Spark Speaker Mod
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I designed and 3D printed some speaker mounts for the Spark that angle the speakers out similar to the Spark Mini. Sound is subjective, but to my ears this was a big improvement.
I also made a plug that reduces the size of the bass port by 50%. This was a little harder to notice, but I think it was a slight improvement.
The only downside is that the stock grill will no longer fit. So, next step is a custom grill.