"Arfa Daily" wrote in message
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"Bob Mannix" wrote in message
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"Dave" wrote in message
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Hi all.
I'm sorry if this seems OT but I hope someone can still help.
Anyone know how to convert EIAJ into RMS values?
Say if you have an amplifier stating as having 230W EIAJ power, any idea
what that might be in RMS?
I've tried Googling but nothing of sense comes up.
Cheers in advance.
Wavey Dave

It depends on the voltage range, I guess, as it's defined as follows:

Maximum EIAJ standard test output power: average of RMS output voltage
squared divided by load impedance.

Don't know what the test conditions are for this though. Probably safe to
say roughly the same as RMS power depending on how you drive it.


--
Bob Mannix
(anti-spam is as easy as 1-2-3 - not)


Who on earth comes up with this stuff ? I'm sure it must have made some
sense to the person at the time, but dear me, average of RMS ? Squared ?
Divided by load impedance ? Should it also have "multiplied by the outside
air temperature and divided by the number of channels cubed, minus the
number you first thought of" in there as well ... ?


Well, why I'm not sure, but calculating power as voltage squared over
impedance is perfectly reasonable and no cause to bring in the air
temperature! It's some sort of average that takes into account the dynamic
voltage range of the system. Not that I care, but someone might.

As to the loudness of speakers, efficient speakers are loud and low quality,
high quality speakers are inefficient and quieter (generally speaking) so
you make your choice. Notting Hill Carnival sound system, go for efficiency
and b*gg*r the fidelity, you want to rattle windows, Self absorbed, anally
retentive, solo, esoteric hi-fi listening, low efficiency speakers and big
amps ;o) !


--
Bob Mannix
(anti-spam is as easy as 1-2-3 - not)