Yes, putting a resister in series with your speaker will raise the total Q, by virtue of raising the electrical Q of the system (amp-resistance-speaker) In other words, it lowers the damping of the woofer's self resonance (lowers the damping factor of the system)
The electrical q is based on the resonance of the speaker when driven by a zero impedance source (if you tap the cone with terminals shorted together and listen, it'll sound dead - highly damped) The reason the q isn't zero is because the speaker itself has its own impedance that is in series with the zero impedance source. If the q were zero, it wouldn't be resonant. Electrical q's are usually low - less than 1
The mechanical Q is based on the resonance of the speaker's suspension, and can be seen as the resonance characteristics of the speaker when its terminals aren't connected to anything. Mechanical q's are usually high - greater than 1. Tap on the cone and listen and you'll hear it ring.
The total Q is the combination of the electrical and mechanical Q's, and is dominated by the smaller of the two values. - the electrical q. Raising the electrical q just a little will have a pronounced effect on the system.
Yes, putting a resister of the same resistance is the rated impedance of the speaker will cut the power to the speaker by about 4 times (half the current at half the voltage is 1/4 of the power)
Since the speaker will have a higher impedance around its resonance, the effect of the resister will be less around the resonance frequency....making a peak in the response. That may actually be desirable in the rear of the car) the less directional bass remains at almost the same volume as it would be without the resister, while the the rest of the audio is attenuated, thereby shifting the sound stage toward the front .
It's a way to raise the Q and lower the efficiency by design. It's usually a parasitic drag on a design that should be accounted for or taken advantage of in the design....ie...DC resistance of coils, etc...resistance of wiring, parasitic self resistances in cheap, high value nonpolarized capacitors, etc....
In the car, the DC resistance of the stock speaker wires may be enough or almost enough by itself to protect the source from a 2 ohm speaker.
The electrical q is based on the resonance of the speaker when driven by a zero impedance source (if you tap the cone with terminals shorted together and listen, it'll sound dead - highly damped) The reason the q isn't zero is because the speaker itself has its own impedance that is in series with the zero impedance source. If the q were zero, it wouldn't be resonant. Electrical q's are usually low - less than 1
The mechanical Q is based on the resonance of the speaker's suspension, and can be seen as the resonance characteristics of the speaker when its terminals aren't connected to anything. Mechanical q's are usually high - greater than 1. Tap on the cone and listen and you'll hear it ring.
The total Q is the combination of the electrical and mechanical Q's, and is dominated by the smaller of the two values. - the electrical q. Raising the electrical q just a little will have a pronounced effect on the system.
Yes, putting a resister of the same resistance is the rated impedance of the speaker will cut the power to the speaker by about 4 times (half the current at half the voltage is 1/4 of the power)
Since the speaker will have a higher impedance around its resonance, the effect of the resister will be less around the resonance frequency....making a peak in the response. That may actually be desirable in the rear of the car) the less directional bass remains at almost the same volume as it would be without the resister, while the the rest of the audio is attenuated, thereby shifting the sound stage toward the front .
It's a way to raise the Q and lower the efficiency by design. It's usually a parasitic drag on a design that should be accounted for or taken advantage of in the design....ie...DC resistance of coils, etc...resistance of wiring, parasitic self resistances in cheap, high value nonpolarized capacitors, etc....
In the car, the DC resistance of the stock speaker wires may be enough or almost enough by itself to protect the source from a 2 ohm speaker.