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Post by Dark Ranger on Sept 10, 2012 22:40:15 GMT -5
I also can't imagine you're going to be able to stack many (or any) of these as someone asked, if you don't let them breath you will just hasten their slide or switch back to A/B. But the mention of 'standby' was interesting, if you weren't going to use the amp but didn't want to turn it off you could put it in A/B to save power and heat - Emo could give a 'trigger' to allow external switching between modes without reaching around the back (handy with multiple amps). I agree, I definitely would not stack these amps. I plan on a dedicated shelf for each with plenty of breathing room. I'll be surprised if the mode can be controlled with anything else except a toggle switch on the rear. A front switch would be awesome, but I'm not expecting it. I've been giving the operating mode some thought and I'll probably run them in A/B most of the time. I often listen to background music while working and moving between rooms. In my mind, this doesn't warrant the extra heat/electricity. For the times I want to listen critically or just relax and do nothing but listen, I'll switch to Class A. I haven't decided on movies yet, I'll have to see how the amp sounds in each mode. I do have a small listening room that runs warm. It's on the far side of the house so the A/C doesn't cool it as well. Again, the operating mode switch is genius. I wouldn't buy it if the amp was Class A only (except in specific thermal conditions). I may be a minority on that stance. |
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Post by AudioHTIT on Sept 10, 2012 23:06:36 GMT -5
I also can't imagine you're going to be able to stack many (or any) of these as someone asked, if you don't let them breath you will just hasten their slide or switch back to A/B. But the mention of 'standby' was interesting, if you weren't going to use the amp but didn't want to turn it off you could put it in A/B to save power and heat - Emo could give a 'trigger' to allow external switching between modes without reaching around the back (handy with multiple amps). I agree, I definitely would not stack these amps. I plan on a dedicated shelf for each with plenty of breathing room. I'll be surprised if the mode can be controlled with anything else except a toggle switch on the rear. A front switch would be awesome, but I'm not expecting it. I've been giving the operating mode some thought and I'll probably run them in A/B most of the time. I often listen to background music while working and moving between rooms. In my mind, this doesn't warrant the extra heat/electricity. For the times I want to listen critically or just relax and do nothing but listen, I'll switch to Class A. I haven't decided on movies yet, I'll have to see how the amp sounds in each mode. I do have a small listening room that runs warm. It's on the far side of the house so the A/C doesn't cool it as well. Again, the operating mode switch is genius. I wouldn't buy it if the amp was Class A only (except in specific thermal conditions). I may be a minority on that stance. Makes sense, save Class A for critical listening - yes three good ideas here, high bias Class A/B, auto bias slide/switch, manual switch to standard bias. |
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Post by richardrc on Sept 10, 2012 23:49:06 GMT -5
I think an additional trigger for class A is an excellent idea either via IR or rear cable.
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Post by vitruvian on Sept 11, 2012 5:01:40 GMT -5
I posted this in another thread, but I will ask the question here as well, just in case:
Are the XPA-1Ls designed to surpass the SQ of the XPA-1s?
And, given the prototyping - do they sound better than; equal to; or not as good as the XPA-1s?
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Post by UT-Driven on Sept 11, 2012 10:56:08 GMT -5
I posted this in another thread, but I will ask the question here as well, just in case: Are the XPA-1Ls designed to surpass the SQ of the XPA-1s? And, given the prototyping - do they sound better than; equal to; or not as good as the XPA-1s? Purely theory crafting since I have not heard either one, but with a higher Class A wattage on the XPA-1L(30 watts vs. 10 watts), it seems like it would have the potential to sound better in some instances. The XPA-1s will be a better choice for really power hungry speakers or if you like to crank it all of the time (negating the Class A advantage). Doug |
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Post by dust770 on Sept 11, 2012 23:21:42 GMT -5
I posted this in another thread, but I will ask the question here as well, just in case: Are the XPA-1Ls designed to surpass the SQ of the XPA-1s? And, given the prototyping - do they sound better than; equal to; or not as good as the XPA-1s? As it was explained to me in another thread , the class A would allow for less distortion at lower volumes, but seeing as I tend to seriously crank it I was told the XPR would be better for that kind of listening. The XPA-1ls would have the advantage for say lower level 2.1 listening. |
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Post by garbulky on Sept 11, 2012 23:26:16 GMT -5
I posted this in another thread, but I will ask the question here as well, just in case: Are the XPA-1Ls designed to surpass the SQ of the XPA-1s? And, given the prototyping - do they sound better than; equal to; or not as good as the XPA-1s? As it was explained to me in another thread , the class A would allow for less distortion at lower volumes, but seeing as I tend to seriously crank it I was told the XPR would be better for that kind of listening. The XPA-1ls would have the advantage for say lower level 2.1 listening. I think I told you that. But remember that the XPA-1 is an absolute BEAST of an amp. It is in no means a lightweight. The XPR-1 will be twice as much ;D You may well be tremendously happy with the xpa-1. Depends on your pocket book  |
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Post by AudioHTIT on Sept 12, 2012 0:16:39 GMT -5
I posted this in another thread, but I will ask the question here as well, just in case: Are the XPA-1Ls designed to surpass the SQ of the XPA-1s? And, given the prototyping - do they sound better than; equal to; or not as good as the XPA-1s? As it was explained to me in another thread , the class A would allow for less distortion at lower volumes, but seeing as I tend to seriously crank it I was told the XPR would be better for that kind of listening. The XPA-1ls would have the advantage for say lower level 2.1 listening. As Doug implied you really need to include speaker efficiency when discussing how loud any given amp can play. It's probably right to say this amp is best suited for a 2 channel system, but one lounge member has 103dB efficient speakers - he could get them up over 115 dB and still be running in Class A - I think that might fit your definition of "seriously cranking it". Certainly Class A amps are designed to sound better, but they are part of a system. |
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Erwin.BE
Emo VIPs 
It's the room, stupid!
Posts: 2,269
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Post by Erwin.BE on Sept 12, 2012 4:41:23 GMT -5
As it was explained to me in another thread , the class A would allow for less distortion at lower volumes, but seeing as I tend to seriously crank it I was told the XPR would be better for that kind of listening. The XPA-1ls would have the advantage for say lower level 2.1 listening. As Doug implied you really need to include speaker efficiency when discussing how loud any given amp can play. It's probably right to say this amp is best suited for a 2 channel system, but one lounge member has 103dB efficient speakers - he could get them up over 115 dB and still be running in Class A - I think that might fit your definition of "seriously cranking it". Certainly Class A amps are designed to sound better, but they are part of a system. +1 I would not consider the XPA-1L for my Jamo's since these are 89 dB / Watt @ 1 m and swallow peaks up to 800 Watt @ 4 ohm. "Standard" XPA-1 is fine... OTOH, the DTQWT DIY designed by Troels Gravesen I am building for our HT are 95 dB and would play plenty loud in Class A up to 30 Watt. I reccon about 104 dB at normal distance. So the XPA-1L would be perfect. But there's the heat and energy for powering all those channels in a passive house build (designed even with the 80 Watts a human body provides in mind). That's why the XPR-5 with it's energy efficient Class H is better for my situation and HT setup. One could ofcourse consider a combination with XPA-1L for L/R front and XPA-100 for a "reasonable" monoblock surround configuration. |
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Post by kzone on Sept 12, 2012 11:58:46 GMT -5
hmm.. i think this will be good for my centre
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Post by Dark Ranger on Sept 12, 2012 13:00:38 GMT -5
Eventually, I'm planning to purchase one for my center as well. I need want three of these mono-blocks for the front stage, and I'll use my UPA-500 for side/back surrounds. My center channel is actually larger and more capable than my mains. The extra power and control from the XPA-1L should be a welcome improvement over the UPA-500 (which is absolutely fine for now). OK, should I rob a 7-11 or sell my body on the streets to fund these three amps?  ;D |
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Post by Dark Ranger on Sept 12, 2012 13:30:07 GMT -5
Here's a new question I have about the XPA-1L: does anyone know the gain specification for this new amp? I don't recall seeing this in the Emofest reports. I would guess 29 dB since the new amps released this year are all 29 dB (from the mini-X to the XPR-5). I e-mailed Emotiva about the gain specification on this amp (along with another unrelated question) since it appears this info wasn't provided to attendees at Emofest. My inquiry: Emotiva response: That's a big relief for me since I have a UPA-500. I prefer to match the gain on my amps for several reasons. Just wanted to share this info in case others had the same question. |
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Post by kellys on Sept 12, 2012 17:46:41 GMT -5
Gain matching isn't a requirement as long as you can control the source output levels. Audio amplification is linear.
Two channel: it's irrelevant if both amps are the same.
HT: the gain can be matched in the UMC-1, or any other surround processor with channel level trims.
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Post by zaphod2012 on Sept 12, 2012 22:53:12 GMT -5
after seeing the other thread on the XPA-1's, boy are they big buggXXX, they ARE JUST TOO big for me but the pleasure he is having makes me want to play with some XPA-1-L with my mini maggies, at 86DB efficiency, so according to watt i have read(spelling intentional)
Watts SPL
1 ---- 86 dB
2 ---- 89 dB
4 ---- 92 dB
8 ---- 95 dB
16 --- 98 dB
32 -- 101 dB
64 -- 104 dB
128 - 107 dB
256 - 110 dB
512 - 113 dB
so is the extra cost, weight and size worth an extra 3db for 100-103db of class A, i am sure they will be sweet and will be 110db before clipping, i a small room that would hertz :-)
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Post by zaphod2012 on Sept 12, 2012 23:01:57 GMT -5
now i see the mini maggies are 86db at 4ohms, so i guess that will be 104db of class A into 4ohms, unless i am interpreting these figures all wrong, am i going nuts?
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Post by SpeedD408 on Sept 13, 2012 13:27:41 GMT -5
after seeing the other thread on the XPA-1's, boy are they big buggXXX, they ARE JUST TOO big for me but the pleasure he is having makes me want to play with some XPA-1-L with my mini maggies, at 86DB efficiency, so according to watt i have read(spelling intentional) Watts SPL 1 ---- 86 dB 2 ---- 89 dB 4 ---- 92 dB 8 ---- 95 dB 16 --- 98 dB 32 -- 101 dB 64 -- 104 dB 128 - 107 dB 256 - 110 dB 512 - 113 dB so is the extra cost, weight and size worth an extra 3db for 100-103db of class A, i am sure they will be sweet and will be 110db before clipping, i a small room that would hertz :-) Mostly but don't forget about distance. Here is a great link to break it down for you. www.puiaudio.com/resources-white-papers-speaker-power.aspxThanks, |
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Post by zaphod2012 on Sept 13, 2012 19:44:35 GMT -5
thanks for the link, an excellent article :-)
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Post by chaosrv on Sept 13, 2012 22:32:33 GMT -5
now i see the mini maggies are 86db at 4ohms, so i guess that will be 104db of class A into 4ohms, unless i am interpreting these figures all wrong, am i going nuts? I don't think that is how the amp will work - I believe it is the first 30 watts in class A - regardless of 8 or 4 ohm load. So you'll be at 101 Anyone feel free to correct me. If I'm right my 90 db ML Vista's will be around 105db at 1m... or 99 at 2m. I'm probably right on the borderline for this amp...decisions decision. |
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Post by AudioHTIT on Sept 13, 2012 23:51:16 GMT -5
now i see the mini maggies are 86db at 4ohms, so i guess that will be 104db of class A into 4ohms, unless i am interpreting these figures all wrong, am i going nuts? I don't think that is how the amp will work - I believe it is the first 30 watts in class A - regardless of 8 or 4 ohm load. So you'll be at 101 Anyone feel free to correct me. If I'm right my 90 db ML Vista's will be around 105db at 1m... or 99 at 2m. I'm probably right on the borderline for this amp...decisions decision. The amp produces voltage, putting that across a load allows current to flow and a wattage to be generated. I would expect the amp to produce up to a specific voltage in Class A - maybe about 15.5 volts which would be 60 Watts with a 4 ohm load. If this amp has a limit on how much Class A current it can produce I could be wrong. |
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Post by AudioHTIT on Sept 14, 2012 0:08:21 GMT -5
now i see the mini maggies are 86db at 4ohms, so i guess that will be 104db of class A into 4ohms, unless i am interpreting these figures all wrong, am i going nuts? So to follow on my previous post with your 4 ohm 86 dB speakers you will still be at about 101 dB, because your 86 dB efficiency is actually measured at 2.83 volts which with 4 ohm speakers is 2 watts (so you have to lower all your dB's by 3). |
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;D
