I cycle my shirts in the wash at 50 hz, but I can sometimes go all the way down to 45 hz. You can really 'feel' it's tactile feedback, especially if the clothes have been burned in the dryer, or have gotten lopsided in the machine, and have become less linear. Tossing a couple blackgates into the mix really spices things up, with a rhythmic tambourine-like accompaniment.