Dear Concern,It is nice to write to you. This is Geoffrey from Kenya. I am interested in this style of active subwoofer loudspeaker powerful subwoofer and in doing business with you.May I know more information about product such as:Warranty,Voltage,Certification,Do you have any quality assurance certificates?Hope you reply to all my questions so I could proceed with buying.Thank you for your timeGeoffreyRugiff Studios Show More