We are Guangzhou Huiying Electronics Products Co., Ltd, which is a professional manufacturer of all type of professional sound: e.g. professional speaker(passive and active), active monitors, amplifier, mixing console, active crossover, Karaoke amplifier and speaker, woofers and HF drivers, public address amplifiers and speaker, Microphone, peripherals, cable and so on. We provide OEM/ODM service. For further information, please browse our website: www.yt-hy.com . As soon as I get your reply, I will send you more detailed informaiton and best quotation.