Amplifier Math

avphile
avphile Posts: 38
edited January 2011 in Electronics
If my pre processor (Pioneer 84TXsi) volume settings goes from -85dB to 0dB. And my amplifier (Sunfire TGA5200) is rated at 200WPC into 8Ohms. Assuming that the speaker load remains 8Ohms over the entire frequency range (0-20KHz). Is this correct

Pioneer w/o Amp
140/85 = 1.65 W per dB volume.

Pioneer w/ TGA5200
200/85 = 2.35 W per dB volume.

Pioneer w/ TGA7400
400/85 = 4.71 W per dB volume.

Therefore, the sound will be louder if I have a higher wattage amplifier. But the problem is that the loudness I am hearing is not that significant.:confused:
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Comments

  • Glowrdr
    Glowrdr Posts: 1,103
    edited January 2011
    I'm probably the wrong person to answer this, but let me ask a question and see if this points you in the right direction.

    Is the power of the amp stackable? What I mean by this, is the AVR itself is 140 watts. Your amp is 200 watts. Correct me if I'm wrong, but I believe if you're using the amp - you are using 200 watts (not 340)

    I could be completely wrong, but this is what comes to mind for me.
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  • bobman1235
    bobman1235 Posts: 10,822
    edited January 2011
    I don't think that's correct. dB is a logarithmic thing, not a linear one, so the math just wouldn't work like that.
    If you will it, dude, it is no dream.
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