Guitar speakers, burn-in vs no burn-in
Автор: Mats Frånlund
Загружено: 2014-12-20
Просмотров: 7276
Описание:
Two pairs of new Eminence Legend guitar speakers, one in each pair was burned-in for 12 hours.
I used a 24V 50Hz signal from a transformer. The 50W GB12 used approx. 600 mA @ 16 Ohm,
that makes about 14W, nearly 1/3 of speaker power rating. The 120W V12 used approx. 1000 mA (1A),
that makes 24W, roughly 1/5 of speaker power rating.
Some people think that if one knows the nominal speaker impedance, lets say 16 Ohm,
and the voltage, lets say 24 Volt, then one can calculate the consumed power using
P = (Voltage x Voltage) / Impedance. That is not correct.
Here's why: The speaker impedance varies quite a lot depending on frequency.
And at the speaker resonance frequency the impedance can be roughly 5 - 10 times higher than
nominal impedance. So if one think that (24 x 24) / 16 is 36W at 50Hz, then think again if the speaker
impedance actually is 160 Ohm at 50Hz...
So, to make a much more accurate calculation: measure both AC voltage AND current
and use P = Voltage x Current. Then you can also calculate the speaker impedance at the
frequency used, by using Z = U/I. For my GB12 the impedance at 50Hz is 40 Ohm,
for the V12 it is 24 Ohm.
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