Its not about impedance of the speakers per se, rather on how efficient they are in converting electrical watts into acoustic decibels.
Speaker sensitivities are usually quoted as decibels per watt at 1 metre distance. So a typical 95 dB/W/m speaker will produce 95 decibels for 1 watt of power at a 1 metre distance.
Now. The sound pressure decreases at 1 over the distance squared. So 95 dB for 1 watt at 1 metre becomes about 24 or 25 decibels at 2 metres and just 10 decibels at 3 metres.
Speaker sensitivities are usually quoted as decibels per watt at 1 metre distance. So a typical 95 dB/W/m speaker will produce 95 decibels for 1 watt of power at a 1 metre distance.
Now. The sound pressure decreases at 1 over the distance squared. So 95 dB for 1 watt at 1 metre becomes about 24 or 25 decibels at 2 metres and just 10 decibels at 3 metres.
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