SEAS 27TBFC curiosity

PeteMcK · 18th November 2007, 05:31 AM

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).

owdi · 18th November 2007, 06:28 AM

Mine also have the clear plastic disc below the grid. I believe it helps improve top end off axis response.

Dan

Jon Paulsen · 18th November 2007, 03:34 PM

Hi,

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

Dave Bullet · 18th November 2007, 08:47 PM

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.

sreten · 19th November 2007, 10:45 AM

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.

Jon Paulsen · 19th November 2007, 02:23 PM

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
SEAS

18th November 2007, 05:31 AM	#1
PeteMcK diyAudio Member Join Date: Feb 2002 Location: Sydney	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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18th November 2007, 06:28 AM	#2
owdi diyAudio Member Join Date: Sep 2003 Location: Bellevue, WA	Mine also have the clear plastic disc below the grid. I believe it helps improve top end off axis response. Dan

18th November 2007, 03:34 PM	#3
Jon Paulsen diyAudio Member Join Date: Nov 2007	Hi, The plastic lense or diffusor is there to lift the frequency response between 15 and 20kHz

18th November 2007, 08:47 PM	#4
Dave Bullet diyAudio Member Join Date: Jan 2002 Location: Wellington, New Zealand	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.

19th November 2007, 02:23 PM	#6
Jon Paulsen diyAudio Member Join Date: Nov 2007	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 SEAS

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