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I also observed one thing, at resonance frequency of a sealed box, a low Qts driver actually produces less output. This can be explained by B*l*v because at the resonance peak, almost all voltage from amp output goes to back EMF, or B*l*v. However, higher B*l leads to lower v, this is what people refer to as stall effect. And that has completely changed my mind about low Qt. Even though low Qt gives us lower distortion, but the price to pay is very high. A system with Q=0.4 actually needs 4 times of power (X the voltage) to drive the driver to the same output of a Q=0.8.
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Interesting - that changes things. Appreciate that my electronics background (combined unfortunately with a total lack of knowledge about speaker design) is what drives my treating a speaker as a simple coil and magnet device. hehehe, it's why I usually avoid this area of the forum.
Seriously though, interesting stuff.
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Just think of this resistor as part of the voice coil resistance.
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Well OK, but that part offers its power output in heat and not sound. But in light of the quote above, it does change my tune somewhat.
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Damping factor is a notion of the past. If you look at the lumped resistance I mentioned above, which one is the major contributor?
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Yeah, and I agree even simple cable impedance can overwhelm the damping formula (with regard to amplifier o/p Z). I have read several articles that test various damping factors (derived from progressively higher lumped Rs values) with the resulting increase in Qes and Qts....... But, when you start adding five ohm blocks of resistance, with system damping less than one, I start to question whether the decaying signal will muddy the sound or not. You say no, OK, I have to believe you, since I have no experience in the field of speaker/driver design. I acquiesce on that point.
Anyway Brian, we appreciate your posting here, and hope you will do so in the future.
brucek