Hybrid Car – More Fun with Less Gas

Efficiency of radios - Page 3

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Posted by Eeyore on January 25, 2009, 7:29 pm
 


ransley wrote:


PA (sound reinforcement) speakers regularly have sensitivities of >
100dB/Watt @ 1 metre. Hi fi speakers can be as low as 80dB. That's a ONE
HUNDRED times difference in power required for the same volume.

Graham



Posted by ransley on January 27, 2009, 1:22 am
 
wrote:

True, point is to shop by sensitivity or efficency.

Posted by Eeyore on January 25, 2009, 7:26 pm
 

JimChufff wrote:


CAR stereos are pretty inefficient since they don't have to be otherwise
with a stonking great alternator to power them.

Something designed for portable use would doubtless fare better.

Graham


Posted by NotMe on January 25, 2009, 8:36 pm
 
: Hi all,
:  I live on a boat (off grid) and most of our electricity goes on
: running an inverter that runs our stereo system. Does anyone know how
: efficient car radios are? (we have 12v batteries) Or maybe the little
: 9v radios you get with mains adapters?
:

Following is an over simplification but generally:

Audio amplifiers are designed to operate in the best audio quality mode with
is 'class A'  these are by definition not enercy efficient.

Speakers likewise are designed for performance not efficiency.



Posted by Eeyore on January 25, 2009, 8:48 pm
 

NotMe wrote:


Not true of Sound Reinforcement speakers.

Graham



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