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Post by nupdyxa on Dec 22, 2013 8:30:47 GMT -5
I recently received a couple of XPA-100 amps. When purchasing those I paid attention to the spec'ed power, which according to the emotiva page are:
250 watts into 8 Ohm (THD < 1%)
400 watts into 4 Ohm (THD < 1%)
Surprisingly, when I got the product and opened the included manuals, they indicate:
225 watts into 8 Ohm (no THD mentioned)
360 watts into 4 Ohm (no THD mentioned)
So, why is the specs on the web page are different from the manual? Did I get an older version/revision of the amps?
Obviously, more power would be preferred, though, the amps seem pretty capable, as the resistors in LSi15 Polks got fried shortly after I cranked the amps up :-(.
Thanks for any info on the power of XPA-100...
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Post by jmasterj on Dec 22, 2013 11:52:40 GMT -5
nupdyxa,
Hi and welcome to the forum. I just got my XPA-100's and asked the same question. Nobody from Emotiva responded. It seems like a reasonable question, something that could be easily answered but "they" acted like they didn't notice. Where's the technical guru when you need one?
We'll just have to wait and see if they side step this question again.
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Post by wiskers on Dec 22, 2013 14:44:49 GMT -5
It's 250 into 8, 400 into 4, 32 gain, Look at the test report pdf.
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Post by danny01 on Dec 22, 2013 15:23:57 GMT -5
I think the specs in the manual make more sense considering the 360VA transformer. Of course that is if you are outputting a continuous sine wave. There was talk about the specs of the XPA-100 not being as good as it's predecessor, the UPA-1. That amp had a 300VA transformer, but 80,000mf of capacitance. After those comments, Emotiva raised the stated output power
On their website for the XPA-100 while also raising THD to 1%. So I believe the power ratings in the manual are @ .01%THD and the spec on the website are at the onset of clipping. Sure the XPA-100 will be capable of outputting the claimed power on the website, but not continously. But that isn't something you need to worry about as peaks are never continous with real world material.
Sent from my HTC6500LVW using proboards
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Post by nupdyxa on Dec 22, 2013 18:25:41 GMT -5
I think the specs in the manual make more sense considering the 360VA transformer. Of course that is if you are outputting a continuous sine wave. There was talk about the specs of the XPA-100 not being as good as it's predecessor, the UPA-1. That amp had a 300VA transformer, but 80,000mf of capacitance. After those comments, Emotiva raised the stated output power On their website for the XPA-100 while also raising THD to 1%. So I believe the power ratings in the manual are @ .01%THD and the spec on the website are at the onset of clipping. Sure the XPA-100 will be capable of outputting the claimed power on the website, but not continously. But that isn't something you need to worry about as peaks are never continous with real world material. Sent from my HTC6500LVW using proboards Thanks for your reply Danny01, Just checked the online pdf sheets with Power vs THD charts. The charts are quite coarse, but some approximation can still be made. Anyway, to my eyes, the rated power in the manual (225W into 8Ohm and 360W into 4Ohm) roughly corresponds to THD in the range of 0.2-0.3% |
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