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Post by ausman on Nov 21, 2022 17:43:42 GMT -5
xpa in a 14 channel variant is the current power supply in the xpa series capable of driving 14 channels???
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Post by AudioHTIT on Nov 21, 2022 18:37:38 GMT -5
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Post by geebo on Nov 21, 2022 19:39:30 GMT -5
xpa in a 14 channel variant is the current power supply in the xpa series capable of driving 14 channels??? The power supply is capable of delivering 3kW of power so yes, it has enough power to feed 14 channels in a 7x2 configuration. |
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Post by ausman on Nov 24, 2022 20:38:33 GMT -5
okay thought i ask before committing to a build, don't want to build something only to find the psu wasn't up to the task of driving 14 channels
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Post by leonski on Nov 24, 2022 22:21:01 GMT -5
Still a 'maybe'. HUGE room? Very low sensitivity speakers? NO.
You'd need to supply a little more inforation.
3KW for 14 channels is about 200 watts+ per channel AVAILABLE.
but given max of maybe about 50% efficiency.....You won't get 100 watts per channel available.....Maybe higher sinnce the available power is shared and
if other channels aren't using much, a couple channels can use MORE.....
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Post by ausman on Nov 25, 2022 0:20:06 GMT -5
not looking high power for height and wides was looking for a atmos setup didn't want to kill a psu overloading it..
7 main
14 secondary
6 subs
50--100 watts per channel 75-85 watts at most
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Post by leonski on Nov 25, 2022 1:31:09 GMT -5
couple'a things? First? I'm no HT expert. And I don't 'get it' except perhaps at a very high level.....which I simply do NOT have the proper space for OR the Money.
that being said, I understand that common practice is to have more power for the front 3 speakers.....R/L/Center......I would TEND to think a good 3-channel amp for this purpose.
The remainder? I think your power / benefit /packing idea is in the right direction.
One thing I'd certainly consider? Dropping a dedicated circuit or more.......to the amps, at least, and perhaps the rest of the system, as well......
Given that you will use only a couple watts per speaker other than the 3 'mains', the chances of overloading a PS are near-zero.....Even with low sensitivity speakers
and the fact that from plug to speaker, an A/B amp is 50% or less efficient.....lower efficiency at lower power as 'housekeeping' becomes a higher percentage of consumed power.....
You STILL won't be into it for more that 300 to 400 watts......That's gonna be pretty loud. I hope you have tolerant neighbors.....
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KeithL
Administrator 
Posts: 10,274
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Post by KeithL on Nov 25, 2022 2:27:42 GMT -5
I'm going to throw one more detail in here. The power supply we use in the XPA and XPA-DR amps is indeed able to deliver between 2.5 kW and 3 kW. But, in addition to that, it is also fully regulated. Most unregulated power supplies experience a drop in their output voltage and an increase in output ripple as the load gets more extreme. This is the reason why virtually all modern preamps and source components use regulated power supplies; because they perform better. (And it isn't especially difficult or expensive to build relatively small regulated power supplies.)
However, because large regulated power supplies have traditionally been physically large, heavy, and very expensive to build, they are rarely used in power amplifiers. (Specifically, while the power supplies in most Class D amplifiers are regulated, you will almost never find a Class A/B amplifier that features a regulated power supply.)
This is one reason for the tradition of "overbuilding" power supplies - so that they are never actually run close enough to their limits to seriously compromise their performance. In contrast, a fully regulated power supply, like the one we use, will deliver exactly the same rail voltage, and the same perfectly clean power, right up until it actually reaches its limits. |
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Post by davidl81 on Nov 25, 2022 9:42:55 GMT -5
not looking high power for height and wides was looking for a atmos setup didn't want to kill a psu overloading it.. 7 main 14 secondary 6 subs 50--100 watts per channel 75-85 watts at most Just curious, what pre/pro are you using that can handle that many channels? Overall though, yes the PS will not have any issues running the 14 “smaller” channels. |
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Post by ausman on Nov 25, 2022 22:14:36 GMT -5
emotiva most likely an extended sound board height and wide use
my concern keith was tripping the amp circuit protection if i went to a 14 channel atmos speaker setup with dedicated7 chan setup for main speaker
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