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Post by Golden Ear on Jul 3, 2012 17:00:46 GMT -5
Interesting to see A/B amp with H? Any other company use this type of topology of both A/B and H?
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Deleted
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Post by Deleted on Jul 3, 2012 17:14:06 GMT -5
Interesting to see A/B amp with H? Any other company use this type of topology of both A/B and H? Class H is the power supply. Not the amp.
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Post by briank on Jul 3, 2012 17:17:12 GMT -5
I can't wait to hear this thing at Emofest. I'll be in my house then and might just be able to swing it.
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Deleted
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Post by Deleted on Jul 3, 2012 17:23:38 GMT -5
Love the look of it and the power specs but my days of 80+ lbs amps, are gone for ever.
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Post by Entity on Jul 3, 2012 17:27:10 GMT -5
I'm not sure if I'm a fan of the looks or not... I like the clean black front on the current X series stuff. The more I look at it though, the more it's growing on me. I think I need to see it stacked up with a bunch of other reference series stuff.
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Post by Dan Laufman on Jul 3, 2012 17:30:09 GMT -5
Well it's semantics. All Class H amplifiers typically have a Class AB amplifier as the gain element. The Class H refers to the power supply topology, so it's all in how you choose to look at it. If you turn off the Class H rail switching, the Class H amp is now a Class AB amp. We have a two rail design in the XPR-5. The low rail, which is what the amp is powered from on idle up to about 50% of the amps voltage swing, and then the high voltage rail with takes it all the way to maximum output. By sitting on the lower rail most of the time, quiescent losses are greatly reduced. The amp runs really cool under normal operation. But when you need it, the rails instantly switch to the high voltage mode and presto, a beast is born! There is a high speed comparator that looks at the input signal and predicts where the output is going, and when needed, it turns on the high voltage rail BEFORE the output gets there. You can't fool it, even with high frequency transients, as its switching time is faster than the rise time of a 20kHz signal. Sweet! So, you get the SQ of a really well designed Class AB amp, with a huge efficiency improvement, and no sonic downside. We've been building Class H amps for a long, long time and we have the control loop down pat. It's more expensive than Class AB, but at a certain power level, it's just the only way to go. You can't justify the power losses on an amp this big. There is really no down side to a well designed Class H amp. But remember, it's all in the details. You have to start with a great sounding amplifier stage. And the Class H controller has to be done very carefully in order to minimize sonic artifacts. When done correctly, (like in the XPR-5) the result is amazing. OK, step off of soapbox, and go have cocktail down by the pool in Florida... I'm supposed to be on vacation, so don't tell Cathy you saw me here... Cheers, Big Dan
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Post by Poodleluvr on Jul 3, 2012 17:31:15 GMT -5
Interesting to see A/B amp with H? Any other company use this type of topology of both A/B and H? en.wikipedia.org/wiki/Electronic_amplifier"Classes G and H" "There are a variety of amplifier designs that enhance class-AB output stages with more efficient techniques to achieve greater efficiencies with low distortion. These designs are common in large audio amplifiers since the heatsinks and power transformers would be prohibitively large (and costly) without the efficiency increases. The terms "class G" and "class H" are used interchangeably to refer to different designs, varying in definition from one manufacturer or paper to another." "Class-G amplifiers (which use "rail switching" to decrease power consumption and increase efficiency) are more efficient than class-AB amplifiers. These amplifiers provide several power rails at different voltages and switch between them as the signal output approaches each level. Thus, the amplifier increases efficiency by reducing the wasted power at the output transistors. Class-G amplifiers are more efficient than class AB but less efficient when compared to class D, without the negative EMI effects of class D." "Class-H amplifiers take the idea of class G one step further creating an infinitely variable supply rail. This is done by modulating the supply rails so that the rails are only a few volts larger than the output signal at any given time. The output stage operates at its maximum efficiency all the time. Switched-mode power supplies can be used to create the tracking rails. Significant efficiency gains can be achieved but with the drawback of more complicated supply design and reduced THD performance. In common designs, a voltage drop of about 10V is maintained over the output transistors in Class H circuits. The picture above shows positive supply voltage of the output stage and the voltage at the speaker output. The boost of the supply voltage is shown for a real music signal."
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Pauly
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Post by Pauly on Jul 3, 2012 17:35:00 GMT -5
so don't tell Cathy you saw me here... Cheers, Big Dan
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Post by Dan Laufman on Jul 3, 2012 17:36:19 GMT -5
It only hurts when you move it. Once it's set up, bliss. Plus, at 80+ pounds, it'll be right where you left it next time go looking for it! No worries about the kids running off with it, or the neighbors borrowing it... or anyone stealing it!!! I don't see any downside!
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Pauly
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Post by Pauly on Jul 3, 2012 17:38:04 GMT -5
Don't worry Dan. I'm sure plenty of guys are about to press the order button soon. They're just trying to figure out how to sneak this guy past their wife.
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Post by GreenKiwi on Jul 3, 2012 17:47:37 GMT -5
My only worry is all the neighbors wondering if someone's been executed when this puppy gets turned on =D
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Post by Deleted on Jul 3, 2012 18:03:19 GMT -5
It only hurts when you move it. Once it's set up, bliss. Plus, at 80+ pounds, it'll be right where you left it next time go looking for it! No worries about the kids running off with it, or the neighbors borrowing it... or anyone stealing it!!! I don't see any downside! Only for the fact I move around my cabinet at least once a week to clean and it's freaking heavy and extremely hard to move by myself as it is, let alone adding another 100lbs to it lol That is not going to be very many people issues but it is mine. well that and the fact I already have a 500x7 amp sitting in there lol. i really do love the look enough that it makes me want to get one for my upstairs HT! Though I'll wait and see what you guys do with the processors. I'd liek to have a sweet matching processor to replace my upstairs denon 4311, so I can move that to my bedroom!
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Post by peterk on Jul 3, 2012 18:13:25 GMT -5
I need to replace my receiver and sure wish the RMC processor was available!! That and this new amp would be PERFECT!!!!!!!!! Will probably drag into next year for the new processor. Patience is a virtue I just don't have.
This new XPR-5 is really nicely priced. Compare it to Class D combo amps like W4S and this is $1500 less!
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Post by muzicianx on Jul 3, 2012 18:21:27 GMT -5
Congrats on the release of the new series! Looking forward to seeing/hearing it at EmoFest. So does the $1799 cost include the new rack I will have to buy and the medical costs for moving it? Enjoy your cocktail in FL, headed there next week for vacation as well.
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Erwin.BE
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Post by Erwin.BE on Jul 3, 2012 18:33:46 GMT -5
Probably the processor... but hey, whatever I say will get me into hot water! The XPR-2 is nearly ready, followed closely by the XPR-1. Preamp and processor are not as far along, but substantial work HAS been done on both, and they ARE coming... for sure. Our goal is simple; One brand to rule them all. We're like BMW, start with a 1 Series and move your way up to a big ol' 7 Series!! Cradle to grave. That's us!! Funny: we are now a triple BMW family since we got a brand new BMW 116d Efficient Dynamics (frugal 1,6 diesel consuming a real world 56 mpg) for the adolessent kids. Folks who viewed the house build pics know which beemer I drive myself. What am I getting at? I just love the look and the specs of the new XPR-5! But I won't be getting a Emo processor unless it's a full 11.2! Marantz just announced the AV8801 (3,000 euro) and that's what we are going to get unless Emotiva proposes it's own 11.2 DSX processor... Or else Auro-3D will do. But accept my sincerest congratulations on the XPR beast. BTW: I just made my HT design 10.2 instead of 11.2 since two XPR-5 is enough ;D One back surround will have to do!
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Post by Entity on Jul 3, 2012 19:35:52 GMT -5
LOL, I just had a picture in my head of someone trying to steal one. I think they'd skip that item and move on to the lighter stuff.
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Post by sharkman on Jul 3, 2012 19:38:54 GMT -5
Well, I guess congratulations are in order! But 400 watts per channel is something I'll never need, and I suspect about only .01% of home theater owners would need. And I recently strained my back moving my 60 lb Parasound amp around, so I guess that's my limit.
But I'm sure it'll be a blast to play!
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jamrock
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Post by jamrock on Jul 3, 2012 19:56:15 GMT -5
It only hurts when you move it. Once it's set up, bliss. Plus, at 80+ pounds, it'll be right where you left it next time go looking for it! No worries about the kids running off with it, or the neighbors borrowing it... or anyone stealing it!!! I don't see any downside! Only for the fact I move around my cabinet at least once a week to clean and it's freaking heavy and extremely hard to move by myself as it is, let alone adding another 100lbs to it lol That is not going to be very many people issues but it is mine. well that and the fact I already have a 500x7 amp sitting in there lol. i really do love the look enough that it makes me want to get one for my upstairs HT! Though I'll wait and see what you guys do with the processors. I'd liek to have a sweet matching processor to replace my upstairs denon 4311, so I can move that to my bedroom! You can get furniture sliders at just about any local hardware store. Regardless of the weight, you can push a rack full of components around with just 1 finger, or more likely, one hand. For my UPA-7, I placed sliders under the rear rubber feet. That way, I just tilt the front upwards and am able to easily slide it in and out of the cabinet. I only wished that the XPR-5 was an XPR-7 ;D
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Post by edoggrc51 on Jul 3, 2012 19:56:38 GMT -5
Love the look of it and the power specs but my days of 80+ lbs amps, are gone for ever. Quit being a sissy lala Nate. The XPR is a lightweight compared to my 125lb Cinenova. But 400 watts per channel is something I'll never need, and I suspect about only .01% of home theater owners would need. I must be in that .01% then. ;D Just curious, have you had the chance to try out a high powered amp in your system before?? You might be surprised at the results.
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Pauly
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Post by Pauly on Jul 3, 2012 20:04:48 GMT -5
Love the look of it and the power specs but my days of 80+ lbs amps, are gone for ever. Quit being a sissy lala Nate. The XPR is a lightweight compared to my 125lb Cinenova. But 400 watts per channel is something I'll never need, and I suspect about only .01% of home theater owners would need. I must be in that .01% then. ;D Just curious, have you had the chance to try out a high powered amp in your system before?? You might be surprised at the results. Wow, the Cinenova weighs almost as much as the motor in our bikes, Eric ;D
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