Please read my review on the Soundbar 700 for more details, but heres a copy/paste of what I said about this AMAZING sub-woofer:About the sound module. I bought my 1st pair ever in the Crocks store. sys will not drive this at all so dont waste your time trying. 5 plus wheels. Aside from wiping the item off there was no quality assurance testing. I guess these are only good for walking for a short time not for a long time. The foot is lifting up from the sole. I by no means have fat feet but I usually run between a 6. The last thing paired is always what the earphones would want to try to pair with. Mainly my right ear but that might just be me.