how efficient are they? anyone here can post an actual power consumption of a class d based amp/receiver?
my Onkyo 608 consumes 120w at high volume. 70w when on w/ no sound and less than 1w on standby. thinking of upgrading my avr to a class d based receivers if it can help reduce my electricity bill
Hi, my first post in technical thread, just new here in the forum. Its a good question as it is related to the concern of the world, about caring the mother earth, environmental friendly ---- ECO product or full eco product, energy start, which posses the idea of low power consumption.
Let me see :
Active high Power both channel driven : 120W
Active no music input : 70W
Standby Mode : <1W, say 0.80W
How did you measure the power, using wattmeter? I assume the power is the WATT, as there are 3 types of power we can have (signle phase household AC power), the Watt, VA and VARS. The Watt is the one we pay to Meralco.
Speaking only to my class D amplifier which was carefully design on our finger tips,
Active high Power "both channel driven" by sinewave at rated load @ the following power :
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Power Output Power meter Efficiency
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2W(rms) ouput = 10W, 20% effiicient
4W(rms) ouput = 12.45W, 32.12% effiicient
10W(rms) ouput = 19.77W, 50.5% effiicient
50W(rms) ouput = 80W, 62.25% effiicient
100W(rms) ouput = 134W, 74.6% effiicient
Note:
both channel driven means, both the L and R are simultaneously driven, the given power is in Stereo
Active no music input : 7.62 W
Standby Mode : 0.92W --- power down the amplifier
If I compare that with a class AB amplifier subjected in the same condition as above, at rated power of 100W(rms) stereo driven by sinewave, the efficiency I can get based on the same power supply is about 52.9%. The active mode without music is about 9.9 ~ 10.2W.
I used sinewave signal, using music test is harder for repeatability. I also did not take into account some loses in the power supply, which in reality, there are loses in the psu, but using the same PSU between a class-AB and class-D, that loses will be same, and I got a result that indicate how efficient is class D.
When I used my class-D amplifier at normal listening level for audiophile music, I can read the power from my Power meter about 8.49 ~ 10.5W (say 11W), with rock music with lots of Bass with the same volume level, I can read about 15~20W.
It is a different story of power consumption when using music as source, much lesser than using a sinewave signal., hope it can help