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Post by mirekti on Jan 23, 2015 15:22:42 GMT -5
Hi all,
it seems I wasn't able to find this information on the Emotiva's website.
I plan on buying a 4 Ohm speakers with the sensitivity rated to 87dB. As 4 Ohms take more power, can someone clarify me how this will impact the Class A part of the amplifier, please?
How much Class A Watt power will I have with 4 Ohm speakers?
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Post by brubacca on Jan 23, 2015 16:12:34 GMT -5
You will get 35W of class A power into 4 ohm or 8ohm speakers.
That should get you up to about 96dB if you sit about 10ft away.
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Post by mirekti on Jan 23, 2015 18:10:02 GMT -5
You will get 35W of class A power into 4 ohm or 8ohm speakers. That should get you up to about 96dB if you sit about 10ft away. Thanks, I assume this should be more than loud enough. For example, what is the level of dB when you listen to the music? My room is 12' by 18'. |
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Post by Gary Cook on Jan 23, 2015 18:16:06 GMT -5
I vary rarely get over 80 db. except party time of course.
Cheers
Gary
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Post by geebo on Jan 23, 2015 18:36:09 GMT -5
You will get 35W of class A power into 4 ohm or 8ohm speakers. That should get you up to about 96dB if you sit about 10ft away. Thanks, I assume this should be more than loud enough. For example, what is the level of dB when you listen to the music? My room is 12' by 18'. With the 1L if you do go over 35 watts you won't even know it because it will transition to AB mode seemlessly. And that will most likely only be on peaks and very briefly at that. |
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Post by Boomzilla on Jan 23, 2015 19:52:37 GMT -5
I run 4-ohm speakers with my XPA-1L in Class A mode & it works fine (sounds AMAZING)!
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Post by brubacca on Jan 23, 2015 19:53:27 GMT -5
My peaks don't reach 90dB. In fact at my loudest listening my peaks only get to about 86dB.
An 87dB efficient speaker produces 87dB @ 1 Watt @ 1 Meter from the speaker.
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Post by mirekti on Jan 28, 2015 19:38:57 GMT -5
Thanks, I assume this should be more than loud enough. For example, what is the level of dB when you listen to the music? My room is 12' by 18'. With the 1L if you do go over 35 watts you won't even know it because it will transition to AB mode seemlessly. And that will most likely only be on peaks and very briefly at that. What about if you listen at a level that is close to 35W and every time a drum has to strike the amp switches to AB, and than back to A. Is this harmful towards the amp given there will be many switchovers? Is there a thread where I could read more about the way amp switches from A to A/B and back? |
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Post by Gary Cook on Jan 28, 2015 19:51:45 GMT -5
There's no actual "switching" involved in the transition from Class A to Class AB it's a simple change in the bias. The bias change is imperceptible, we can't hear it. It's normal operation for a Class AB amps as they all run at some level of Class A bias until they transition. For example XPA-1 Gen 1's run up to 10 watts of Class A before the bias changes to Class AB operation. The XPA-1L's do it at 35 watts and the XPA-1 Gen 2's at 60 watts.
Cheers
Gary
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Post by geebo on Jan 28, 2015 19:53:30 GMT -5
With the 1L if you do go over 35 watts you won't even know it because it will transition to AB mode seemlessly. And that will most likely only be on peaks and very briefly at that. What about if you listen at a level that is close to 35W and every time a drum has to strike the amp switches to AB, and than back to A. Is this harmful towards the amp given there will be many switchovers? Is there a thread where I could read more about the way amp switches from A to A/B and back? (looks like Gary beat me to it...) You might want to try to PM Lonnie or KeithL for more on how the transition occurs. I can tell you it is not a mechanical relay or anything that would make a noise of any kind. I've never detected a switch from one mode to the other and I've not heard anyone say they could detect it, either. I believe it may just be a change in the bias current and is handled totally in the electronics. It does no harm to switch back and forth. It does, however, run considerably warmer in A mode. |
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Post by garbulky on Jan 28, 2015 20:00:37 GMT -5
Yeah a lot of amps just a watt or less in class A before switching. So this is normal operation and not something that wears anything out.
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Post by jdaddabbo on Mar 3, 2015 13:03:58 GMT -5
This is simply not correct "You will get 35W of class A power into 4 ohm or 8ohm speakers.". You will only get HALF of the 35W into 4 ohm. Same goes for the XPA-1, 60W Class A into 8 ohms, but only 30W into 4 ohms. So where as the XPA-1's 30W Class A into 4 ohms will work for me (Speaker Sensitivity is 92db / In-room 95db),the XPA-1L's 17.5W Class A into 4 ohms simply will not cut it given my personal listening habits (for others this may differ).
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Post by geebo on Mar 3, 2015 14:11:50 GMT -5
This is simply not correct "You will get 35W of class A power into 4 ohm or 8ohm speakers.". You will only get HALF of the 35W into 4 ohm. Same goes for the XPA-1, 60W Class A into 8 ohms, but only 30W into 4 ohms. So where as the XPA-1's 30W Class A into 4 ohms will work for me (Speaker Sensitivity is 92db / In-room 95db),the XPA-1L's 17.5W Class A into 4 ohms simply will not cut it given my personal listening habits (for others this may differ). According to Emo, it's 35 into 4 or 8 ohms. emotivalounge.proboards.com/post/641875 |
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Post by garbulky on Mar 3, 2015 14:38:41 GMT -5
My listening volume is in the 60's at listening position. And peaking in the high 70's...maybe 80 most.
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Post by jdaddabbo on Mar 3, 2015 14:51:38 GMT -5
Again, very sorry for whomever from Emotiva might have communicated this to you and others, but that is simply incorrect. Not that any of us want to spend the $ figure of an XPA-1, but having run some Power Tests using a high-quality very low powered (wattage) amplifier, I quickly realized that the XPA-1L simply wouldn't cut it for my personal listening habits given my particular speakers and room. The good news is, is that it delayed my amplifier upgrade purchase just a bit, but I am now extremely HAPPY with my purchase of 2 (actually 3 / matching center channel amp) XPA-1 amplifiers..., running them in Class A for Music and a flip of the switch into A/B for all Movie watching.
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Post by geebo on Mar 3, 2015 14:58:14 GMT -5
Again, very sorry for whomever from Emotiva might have communicated this to you and others, but that is simply incorrect. Not that any of us want to spend the $ figure of an XPA-1, but having run some Power Tests using a high-quality very low powered (wattage) amplifier, I quickly realized that the XPA-1L simply wouldn't cut it for my personal listening habits given my particular speakers and room. The good news is, is that it delayed my amplifier upgrade purchase just a bit, but I am now extremely HAPPY with my purchase of 2 (actually 3 / matching center channel amp) XPA-1 amplifiers..., running them in Class A for Music and a flip of the switch into A/B for all Movie watching. What is incorrect? 35 watts into either 4 or 8 ohms? |
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Post by jdaddabbo on Mar 3, 2015 15:14:31 GMT -5
Yes, that is incorrect. The XPA-1L only has 17.5W (approx) in Class A into 4 ohms. The 35W figure is the XPA-1L Class A into 8 ohms (see my previous comments).
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Post by geebo on Mar 3, 2015 15:23:03 GMT -5
Yes, that is incorrect. The XPA-1L only has 17.5W (approx) in Class A into 4 ohms. The 35W figure is the XPA-1L Class A into 8 ohms (see my previous comments). Would you mind letting us in on how you know this to be the case when Keith and I believe Lonnie also has said 35 watts into 4 or 8 ohms. Are they not familiar with their product's design parameters? |
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Post by monkumonku on Mar 3, 2015 15:26:24 GMT -5
Yes, that is incorrect. The XPA-1L only has 17.5W (approx) in Class A into 4 ohms. The 35W figure is the XPA-1L Class A into 8 ohms (see my previous comments). Supporting documentation, please. |
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Post by hcsunshine90 on Mar 3, 2015 15:37:07 GMT -5
since the XPA-1L puts out (in class A/B) 250 watts into 8 ohms and 500 watts into 4 ohms...wouldn't it be the opposite of what jdaddabbo says, wouldn't the XPA-1L in class A mode put out 35 watts into 8 ohms and 70 watts into 4 ohms?
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