well i have my 4099 and ill post my opinions. overall, i think its a great mic and sounds awesome and i can get very loud with it with no feedback problems and im sitting 4 feet from my amp. one thing that blew me away with this mic, and im sure its true with all mics actually, is how totally different it can sound based on where on the bass you're micing. on one bass you can go from a really nice sound to a terrible and totally unuseable sound. im stating this for a reason. over all i love it, but i feel that i must comment on what i feel are shortcomings and hopefully someday dpa can take these into account. first, as i mentioned, the position of the mic is of utmost importance. the bass is a very large instrument, and this mic isnt made or markedted towards bass players per se. i really think that it needs a longer gooseneck and a better mounting clip. you just need to do so much experimentation with location in order to get the best sound, and the neck just isnt long enough to explore all your options on a double bass. also, regardless what the manufacturer says, and even though there is a shock mount, you do get handling noise and vibrations being picked up by the mic. to compensate for this a high pass filter is essential. i dont have the xlr clip with the high pass built in, but im using an external one with good results. i can turn it on and off and i can get much more useable volume before feedback with the filter on. also, in order to try to cut down on some of the vibrations being picked up im using the foam as pictured below. it does a decent job, but there still needs to be imrpovement in this area. also in those pics note the location of the mic. on my bass thats the sweet spot. not sure if this will be common on most basses, but i tried it aimed closer to the bridge foot and there was just too much action in the top at that location. the top of the bass actually vibrates at a pitch and the mic picks it up. where the mic is in the pics is toward the bottom of the bass bar. on this bass i can get a really loud and full sound and no feedback problems at all. none of the locations i tried on the treble side worked as well as this location for me.
it might look funny, but i think for the bass the gooseneck needs to be 10-12 inches to get maximum flexibility and variation.