Recently i got 2.1 Bluetooth system, but it has uk plug 250v ,(220-240v 50/60 Hzh). I found those info's on plug and subwoofer. Since i dont know anything about those things, and i live in Europe i used UK to EU plug. My speakers are kinda working but the audio is very low on every option (Fm , USB, Bluetooth,Aux ) . Does anynody know what could be the cause ?