The sample rate is 8kHz, which means the Nyquist frequency is 4kHz. Slowing it back down won't sound good, but frequencies below 400hz will be present.

Here's a 8kHz .wav slowed down to 1/10: http://dump.elektronaut.no/post/ak52_1x.wav

edit: You probably need a subwoofer or a decent pair of headphones to appreciate the rumble.

Awesome, this deep rumble is oddly soothing in my MDR-7506s.