HOW TO UNDERSTAND DIFFERENT IMPEDANCE RATES?!!!

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#2650

From: Luc.vanHoye
Date: Tue, 03 Jun 1997 00:00

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I am trying to figger out if the impedance of an audio device has
something to do with how loud its signal can go...

for example:

I have a Roland XP80 (the audio device) which allows headphones with an
impedance between 8-150 Ohms.

Now, is it so that if I should use an 20 Ohms headphone I will probably
get a louder signal then if I should use a headphone with an 150 Ohms
impedance?!

Could anyone explain me how this works and what people mean if they say
that a headphone is 'hard to drive'?! 

Second, if I have the option, is it always better to chose a headphone
with low impedance?
 
I would really appreciate it if somebody could explain this to me!
Thanks in advance!

Regards,

Luc van Hoye.

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From: Luc.vanHoye@ping.be
Subject: HOW TO UNDERSTAND DIFFERENT IMPEDANCE RATES?!!!
Date: 1997/06/03
Message-ID: <33935466.1CC@ping.be>
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Newsgroups: sci.electronics.design,bionet.audiology,rec.audio.misc,rec.audio.opinion