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.
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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.
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?
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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
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/whitepapers/2004_01_1694.pdf
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/whitepapers/2004_01_1694.pdf
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