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| Re: JBL SRX728S [message #28217 is a reply to message #28214] |
Thu, 02 November 2006 16:00   |
Tom Danley
Messages: 16
Registered: May 2009
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Chancellor |
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Hi Wayne If you can, try to normalize the curves so that they represent the 1 Watt 1 Meter equivalent like you did last year. Tom
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| Re: JBL SRX728S [message #28218 is a reply to message #28217] |
Thu, 02 November 2006 16:14 |
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Wayne Parham
Messages: 18676
Registered: January 2001
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Illuminati (33rd Degree) |
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All measurements taken this year were with a 2v reference. We won't post-process them or normalize them, but you can easily calculate to find offsets normalized to common values like 2.83v or 1w. We've provided a handy decibel/voltage/power conversion chart to make this easier.To tell the truth, I had hoped to gather datasets at various power levels just like last year. I also wanted distortion measurements. But I didn't perform the measurements this year and actually it was kind of nice not having to "drive". Next year, we'll be sure to get response curves at higher power levels like we did last year. We'll also get distortion measurements again. We may make it a two day event, if we need the extra time. Hope to see you there.
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| Re: JBL SRX728S [message #28351 is a reply to message #28350] |
Fri, 01 May 2009 20:05 |
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Wayne Parham
Messages: 18676
Registered: January 2001
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Illuminati (33rd Degree) |
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I don't see any mention of freespace specifically shown on the spec sheet, but I suppose you may be right. I would have expected halfspace, but the chart and other specs may reflect freespace measurements.All the data we gathered at the Prosound Shootouts were done with ground plane measurements. In 2006 we did all speakers at a constant voltage. In 2005 and 2007 we did all speakers at 28.3v, 100w, 200w, 400w and so on.
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