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Post by jackvader on Aug 6, 2010 17:12:28 GMT -5
hi new to this forum and looking to add power to my HT, I could not find this info from the XPA-5 specs so would like to ask if anyone have information of the measured data below for XPA-5:
Nominal Power <0.1% THD+N, 8Ω, 20Hz-20kHz 5 channels driven FTC = ??Watts
thanks
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Post by thepcguy on Aug 6, 2010 18:34:38 GMT -5
FTC?..... www.n4lcd.com/RMS.pdfThis is from the UPA-5 page: (note that you are only gaining around +3db if you upgrade from UPA-5 to XPA-5)
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Post by jackvader on Aug 6, 2010 19:15:58 GMT -5
FTC?..... www.n4lcd.com/RMS.pdfThis is from the UPA-5 page: (note that you are only gaining around +3db if you upgrade from UPA-5 to XPA-5) hi pcguy, thanks, I know UPA-5 rated 125w of continuous power but measured at what bandwidth?. is it in full spectrum of 20hz ~ 20khz?
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Post by thepcguy on Aug 6, 2010 19:57:12 GMT -5
FTC?..... www.n4lcd.com/RMS.pdfThis is from the UPA-5 page: (note that you are only gaining around +3db if you upgrade from UPA-5 to XPA-5) hi pcguy, thanks, I know UPA-5 rated 125w of continuous power but measured at what bandwidth?. is it in full spectrum of 20hz ~ 20khz? Ask EMOTIVA.
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Post by johndavidson on Aug 6, 2010 20:11:33 GMT -5
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Post by johndavidson on Aug 6, 2010 20:19:10 GMT -5
FTC?..... www.n4lcd.com/RMS.pdfThis is from the UPA-5 page: (note that you are only gaining around +3db if you upgrade from UPA-5 to XPA-5) I am not sure what this guys point is. It is RMS power as voltage on its own does not result in power since RMS refers to the heating effect of the DC equivalent and heat is power it is RMS power!
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Post by thepcguy on Aug 6, 2010 20:25:02 GMT -5
FTC?..... www.n4lcd.com/RMS.pdfThis is from the UPA-5 page: (note that you are only gaining around +3db if you upgrade from UPA-5 to XPA-5) I am not sure what this guys point is. It is RMS power as voltage on its own does not result in power since RMS refers to the heating effect of the DC equivalent and heat is power it is RMS power! I guess the Guy's point is about FTC? Quoted from the link:
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Post by johndavidson on Aug 6, 2010 20:41:25 GMT -5
I am not sure what this guys point is. It is RMS power as voltage on its own does not result in power since RMS refers to the heating effect of the DC equivalent and heat is power it is RMS power! I guess the Guy's point is about FTC? Quoted from the link: Yeah it is kind of word play but it was to prevent manufacturers from using peak voltage to calculate power. when the FTC started the RMS ratings it was to imply that the calculations was done with RMS voltage as it should be. As an example if you where to used the peak voltage on the UPA-5 you would end up with a power rating about twice as high.
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Post by jackvader on Aug 6, 2010 20:42:24 GMT -5
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Post by johndavidson on Aug 6, 2010 20:48:22 GMT -5
Does make you think what those XPR amps will really able to do unless you pull in a 40 amp dedicated circuit!
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DYohn
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Post by DYohn on Aug 6, 2010 20:52:25 GMT -5
FTC? How about CEA-490-A?
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Lonnie
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Post by Lonnie on Aug 6, 2010 21:06:55 GMT -5
We use the Adio Precision to run all power test which meet all the requirements of the FTC spec. All power specs are rated across the entire frequency band, at the specified THD level, with all channels driven. So the pwer we state is the FTC rating.
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Lonnie
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Post by Lonnie on Aug 6, 2010 21:15:35 GMT -5
Test it for yourself or come on by and we will happily put it on the bench and show it meets or exceeds all rated specs. Full power with all channels driven across the entire frequency spectrum.
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Post by Nemesis.ie on Aug 7, 2010 6:21:11 GMT -5
Lonnie: Is this continuously? How long is the test run for?
Thanks!
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Post by johndavidson on Aug 7, 2010 8:08:15 GMT -5
Lonnie: Is this continuously? How long is the test run for? Thanks! My question would be do you ever test at full power for 4 hours continuous on normal household circuits (15 and 20 amp circuit)?
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Lonnie
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Post by Lonnie on Aug 7, 2010 9:32:17 GMT -5
Lonnie: Is this continuously? How long is the test run for? Thanks! My question would be do you ever test at full power for 4 hours continuous on normal household circuits (15 and 20 amp circuit)? In short, no. Why would you run an amp at full power on all channels for 4 hours? What would this prove? What useful information could be derived from this when it is never used in this way? Music by nature is dynamic and not continuous so a 4 hour full power test would not result any useful data so what would be the point?
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Lonnie
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Post by Lonnie on Aug 7, 2010 9:34:03 GMT -5
Lonnie: Is this continuously? How long is the test run for? Thanks! I don't know. How long does it take for an AP to extrapolate the data? AP does not release this kind of detailed information, so you would have to ask them.
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LCSeminole
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Post by LCSeminole on Aug 7, 2010 9:43:22 GMT -5
My question would be do you ever test at full power for 4 hours continuous on normal household circuits (15 and 20 amp circuit)? In short, no. Why would you run an amp at full power on all channels for 4 hours? What would this prove? What useful information could be derived from this when it is never used in this way? Music by nature is dynamic and not continuous so a 4 hour full power test would not result any useful data so what would be the point? I can only imagine what 4 straight hours of any type of sound at 200 watts rms would do to the hearing. I bet hearing aid companies such as Beltone, Starkey Labs, Phonak and Siemens would be very helpful in the aiding and testing of this type of bench testing. ;D
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DYohn
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Post by DYohn on Aug 7, 2010 9:45:00 GMT -5
No offense to anyone here but it seems to me that some of these questions are coming from the same place that a lot of non-engineer's questions about specs come from: a basic lack of understanding of how audio equipment is tested, and what the specs actually mean.
FYI the APX-515 can get full specs on an amplifier in under a minute when controlled through Lab View.
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Post by RightinLA on Aug 7, 2010 9:47:58 GMT -5
FTC?..... www.n4lcd.com/RMS.pdfThis is from the UPA-5 page: (note that you are only gaining around +3db if you upgrade from UPA-5 to XPA-5) There is more to power amp specs than just RMS or continuous power output. The XPA series does a better job with low impedance speakers.
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