Comment by Applejinx

Sure is for bass. It's a sealed box that you're in, with shapes that stop anything from acting like a simple room shape, and surfaces that can soak up highs, and so small that this absorption is a huge percentage of surface area.

There's a reason mix engineers have always done 'check the mix in a car'. It might be way more revealing of what's happening in the bass, even when the speakers are relatively weak. Once you get anything decent, watch out. It's a bit like having your whole body inside headphones.