"standard" testing baffle

parrot · 28th December 2006, 10:30 PM

I own a speaker kit based on PHL 2440 drivers in MTM with Ravens R2. PHL are somewhat coy about response curves and I don't have the equipment to do my own testing. I've managed to source some curves taken using an "IEC60268-5 standard flat baffle" and I'm wondering if anyone here can give me some idea as to the dimensions of this test baffle.

p

Ron E · 28th December 2006, 11:54 PM

IEC standard baffle: 135 cm wide, 165 cm high with driver center offset 15 cm to one side and 22.5 cm towards the top from the baffle center.

parrot · 29th December 2006, 12:24 AM

thanks Ron,

that's BIG and in this case [and probably most others], very different from the speaker box the drivers will finally come to rest in.

The offsets are presumably designed to smooth baffle step but may I ask ... is this particular standard designed to show up certain features of a driver for further analysis/correction or is it just a convention?

p

Ron E · 29th December 2006, 12:44 AM

Not sure of the origin of the standard, but it gives about +/- 1dB compared to infinite baffle above ~500Hz and +/- 2 down to 100Hz.

I would guess that it is somewhat arbitrary, but chosen for the qualities above and practical reasons like moving it and setting it up, etc and mainly as a standard point of comparison.

See:
http://www.visteon.com/utils/whitepa...04_01_1694.pdf

parrot · 29th December 2006, 12:56 AM

thanks for the info. and the pdf. reference. That's helpful

p

28th December 2006, 10:30 PM	#1
parrot diyAudio Member Join Date: Aug 2004 Location: NSW	"standard" testing baffle I own a speaker kit based on PHL 2440 drivers in MTM with Ravens R2. PHL are somewhat coy about response curves and I don't have the equipment to do my own testing. I've managed to source some curves taken using an "IEC60268-5 standard flat baffle" and I'm wondering if anyone here can give me some idea as to the dimensions of this test baffle. p

28th December 2006, 11:54 PM	#2
Ron E diyAudio Member Join Date: Jun 2002 Location: USA, MN	IEC standard baffle: 135 cm wide, 165 cm high with driver center offset 15 cm to one side and 22.5 cm towards the top from the baffle center. __________________ Our species needs, and deserves, a citizenry with minds wide awake and a basic understanding of how the world works. --Carl Sagan Science is a way of thinking much more than it is a body of knowledge. --Carl Sagan

29th December 2006, 12:44 AM	#4
Ron E diyAudio Member Join Date: Jun 2002 Location: USA, MN	Not sure of the origin of the standard, but it gives about +/- 1dB compared to infinite baffle above ~500Hz and +/- 2 down to 100Hz. I would guess that it is somewhat arbitrary, but chosen for the qualities above and practical reasons like moving it and setting it up, etc and mainly as a standard point of comparison. See: http://www.visteon.com/utils/whitepa...04_01_1694.pdf __________________ Our species needs, and deserves, a citizenry with minds wide awake and a basic understanding of how the world works. --Carl Sagan Science is a way of thinking much more than it is a body of knowledge. --Carl Sagan

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29th December 2006, 12:24 AM	#3
parrot diyAudio Member Join Date: Aug 2004 Location: NSW	thanks Ron, that's BIG and in this case [and probably most others], very different from the speaker box the drivers will finally come to rest in. The offsets are presumably designed to smooth baffle step but may I ask ... is this particular standard designed to show up certain features of a driver for further analysis/correction or is it just a convention? p

29th December 2006, 12:56 AM	#5
parrot diyAudio Member Join Date: Aug 2004 Location: NSW	thanks for the info. and the pdf. reference. That's helpful p

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