That type of matching requires at Volt meter, not SPL. Just FYI.
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CD vs hi-res
- Thread starter David Harper
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Nope. It's the SPL we perceive, not the volts.
Of course, but level-matching by SPL meter isn't sufficiently precise. Measuring and matching with a voltmeter can get you far more precise level matching (a couple of tenths of a dB vs a half dB to full dB with SPL meter).
ribonucleic
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how do you develop a precise voltage/volume relationship?
I'm not sure I follow what you're asking. Volume to voltage is determined by the speaker's response.
mhardy6647
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Do you mean sensitivity (output SPL in dB at a given distance from the loudspeaker - usually 1 meter - vs. input audio power in watts)?
Input power in watts can be calculated from the input signal voltage if the impedance is known. P = E^2/Z (E in AC volts RMS)
e.g., 2.83 VAC into 8 ohms is 1 watt
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There is an inherent relationship between volts at the speaker terminal and SPL out of the speaker. There are interfering factors using an SPL meter. So using a voltmeter is more precise.
For instance double voltage is 6 db louder SPL.
Also since there is an inherent SPL output with a given speaker input voltage when you match different sources to have the same voltage at the speaker with a test tone, then you automatically have matched the SPL volume (assuming the two devices have flat frequency response). Oh, and btw, use something like a -20db from full scale test signal or you might damage the speakers.
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