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Post by T99 on Mar 21, 2014 2:06:16 GMT -5
Just curious,
I only see info listed for the 120V/20A dedicated circuit. If the XPR series amplifiers are connected to 220V, do you still recommend 20A or can it be stepped down to 15A or even 10A. I already have dedicated lines for amplifiers using 14-2 copper @ 120V /15A. In other words, if I retask the exisiting wire for 220V / 15A will I get added benefit or should I pull new cable?
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Post by bolle on Mar 21, 2014 3:53:40 GMT -5
The manual of the PA 7-350 e.g. (in fact a XPR-7) mentions a 220V/30A line to get the FULL power output under lab conditions when all channels are driven with sine waves at the same time... So do the math.  |
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Post by T99 on Mar 21, 2014 4:51:00 GMT -5
Thanks Bolle,
Sometimes I tend to over analyze the situation. Although the 14AWG wire maths out to the more power @ 230V / 15A. I might as well upgrade to at least 12AWG for this. I know that under "normal" listening conditions, you will never drive all channels to peak output. I just don't want to starve the amplifier's power supply of current.
Thanks again, your response has helped greatly.
T99
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Post by bolle on Mar 21, 2014 6:26:40 GMT -5
No problem.  I use the PA 7-350 on a normal 230V/16A line together with all my other equipment without any problems. |
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Post by T99 on Mar 24, 2014 8:07:12 GMT -5
Will there be an issue using the XPR-5 powered at 220v to a pre/pro powered at 115v? I will be using balanced inputs to the amplifiers.
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Post by Gary Cook on Mar 24, 2014 19:30:46 GMT -5
Will there be an issue using the XPR-5 powered at 220v to a pre/pro powered at 115v? I will be using balanced inputs to the amplifiers. Nope. Back to the main subject, the maths is simple 110 volts at 10 amps is 1,100 watts 110 volts at 15 amps is 1,650 watts 110 volts at 20 amps is 2,200 watts 220 volts at 10 amps is 2,200 watts 220 volts at 15 amps is 3,300 watts Emotiva recommends 110 volts at 20 amps (ie; 2,200 watts) so your 220 volts at 15 amps (ie; 3,300 watts) is 50% more than Emotiva recommends, seems like plenty to me. Too bad we can't buy XPR amps shipped to Australia, our standard home circuits are 240 volts at 15 amps (ie; 3,600 watts). Cheers Gary |
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Post by T99 on Mar 25, 2014 23:49:31 GMT -5
I didn't think so.
I understand the "Ohm's law for AC" portion for the incoming power. I just wanted to make sure that there wouldn't be some sort of mismatch with my preamp. I'm looking to purchase an XPR-5 soon and want to get my power to my theater in order before the amplifier gets here. I agree totally with you, the Australian version would be perfect for use here. The reason for my original post was for me to be clear on the prerequisites needed for a CLASS H power supply. As I mentioned before I over analyze most of the time. And this time, it's truely a first for me. I have always been able to audition the equipment prior to purchase. Buying something of this magnatude sight unseen or heard is new. It's ironic that being that I work for at HT dealer, and have access to brands like Parasound, Anthem, and McIntosh that I look elsewhere. Almost everyone has good things to say about Emotiva. The sound quality, build quality, and last but not least, the price. I plan to try them.
Thanks Gary for your input. And your response.
It is very much appreciated!
T99
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Post by bolle on Mar 27, 2014 6:57:15 GMT -5
Well, you don´t have 100% efficiency and e.g. a XPR-5 has 5x600W at 4 ohm, which sums up to 3000 watts. The PA 7-350 has the same power section as the XPR-5, has 7x550W at 4 ohm, which sums up to 3850 watts. Emotiva says that the 7-350 will pull up to 6000 watts from the line under lab conditions while feeding a sinewave to all channels at the same time with a 4 ohm load connected. 3850 / 6000 = 64,17% efficiency at maximum power output. So to theoretically max out the XPR-5 you would need a line capable of delivering 3000 / 0,6417 = 4675 watts. Just sayin... Of course you will never reach or come even close to those levels while listening to music or movies! |
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Post by T99 on Mar 27, 2014 14:17:09 GMT -5
Yes, I agree. no one ever would see the peak conditions. I will get to enjoy an XPR-5 in about a week. I'm looking forward to pairing it with my Yamaha CX-A5000. I just wish I could afford to get the 2 other surround back channels too. I know that it's WAAAAAAAAAY to much power for my Definitive speaker system but I'm looking to start building custom line array speakers soon. They will require a bit more juice.
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bootman
Emo VIPs 
Typing useless posts on internet forums....
Posts: 9,358
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Post by bootman on Mar 27, 2014 14:45:01 GMT -5
That A5000/XPR-5 is going to be sweet.
Please post impressions and don't forget your speaker build!
Many here enjoy DIY threads very much.
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Post by dally on Mar 27, 2014 15:08:34 GMT -5
Will there be an issue using the XPR-5 powered at 220v to a pre/pro powered at 115v? I will be using balanced inputs to the amplifiers. Nope. Back to the main subject, the maths is simple 110 volts at 10 amps is 1,100 watts 110 volts at 15 amps is 1,650 watts 110 volts at 20 amps is 2,200 watts 220 volts at 10 amps is 2,200 watts 220 volts at 15 amps is 3,300 watts Emotiva recommends 110 volts at 20 amps (ie; 2,200 watts) so your 220 volts at 15 amps (ie; 3,300 watts) is 50% more than Emotiva recommends, seems like plenty to me. Too bad we can't buy XPR amps shipped to Australia, our standard home circuits are 240 volts at 15 amps (ie; 3,600 watts). Cheers Gary We actually do have 240 volts in the U.S. Too. Standard U.S. Household current is 120/240 volts. 110/220 is the lowest allowable voltage due to line sag. The power comes out of the substations at 120+ volts. 110/220 is leftover from the days when the power grid was not up to the standards it is today. |
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Post by Gary Cook on Mar 27, 2014 17:03:57 GMT -5
Nope. Back to the main subject, the maths is simple 110 volts at 10 amps is 1,100 watts 110 volts at 15 amps is 1,650 watts 110 volts at 20 amps is 2,200 watts 220 volts at 10 amps is 2,200 watts 220 volts at 15 amps is 3,300 watts Emotiva recommends 110 volts at 20 amps (ie; 2,200 watts) so your 220 volts at 15 amps (ie; 3,300 watts) is 50% more than Emotiva recommends, seems like plenty to me. Too bad we can't buy XPR amps shipped to Australia, our standard home circuits are 240 volts at 15 amps (ie; 3,600 watts). We actually do have 240 volts in the U.S. Too. Standard U.S. Household current is 120/240 volts. 110/220 is the lowest allowable voltage due to line sag. The power comes out of the substations at 120+ volts. 110/220 is leftover from the days when the power grid was not up to the standards it is today. I understand, we also have voltage deviation, I've seen as low as 232 volts and as high as 253 volts. BTW, as well as the standard 240 volts at 10 amps 15 amps and 20 amps we also have the option of 3 phase which gives us 420 volts. Cheers Gary |
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Post by T99 on Mar 28, 2014 14:34:18 GMT -5
I love the electronics, electricity, and math of it all. ALMOST as much as great sound... Now all I have to do is wait for PayPal to transfer my funds so I can order...
T99
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Post by Sam 7-350 on Sept 18, 2014 5:37:13 GMT -5
My 7-350 is on a dedicated 220V/30A circuit. However, I am faced with a bit of a dilemma. As I get voltage fluctuations in the power grid, I am thinking of incorporating a voltage stabilizer to get constant 220V at all times. The problem I have is that a 20A stabilizer is reasonably priced but a 30A stabilizer is proving to be far too expensive.
I know lab conditions demands proper 30A at 220V for optimal results but will a 20A stabiliser in the mix be sufficient for movies and music considering the fact that I will be using seven 4 ohm speakers ?
Any help will be appreciated.
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Post by jackpine on Sept 18, 2014 7:33:41 GMT -5
Well, you don´t have 100% efficiency and e.g. a XPR-5 has 5x600W at 4 ohm, which sums up to 3000 watts. The PA 7-350 has the same power section as the XPR-5, has 7x550W at 4 ohm, which sums up to 3850 watts. Emotiva says that the 7-350 will pull up to 6000 watts from the line under lab conditions while feeding a sinewave to all channels at the same time with a 4 ohm load connected. 3850 / 6000 = 64,17% efficiency at maximum power output. So to theoretically max out the XPR-5 you would need a line capable of delivering 3000 / 0,6417 = 4675 watts. Just sayin... Of course you will never reach or come even close to those levels while listening to music or movies! Look on the back of your equipment usually near the power cord for for the power requirement. The back of the XPR-5 states 3500W. |
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Post by Sam 7-350 on Sept 18, 2014 13:31:01 GMT -5
My 7-350 is on a dedicated 220V/30A circuit. However, I am faced with a bit of a dilemma. As I get voltage fluctuations in the power grid, I am thinking of incorporating a voltage stabilizer to get constant 220V at all times. The problem I have is that a 20A stabilizer is reasonably priced but a 30A stabilizer is proving to be far too expensive. I know lab conditions demands proper 30A at 220V for optimal results but will a 20A stabiliser in the mix be sufficient for movies and music considering the fact that I will be using seven 4 ohm speakers ? Any help will be appreciated. Guys, I need help because I am in the process of installing my gear and need to make the right decision. |
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Post by audiosyndrome on Sept 18, 2014 15:35:27 GMT -5
Key factor missing from all the posts in this thread. The wire gauge. For a very long run, 220-240 volts is optimal; half the current draw, half the voltage drop (sag in the line).
Russ
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Post by audiosyndrome on Sept 18, 2014 15:42:27 GMT -5
No way the XPR-5 if 67% efficient; even at full-load. 50% would be a stretch. And power is not simply amps times volts. Normally the current and voltage are out-of- phase. This can easily knock off another 10-15% efficiency.
Russ
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Post by Gary Cook on Sept 19, 2014 0:41:46 GMT -5
My 7-350 is on a dedicated 220V/30A circuit. However, I am faced with a bit of a dilemma. As I get voltage fluctuations in the power grid, I am thinking of incorporating a voltage stabilizer to get constant 220V at all times. The problem I have is that a 20A stabilizer is reasonably priced but a 30A stabilizer is proving to be far too expensive. I know lab conditions demands proper 30A at 220V for optimal results but will a 20A stabiliser in the mix be sufficient for movies and music considering the fact that I will be using seven 4 ohm speakers ? Any help will be appreciated. How much are the fluctuations in the power grid? At my parents 60 year old house our nominal 240 volts varies between 252 volts and 218 volts. My Emotiva gear never shows any difference. That's an XPA-2 , XPA-3 and XPA-5 for power amps plus a UMC-200, ERC-3 and an OPPO 103. All plugged into the same circuit and at party volumes. My view, a power conditioner only makes thing worse, never better, because of their solid limitations. Cheers Gary |
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Post by Sam 7-350 on Sept 19, 2014 0:56:29 GMT -5
Anyone here that can provide input, I will really appreciate it.
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I use the PA 7-350 on a normal 230V/16A line together with all my other equipment without any problems.
