I can't quite figure out if it's some sort of reverb on the low end or a reverse kick on it. It starts around 1:28

i'm also interested to know how its done

If you're doing it live, you can achieve something similar with the echo on the DJM800. But in a recording? hmmm... Beat Repeat? I'm sure there's a few ways to get that repeating pattern.

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the beat is a sample of busy child by the crystal method

Reverse kick like in hardstyle, less distortion and a low pass.

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