I doubt Sheng Ya is Vincent OEM, because Sheng Ya claims "V icent" is its oversea brand. Please note Sheng Ya says "V icent" without the "n" for "Vincent". I think Sheng Ya may want customers "V icent" is same as "Vincent" without trademark infringment. I have a Sheng Ya catalogue on my hand. It also uses "V icent" instead of "Vincent". As to my knowledge, Vincent has longer history than Sheng Ya. Sheng Ya might copy Vincent's design and gives customer feel Vincent is from Sheng Ya, which is very popluar way in China. If this is true, I think Sheng Ya is just cheap duplicates. Most Chinease audio products makers either use similar brand or copy exterior design to give customers they are in same league as those high end products.