no i dont im not sure how to find out either , you can always try and contact mb quart here in the states, these were made in germany and hard to find. These were made back when they were still Mb Quart and all the Q series R series now the are something like PVR
They look real similar to the crossovers in my MB Quart 335.03's ...if they are the same they are Bi-Ampable as well...my set has the 8's 5.25's and tweeters