[sdiy] inductors, B fields, and confusion

rkmoore at memphis.edu rkmoore at memphis.edu
Sat Jun 12 05:27:51 CEST 2004


Hello everyone,

I've got a bit of a physics question that applies to an electroacoustic 
project that I'm trying.  It's not exactly this, but this is the best 
analogy of the problem without going into details:

Which will sound louder, an amp driving a speaker cabinet with two 16 
ohm speakers wired parallel, or the same amp driving two 4 ohm speakers 
wired in series?  In both cases the amp is running at an 8 ohm load.  
The assumptions to take into account are that the voice coils of the 
speakers have the same diameter for all of the speakers and the gauge 
of the voice coil wire is all the same.  Also, the magnet weights are 
the same.  Consequently, there should be four times as many turns of 
wire in the voice coils of the 16 ohm speakers than in the 4 ohm ones.  
Does this mean that the magnetic field strength for the 16ohm speakers 
will be stronger for a given current than the B field generated in the 
4 ohm speakers?  

Does this mean that the 16 ohm speakers would be louder or am I 
skipping something?  Is there some sort of physical saturation point 
that I'm ignoring? 

confused,
Richard





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