Expensive but extremely effective. A Coupel ORTF perfect, although I repproche that direction can not vary, which automatically condemns them in ORTF utiliosation, where the record is stunning in any case. The capsules are interchangeable, but they are connected in series with the MK4 (hence the appellation MSTC 6-4), used with 12 or 48V. Very easy to set up (XLR stereo), but it is best to use with their suspension (optional unfortunately), because of their high sensitivity. Apart from the fact that it is necessarily ORTF (no possibility to change their angle slightly), and the suspension is not included in the set, this couple is perfect, very garian potential (but high price too).