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Post by metaldaze on Sept 19, 2017 12:08:55 GMT -5
I've read in older threads, previously there wasn't a power rating for Emotiva's amps into 2 ohms. The XPA Gen 3 amps show a huge 800 watts into 2 Ohms with still relatively minimal distortion. I have the four channel version & 2 of my channels are wired to speakers in parallel. For these two channels, their nominal impedance in this configuration comes out to be between 2.5 & 4 Ohms. A little number crunching leads me to believe with all 4 channels running hard, @ 4 Ohms each channel is probably maxing around 400 watts. What about below this impedance? Can anyone confirm or constructively criticize these figures? I'm just wondering for my own knowledge. Thanks!
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Post by garbulky on Sept 19, 2017 12:26:04 GMT -5
I've read in older threads, previously there wasn't a power rating for Emotiva's amps into 2 ohms. The XPA Gen 3 amps show a huge 800 watts into 2 Ohms with still relatively minimal distortion. I have the four channel version & 2 of my channels are wired to speakers in parallel. For these two channels, their nominal impedance in this configuration comes out to be between 2.5 & 4 Ohms. A little number crunching leads me to believe with all 4 channels running hard, @ 4 Ohms each channel is probably maxing around 400 watts. What about below this impedance? Can anyone confirm or constructively criticize these figures? I'm just wondering for my own knowledge. Thanks! Though Emotiva amps can handle 2 ohm loads. It's minimum reccomended load is 4 ohms according to its own specs. Running it below 2 ohms (which is very possible with a nominal impedance of 2.5 ohms) is not reccomended. It may work out fine for you, but it's not ideal is what I'm saying. The 800 watt figure is for one channel driven. Multiple channels driven will drop it. There is a protection circuit that kicks in when the impedance drops - I think below 1 ohm or 0.5 ohms. The power supply on the XPA gen 3 is I believe a 2 kilowatt unit. |
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Post by metaldaze on Sept 19, 2017 12:52:49 GMT -5
Noted. Keeping the synergy in the system is my main goal. I've yet to ever trip the protection circuit thankfully. However I've still been wondering if a second amp will make my system happier.
Their website states a 3Kw power supply, but still stressing the amp is just that. I was going to call Emotiva directly but figured I'd try some feedback here first. I don't exactly have the money to drop on another amplifier right now as much as I'd like to.
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Post by metaldaze on Sept 19, 2017 13:19:27 GMT -5
"Mar 6, 2012 10:39:19 GMT -4 Lonnie said: All of the XPA amplifiers will work just fine with your speakers. We don't officially state that the amplifiers are 2 ohm stable because history has shown that people will then want to run them into 1 ohm loads. But a 4 ohm dynamic load that dips below 2 ohms is certainly not an issue. ;D" Ah. Just found this in a thread from a while ago. Directly from Lonnie. I'm taking it that even though this post is around 5 years old, it still holds true, if not more so now. I did as much research as I could before making my purchase. Seems I forgot how thorough I was because I know I've read this before  |
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Post by garbulky on Sept 19, 2017 14:06:27 GMT -5
"Mar 6, 2012 10:39:19 GMT -4 Lonnie said: All of the XPA amplifiers will work just fine with your speakers. We don't officially state that the amplifiers are 2 ohm stable because history has shown that people will then want to run them into 1 ohm loads. But a 4 ohm dynamic load that dips below 2 ohms is certainly not an issue. ;D" Ah. Just found this in a thread from a while ago. Directly from Lonnie. I'm taking it that even though this post is around 5 years old, it still holds true, if not more so now. I did as much research as I could before making my purchase. Seems I forgot how thorough I was because I know I've read this before I think it's 2kw because it's still a 15 a circuit it connects so the limitations of the line itself would likely make 3 kw useless. But I maybe wrong. The 2012 statement was for the XPA amplifiers which were not gen 3. The gen 3 uses a switching mode power supply - albeit a very powerful one. The previous gen units use large torroidal power supplies which may cause a difference. But I guess as he said if it's not 1 ohm then you'll likely be fine. |
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Post by metaldaze on Sept 19, 2017 15:35:32 GMT -5
Yeah I'm not super clear on the actual line draw of the new Gen amps. I read the audioholics review of the XPR amps that actually sagged the reviewers line in voltage. Again those were using the massive toroidal transformers. I do realize the difference between those and the SMPS the gen 3 uses. I was cautiously optimistic but the price, specs, and reviews had me placing an order.
I suppose you may have a point though about the 15 amp internal circuit being the limiting factor. 15amp X 120V = 1800watts
Perhaps they mean line draw coupled with the internal reserves from the caps? Nevertheless
As far as I'm able to push the volume without getting in trouble, it seems to run my set up good so cheers to that. Just want it to stay that way!
Also thank you for your replies.
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Post by leonski on Sept 19, 2017 16:31:12 GMT -5
"Mar 6, 2012 10:39:19 GMT -4 Lonnie said: All of the XPA amplifiers will work just fine with your speakers. We don't officially state that the amplifiers are 2 ohm stable because history has shown that people will then want to run them into 1 ohm loads. But a 4 ohm dynamic load that dips below 2 ohms is certainly not an issue. ;D" Ah. Just found this in a thread from a while ago. Directly from Lonnie. I'm taking it that even though this post is around 5 years old, it still holds true, if not more so now. I did as much research as I could before making my purchase. Seems I forgot how thorough I was because I know I've read this before I think it's 2kw because it's still a 15 a circuit it connects so the limitations of the line itself would likely make 3 kw useless. But I maybe wrong. The 2012 statement was for the XPA amplifiers which were not gen 3. The gen 3 uses a switching mode power supply - albeit a very powerful one. The previous gen units use large torroidal power supplies which may cause a difference. But I guess as he said if it's not 1 ohm then you'll likely be fine. Right you are, Gar. 15amp line is 1800 watts or 1440 continuous, due to 20% derate. Having a mondo-amp on a 15 amp circuit is nutty and contra-productive. The MAIN benefit of the SMPS in the G3 gear is Shipping Weight. And heavy, sort-of delicate stuff gets damaged a LOT more in shipping than the same thing which otherwise simply weighs a lot less. When I brought up the fact that some of the largest EMO mono blocks REQuire a 20 amp service, all I got back was, 'But it's a KiloWatt Amp!' with nobody willing to realize that you've got a 450hp engine THAN pulled a couple spark plug wires. For Meta? I'll bet the G3 will ALSO sag the power line. Amp uses a conventional A/B output section which is limited to maybe 50%->55 efficiency. Adding a couple points of efficiency due to PS? Not going to make the Huge Difference. My Carver Cube of 200x2 would make the lights in the house flicker in time to the music. Almost ALL tests of higher powered amps will use a VARIAC on the power line. |
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