Flytrap1 Posted May 10, 2008 Share Posted May 10, 2008 I know or I think I know what 99dB @ 1watt/1meter means from my Heresy. But what does 97dB @ 2.83V / 1m mean on the RF-62 I am thinking of getting? Thanks Quote Link to comment Share on other sites More sharing options...
willland Posted May 10, 2008 Share Posted May 10, 2008 1 watt=2.83 volts Quote Link to comment Share on other sites More sharing options...
WMcD Posted May 11, 2008 Share Posted May 11, 2008 That voltage of 2.828 (to be a little more accurate) is actually the square root of 8. You can check this with a calculator Speaker systems or even individual drivers have input impedances or resistance which are not constant.. The resistance varies with frequency. Therefore, no speaker system I've seen reported is actually 8 ohms or 4 ohms. Very ofter they are described as 8 ohms or 4 ohms "nominal". Nominal means, in name only. This fact creates havoc when we need "one number" for testing. The solution is that by convention, we assume the speaker is an 8 ohm resistive load. Essentially an 8 ohm resistor. The equation for power delivered to a resistor is Power [in watts] = Volts x Volts / Resistance [in Ohms]. Therefore, we have find a value of a.c. volts to make that power work out to one watt. The value of 2.828 volts makes it work. 2.828 x 2.828 = 8. Then we have to divide by 8 ohms. And the result is 1 watt. Gil Quote Link to comment Share on other sites More sharing options...
Flytrap1 Posted May 12, 2008 Author Share Posted May 12, 2008 Thanks Quote Link to comment Share on other sites More sharing options...
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