Searching using google.com, the reply is a surprising:
Is this true about loadspeakers? What is the efficiency according to audiophiles? It also tells that the DC resistance of voice coils plays a crucial role and is very significant.
This is the equivalent circuit: https://audiojudgement.com/speaker-equivalent-circuit/
Is this true about loadspeakers? What is the efficiency according to audiophiles? It also tells that the DC resistance of voice coils plays a crucial role and is very significant.
This is the equivalent circuit: https://audiojudgement.com/speaker-equivalent-circuit/
Yes, signal heating the voice coil resistance does not contribute to the acoustical output.
And the voice coil is usually where most of the amplifier's output power is dissipated.
And the voice coil is usually where most of the amplifier's output power is dissipated.
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Another potentially significant loss of efficiency is in the way the transducer's diaphragm couples with the air, bigger size equals better total efficiency generally, all factors considered.
Mike
Mike
Yes loudspeakers are woefully inefficient. Take as reference that 1 watt of acoustic energy radiated into a sphere will give you and SPL of 120dB at a radius of 1M.
No loudspeaker is anywhere near that, although some will get near 10% by restricting the space into which the power is radiated. Narrow horns, for example.
No loudspeaker is anywhere near that, although some will get near 10% by restricting the space into which the power is radiated. Narrow horns, for example.
Take a look at https://en.m.wikipedia.org/wiki/Thiele/Small_parameters
Scroll down to "Other parameters" road read up on efficiency.
Scroll down to "Other parameters" road read up on efficiency.
Electrostatics are extremely efficient. No resistive dissipation, coupling to the air is quite good and extreme low moving mass.
However they make the amplifier inefficient, being a pure capacitance and requiring huge blind currents.
However they make the amplifier inefficient, being a pure capacitance and requiring huge blind currents.
Yes, speakers are inefficient.
But two speakers with the same dc resistance can have vastly different efficiency.
Modern low efficiency speakers, mass assembled in china, have big voice coil gap, to allow for large tollerances in mistakes, weak puny magnets, heavy cones and so on.
On the contrary, high efficiency speakers have light cones, light voice coil, small gap and very very strong magnet. Often requiring hand assembly.
Compare Lowther to any mass produced fullrange and you get the picture. DC resistance has almost nothing to do with efficiency.
Cheers.
