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Post by Hair Nick on Apr 20, 2020 15:36:26 GMT -5
"In this review we will explore the Tour de Force of power that is the Emotiva XPA-2. The XPA-2 is quite a powerful two-channel amp and we shall delve deep into the inner workings today." >> Read the Full Review << |
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Post by Ex_Vintage on Apr 20, 2020 22:20:01 GMT -5
The review states that the modules contain a transformer (I assume for power supply?) and that is not supported in any photos I have seen. The G3 amps use a single SMPS supply that supplies all of the modules, correct?
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Post by vcautokid on Apr 21, 2020 6:42:07 GMT -5
Correct the XPA-2 uses the very efficient SMPS for driving all of the systems in the XPA-2 gen 3.  Sorry about my screen capture. Doesn't allow a normal save on my mobile. |
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Post by leonski on May 28, 2020 19:31:39 GMT -5
Considering the power output, 35.5lb makes this amp a 'lightweight'. I rather doubt it would pass the stereophile test of 1/3 power (8ohms) for an hour. This is worst case-scenario for A/B amps......
We can argue about the 'goodness' of such a test, but bottom line is that this amp WILL or SHOULD run hot when pressed with low sensitivity speakers at higher levels.
So what that SMPS is 'efficient'? From plug to output of the speaker your system (and any other) will rarely exceed 1% Most likely LESS.
The possible exception would be the very highest sensitivity 'big box' speakers. Toss in anything class 'A' and you're a goner.
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Lsc
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Posts: 3,344
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Post by Lsc on May 29, 2020 0:10:08 GMT -5
When the reviewer doesn’t have the right facts, how can you trust the review?
I’m very happy that it was a good review but someone needs to contact him and do a fact check with him so he can correct his error.
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Post by leonski on May 29, 2020 1:16:24 GMT -5
Not that it didn't happen, but WHERE did the reviewer mess up?
High end reviews SOMETIMES have a sidebar reserved for 'manufacturers comment'........I think that is a terrific idea.
The idea being that the manufacturer can answer any poor performance or audible issues or slap the reviewer either around or on the back!
I looked at the photos of the modulele and IMO, they are insufficiently heat-sinked for the power claims.
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Lsc
Emo VIPs
Posts: 3,344
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Post by Lsc on May 29, 2020 10:41:19 GMT -5
Not that it didn't happen, but WHERE did the reviewer mess up? High end reviews SOMETIMES have a sidebar reserved for 'manufacturers comment'........I think that is a terrific idea. The idea being that the manufacturer can answer any poor performance or audible issues or slap the reviewer either around or on the back! I looked at the photos of the modulele and IMO, they are insufficiently heat-sinked for the power claims. I believe this is incorrect. “ Each amp module includes its own transformer to produce a clean signal across the frequency spectrum as opposed to sharing one for the entirety of the amp. Yet, another attention to detail that Emotiva has captured in the XPA-2.” This was pointed out several posts above. Could this be due to a slight lack of attention to detail by the reviewer?  |
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Post by leonski on May 29, 2020 12:01:55 GMT -5
AHH! I believe you are correct. ONE large PS which can service any number of modules.
I'm not much into reviews, anyway. Few 'bad' ones, and reviewers always search for the 'good side'.
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Post by AudioHTIT on May 29, 2020 21:04:15 GMT -5
Considering the power output, 35.5lb makes this amp a 'lightweight'. ... Hard to believe he considers this a “physically imposing” weight, he can’t have been doing this long or reviewed many amps. Though I consider the lighter weight of the Gen 3’s a benefit. |
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Post by leonski on May 30, 2020 12:45:25 GMT -5
I submit that I'm very old-school. An 'A' amp should weigh over 1lb per watt. Maybe more.
But even losing the big toroid, the power-to-weight of the reviewed amp puts it in the 'lightweight' end of the spectrum.
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Post by AudioHTIT on May 31, 2020 4:29:33 GMT -5
I submit that I'm very old-school. An 'A' amp should weigh over 1lb per watt. Maybe more. But even losing the big toroid, the power-to-weight of the reviewed amp puts it in the 'lightweight' end of the spectrum. Unless your talking the early Pass Class A designs (dynamic bias), the Threshold 4000 was 80 lbs for 200 WPC (the 70’s is old school isn’t it? 🙂) But I was agreeing the G3 is light, just wondering how the reviewer thought it heavy. |
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Post by leonski on May 31, 2020 20:04:12 GMT -5
Pass XA30.8 goes about 93lb. The previous version, the XA30.5 went in the 70s, somwhere.
The XS stuff from Pass is even HEAVIER. They are 2 chassis per channel, one PS, one 'Driver / output'.
If you want even the lower powered version, you'll need a fork lift or Piano movers. I doubt you'll get it UP
a flight of stairs. Or down to the basement, either, for that matter.
I have NO idea where the weight comes from but suspect outsized heat sinks and a tranformer you could use
to anchor a ship.
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