AVR specs question - AVS Forum | Home Theater Discussions And Reviews
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post #1 of 8 Old 10-13-2019, 02:56 PM - Thread Starter
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AVR specs question

I was looking for something in the datasheet of my AVR and noticed this:

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Does that mean it will/can never amplify anything < 20Hz and > 20Khz?

Also, the output power is listed as 130 Watt per channel, but 1 channel driven. How does that translate to effective power per channel when running a 5.1 setup? No idea how this should be interpreted..
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post #2 of 8 Old 10-13-2019, 03:05 PM
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It doesnt do only between it just shows that between those frequencies they are max +1 to -3dB off a perfectly flat response.

It would have been nice if they gave the powersupply spec.


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post #3 of 8 Old 10-13-2019, 03:10 PM
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Quote:
Originally Posted by Bnaan View Post



Also, the output power is listed as 130 Watt per channel, but 1 channel driven. How does that translate to effective power per channel when running a 5.1 setup? No idea how this should be interpreted..

It doesnt say very much at all, 6ohm 1kHz tone is a very misleading way to measure. It should at least be 8ohm 20hz-20khz. But all channels running is not that accurate either because the front 3 do a lot more than the rest (the .1 sub is active) so thats where you want the power, the surrounds or atmos channels need very little compared.
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post #4 of 8 Old 10-13-2019, 03:16 PM
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These specifications are very misleading, go to YouTube and watch the video by Audioholics on AVR power ratings. They do independent testing and are now calling on all makers to quote All Channels Driven values. 1 channel @ 6 Ohms is far from the more usual 2 channels @ 8 Ohms values, but still not as useful as 5 or 7 channel numbers.

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post #5 of 8 Old 10-13-2019, 08:27 PM
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The spec says up to 50 kHz. If you can hear in that range, you're a marvel of evolution.
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post #6 of 8 Old 10-14-2019, 10:55 AM - Thread Starter
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Thanks for the replies!
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post #7 of 8 Old 10-14-2019, 11:19 AM
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1 spec is for power bandwidth, the other spec is for frequency response.
The frequency response spec is always wider, but is based on much lower levels not rated power output..

Just my $0.02...
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post #8 of 8 Old 10-14-2019, 12:34 PM
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Frequency response will roll off, so aside from it actually saying 20Hz to 50kHz as already mentioned in a previous reply, it will actually amplify beyond that range (on both ends). Just that it will roll off so the response won't be flat. On the upper end a lot of the reason for that is capacitors (and inherent capacitance in transistors, and in cables and PCB traces and such) and may be intentional to prevent artifacts like ringing in some situations.


As for the x-channels-driven power, it really depends. The amplifier has a power supply that can supply only a certain amount of power, and each amp channel is rated separately. If the power supply can supply enough power for all of your amp channels, then you would have no difference in power regardless of how many channels driven. But in the real world, manufacturers save money, space, and weight by making the assumption that most people will never need to drive all of their channels to full power at any given time. But there is no specific formula for this, because it just depends on what the manufacturer does.


If they put a 500 watt power supply in, and you had 5 channels of 100 watt amplifiers, then you could do 100 watts per channel regardless of 1-5 channels. But if they put a 400 watt power supply in then you could do 100 watts into 4 channels, or 80 watts into 5 channels, etc. Actually it gets a bit more complex because we also have to discuss amplifier efficiency - the numbers above would apply to a 100% efficient amp (which doesn't exist). And an amp's efficiency varies.



(Don't use the power consumption rating on the back as the size of the power supply, either, because it's not an exact number.)
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