![]() The car under test is a BMW 5 series F10 sedan. Introductionīefore we get to the good stuff, let’s get more familiar with what we are measuring in our example. As you will see, the car resonance will appear as a large spike in response, so it’s very easy to spot, even without the nearfield response as comparison. The frequency which get’s the largest amount of net gain should be the resonant frequency of your car. After the nearfield response has been scaled accordingly, we can compare it to the response of subwoofer + car gain. Then, we place the microphone in front of the dash and take another measurement. This is to have an anechoic response of the subwoofer as reference. Secondly, we will connect the sealed subwoofer to the amplifier and make a nearfield measurement. The microphone connected to the audio interface, the interface to the laptop and the subwoofer amplifier to the audio interface. Let’s explain the theory on how we are going to go about our business. This means that you have an amplifier that is up and running, you just have to connect the subwoofer. This is all the gear that you need, considering that you already have a subwoofer setup in your car. Audio interface (I used Focusrite Scarlett 2i2).Measuring microphone (I used Dayton Audio EMM-6).Sealed subwoofer with very linear response ( here is how I made mine).Some you might have laying around, and some are quite specific to audio measurements, but are not that expensive. You will need a few items to find out the resonant frequency of your car. For a sound quality setup, it’s good to know it, so you can compensate for it. Most of the times, it’s a bad thing, as it can boost a certain range of frequencies too much, and the sound will suffer in terms of linearity. Outside these types of competitions, knowing the resonant frequency of your car isn’t particularly useful. The car and speaker-port combo will start to resonate at the same time, and will create a large boost in sound pressure. If you know the frequency where your vehicle resonates, you can tune your enclosure accordingly to get “free dBs”. Knowing the resonant frequency of your car is particularly useful in SPL and dB Drag competitions. Vehicle resonant frequency – How to find it ?
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