It all makes sense.
But was surprised at how cleanly the mechanical resonance showed up in the electrical test,
looking for all the world like an LC circuit.
Not something I had thought a lot about.
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On Thu, Mar 22, 2018 at 10:00 pm, Raj vu2zap wrote:
Jerry,
The speaker is like a LC circuit and it has a resonance. The frequency is dependant on the
mass of the cone and the elasticity of the suspension (including the enclosure air).
The for formula is the same as LC resonance.
To determine the mass I used to measure the first a peak in voltage and then attach a
know weight like 1gram and get a second peak. Using these two we can calculate the
mass of the cone and with that know the elasticity.
I used to change the resonance by spray painting the cone a little! I have seen woofers
that had paint and sand type particles on the cone to increase its mass!
In bass reflex the box and the duct has it own resonance which shows up in the tests.
