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Post by dcibel on Nov 13, 2010 13:38:20 GMT -5
Hello all,
I have always wondered, when comparing UPA-5 to XPA-5...
UPA-5: 600VA transformer, 90,000uF power supply storage capacitance
XPA-5: 1200VA transformer, 60,000uF power supply storage capacitance
Why would the bigger better XPA have less power supply smoothing? Answer: It doesn't. I cracked open my UPA-5 only to find six 10,000uF caps. BOTH amps have 60,000uF.
Do with that information as you will. These products have been around for some time without Emotiva correcting the web-page.
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Post by johndavidson on Nov 13, 2010 13:45:52 GMT -5
Let me grab the popcorn before it gets started!  |
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Post by jackfish on Nov 13, 2010 13:56:46 GMT -5
What do you say to the XPA-2 having 45,000uF of effective secondary capacitance with 180,000uF of actual capacitors ? The twelve 15,000uF capacitors are wired in a series-parallel configuration.
Some of these discrepancies may be misprint, others due to a particular wiring configuration, but I'm not sure Emotiva is intentionally trying to be misleading.
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Post by dcibel on Nov 13, 2010 13:57:25 GMT -5
Just want everyone to know the spec page is wrong. By drawing attention to the error, hopefully it will be corrected. Not trying to start a fight.
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Post by dcibel on Nov 13, 2010 14:01:45 GMT -5
What do you say to the XPA-2 having 45,000uF of effective secondary capacitance with 180,000uF of actual capacitors ? The twelve 15,000uF capacitors are wired in a series-parallel configuration. I say if the effective capacitance is 45,000uF, then the spec is correct. |
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Lonnie
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Post by Lonnie on Nov 13, 2010 14:16:53 GMT -5
I'm not sure what the deal is, but no intentional deception. We have always been very open and honest about our specs. I'm not in the office today but I will absolutely follow up on this Monday and get to the bottom of it. |
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Post by eljaycanuck on Nov 13, 2010 14:30:19 GMT -5
Thanks to dcibel for pointing out an apparent inconsistency; thanks to Lonnie for the quick reply w/ promise to address the issue. I'll withhold my judgement until next week...  |
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Post by johndavidson on Nov 13, 2010 14:56:52 GMT -5
Well since we are in intermission until Monday I went down stairs and checked mine. The power supply supply has 6, 10000uf, 63 volt, 105 degree C caps. My amp is about 9 months old
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Post by tchaik on Nov 13, 2010 15:40:25 GMT -5
i don't really think anybody assumes that the upa-5 would have greater capacitance than the xpa-5 considering its overall lower power and weight. i have seen more than my share of typos in their postings and am not surprised by this one. usually when someone points it out to the powers to be they eventually make the changes on their website. i assume this one will be corrected soon. tchaik........... some may assume i assume too much. don't make rash assumptions. |
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stiehl11
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Post by stiehl11 on Nov 13, 2010 16:51:37 GMT -5
Just want everyone to know the spec page is wrong. By drawing attention to the error, hopefully it will be corrected. Not trying to start a fight. There is drawing attention to the concern and then there's going off the hook. A lie is usually done with malicious intent, a mistake is unintentional. Calling someone a liar is usually considered fighting words. If your intent is not to start a fight may I recommend that you change the wording of your topic to match your second post. Lonnie is all over it and will post his results on Monday. |
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Pauly
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Post by Pauly on Nov 13, 2010 16:54:50 GMT -5
Wow, it's like the Polk forum in here lol.
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Post by johndavidson on Nov 13, 2010 17:07:31 GMT -5
i don't really think anybody assumes that the upa-5 would have greater capacitance than the xpa-5 considering its overall lower power and weight. i have seen more than my share of typos in their postings and am not surprised by this one. usually when someone points it out to the powers to be they eventually make the changes on their website. i assume this one will be corrected soon. tchaik........... some may assume i assume too much. don't make rash assumptions. So can we assume any of their specification are correct? Lonnie has commented many times this amp is able to produce its power spec due to the large capacitance in the power supply even with the relative small transformer. What can we now assume about that?  Don't get me wrong, I know every company makes mistakes but as many times that I have heard that Emotiva designs their stuff themselves from the ground up I would think that they would have a better handle on these type of errors. If I had already been called out about not correctly stating the capacitance in one of my amps (the XPA2) the first thing I would have done after correcting that mistake is made sure all the rest was correct. It will be very intersting to hear Lonnie's response on the issue. Modified! I got to watch my spelling ;D |
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LCSeminole
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Post by LCSeminole on Nov 13, 2010 17:34:21 GMT -5
Wow, it's like the Polk forum in here lol. I assure all members that this thread won't go in that direction. Please take care to follow the Lounge rules. Lonnie has said he'll follow up on this and report back. Please keep this thread civil.  |
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Post by woodfiend on Nov 13, 2010 18:05:37 GMT -5
Oh brother......whatever happened to decorum? There is a proper way to address such issues. Lobbing verbal molotov cocktails may get you banned and I have no problem with that...... However I don't think you would get banned for asking a question or having a negative tone. One such way might be to start a thread with the title "I noticed a discrepancy and need clarification" Or "How come these specs don't seem to jive?" And I am sure you would get better responses.
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ntrain42
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Post by ntrain42 on Nov 13, 2010 18:49:16 GMT -5
This sounds like a thread for SUPER NTRAIN!
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Post by Mischief on Nov 13, 2010 18:51:11 GMT -5
Like most super heroes, Super Ntrain will leave the city in ruins but surely vanquish the foe.
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Post by ledd4u on Nov 13, 2010 18:53:11 GMT -5
Well If I designed an amp, I surely would be able to give you an answer as quick as Five time constants, no pun intended :-)
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ntrain42
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Post by ntrain42 on Nov 13, 2010 18:55:02 GMT -5
Like most super heroes, Super Ntrain will leave the city in ruins but surely vanquish the foe. Thats an understatement. |
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iceman66
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Post by iceman66 on Nov 13, 2010 18:57:53 GMT -5
This sounds like a thread for SUPER NTRAIN! A battle of wits against an unarmed foe? surely a waste your great powers. |
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ntrain42
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Post by ntrain42 on Nov 13, 2010 19:01:24 GMT -5
Hello all, I have always wondered, when comparing UPA-5 to XPA-5... UPA-5: 600VA transformer, 90,000uF power supply storage capacitance XPA-5: 1200VA transformer, 60,000uF power supply storage capacitance Why would the bigger better XPA have less power supply smoothing? Answer: It doesn't. I cracked open my UPA-5 only to find six 10,000uF caps. BOTH amps have 60,000uF. Do with that information as you will. These products have been around for some time without Emotiva correcting the web-page. Well if both the XPA-5 and UPA-5 have 60,000 in secondary capacity, then the UPA-5 technically still has more reserve capacity since its a less powerful amp overall. And regardless of the fact, that would only be one minor mistake in the public spec page. How would that equate to multiple "lies"?  Lies ='s a plural concept. |
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Lies ='s a plural concept.