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Speaker Cone
and Cabinet

The speaker cone and cabinet affect the signal in a non linear but time invariant way. This effect is purely dependent on the signal's volume. To estimate the effect, we took the impulse response through the amp at different volumes and use a lookup table to apply the effect based on the main volume. A comparison of the speaker cone's response at a low sound pressure level (SPL) vs a high SPL is shown in Figure 1.

lowestSPLOffCenter.jpeg
highestSPLOffCenter.jpeg

Figure 1. Speaker Cone IR Centered Mic.

We decided to generally just use the microphone that was centered on the speaker cone for all of our measurements for ease, but in this example we thought we would include a comparison plot of the measurements taken with a microphone centered on the cone vs. offset slightly as shown in Figure 2.

lowestSPLCenter.jpeg
highestSPLCenter.jpeg

Figure 2. Speaker Cone IR Off-centered Mic.

As you can see, there was not a very significant difference in the responses visibly so we continued on with using measurements taken from the centered placement in order to stay consistent throughout all of our analysis.

IMG_4437.HEIC
IMG_4434.HEIC

Figure 3. Bypassing Guitar Amp to Send Impulses Through Cones

We used the main volume to apply this to the signal. This is shown in the main demo file on the demo page of the website.

Video. With and Without Cone

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