Speakerguy
Active Member
we've already explained to you, a higher impedance is no problem, just that it will be a LOT quieter.
Actually the two in series will be the same volume at the same drive voltage just with half the current You lose 3dB because you're only delivering half the power to the load, but you gain 3dB due to improved radiation impedance of using two speakers (the impedance match of a speaker diaphragm to the air load is horrible due to the relative masses, so doubling the area gives you twice the radiation gain). This is why horns exist - they're basically acoustic transformers. Hence why you see them where high efficiency is needed - stadiums, concert venues, etc. A traditional loudspeaker is so poor at converting electrical energy to acoustic energy that >99% of the power delivered will be dissipated as heat. Horns drop that figure to 90% or less depending on the design by improving the impedance match. (for reference, an acoustic watt is something like 112dB/1w/1meter, a typical loudspeaker will be 90dB/1w/1meter for efficiency).
Also, you get +6dB out of a parallel connection for voltage sensitivity for the same reasons.
I'm sure audioguru will come by and correct me if I'm wrong Which I tend to be a lot of the time...
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