car audio vs home audio

[hoss 5,000+ posts]

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car audio and home audio are one in the same... it is all an electrically driven device used to reproduce sound... the actual components themselves may be designed around different goals, but in the end, they all do the same thing...

and to the minivan guy, now that im not in such a smart *** mood //content.invisioncic.com/y282845/emoticons/tongue.gif.6130eb82179565f6db8d26d6001dcd24.gif , ill explain a bit better.

the Fs is the resonant frequency of the driver. the drivers moving parts oscillate back and forth, which causes the moving pieces to resonate, not the basket. the only purpose of the basket is to hold the motor, and to keep the moving parts in place, nothing else. if we could mount the motor on the back of the box, there would be very little need for a basket at all //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif

 

[MiniVanMan 10+ year member]

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car audio and home audio are one in the same... it is all an electrically driven device used to reproduce sound... the actual components themselves may be designed around different goals, but in the end, they all do the same thing...

and to the minivan guy, now that im not in such a smart *** mood //content.invisioncic.com/y282845/emoticons/tongue.gif.6130eb82179565f6db8d26d6001dcd24.gif , ill explain a bit better.

the Fs is the resonant frequency of the driver. the drivers moving parts oscillate back and forth, which causes the moving pieces to resonate, not the basket. the only purpose of the basket is to hold the motor, and to keep the moving parts in place, nothing else. if we could mount the motor on the back of the box, there would be very little need for a basket at all //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif

Okay, I'll concede that it was a very basic explanation, but I was in quite a hurry.

However, are you saying that the basket has nothing to do with how the cone will transfer vibrations to the motor? Yeah, the basket is just one part of a whole system, and I'll take the hit for simplifying that, but to say that the basket has nothing to do with the Fs of your system is flat out wrong.

Take for example the car door. We mount a speaker on the metal baffle that the car provides, and we achieve a certain resonance. We dampen the baffle area, with a good sturdy MDF baffle, and we lower resonance a bit more. We add dampening material to the entire car door, and we dampen resonance, and lower the resonant frequency of the door even more. So, if the surface the driver's "basket" is mounted to has a huge affect on the resonance of the driver, how in the hell are you going to tell me the basket has no affect on resonant frequency.

Since the basket holds the motor in place, the diaphragm in place, and the cone in place, and Fs is figured using the values of Cms, and Mms, it stands to reason that the basket can have an effect on your Fs. ESPECIALLY in a car where vibration (which is the initial argument) can introduce a ton of external vibration into the system. Generally, in free air, when being tested, a basket has no effect on how the driver will resonate as it's just a function of the diaphragm's (cone's) compliance, and the mass of the drivers suspension. Yet when we put that driver into a system (mounted in an enclosure, with real world power applied), things change dramatically.

So, yeah, when calculating Fs, we only use the Cms, and Mms values. When calculating a "system's" resonant frequency we need to include a whole lot more. When calculating a system's resonant frequency it starts at the basket. Any vibrations in the system (to include enclosure, mounting, etc) are going to first be met at the mounting surface, and that is the BASKET.

Laugh again, go ahead.