Hmmm, got this from Stage 93:
"The Trios are the most affordable customs we have, and is my personal favourite. I would say that the mids shine and the overall soundstage is fantastic with only 3 drivers. We developed this for the longest time, and I would highly recommend the Trios if you need a day-to-day use IEM. They are also being used by New Creation Church.
The 93Quads have been said to sound like the UE11 - and are extremely popular in Japan. These are bassier than the Trios. These suit J-Rock style of music, and also more mainstream music. Depending on your cable, it can be tweaked to suit whatever you prefer, a warmer sound signature or a bassier combination.
The Stage 6 is our flagship IEM, and also what the editor at BARKS Japan call his favourite 6-driver CIEM, beating out other vendors with 6 drivers. The Stage6 was created with precision, and it sounds very neutral. The cable you use with it makes its sound signature. Seriously. It depends on your set up, and this CIEM would be the perfect versatile IEM. "