norway
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Hi,

The plastic lense or diffusor is there to lift the frequency response between 15 and 20kHz
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Old 18th November 2007, 08:47 PM   #4
Dave Bullet is offline Dave Bullet  New Zealand
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I see the same on mine. Although I haven't taken the grille off, when angled under sunlight, looks like the dome itself has a "flat spot" in the centre - which is a hexagonal shape.

Good to have that explanation.

Thanks,
David.
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Old 19th November 2007, 10:45 AM   #5
sreten is offline sreten  United Kingdom
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Quote:
Originally posted by Jon Paulsen
Hi,

The plastic lense or diffusor is there to lift the frequency response between 15 and 20kHz

Hi,

Not really. It improves the dispersion characteristics, which are very good.

/sreten.
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Old 19th November 2007, 02:23 PM   #6
Jon Paulsen is offline Jon Paulsen  Norway
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Hi Sreten

That is a consequence. I was involved in the development of the disc at that time and did most of the measurements.

Jon
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