I've noticed a quality that sometimes bothers me about my DPA 4060's. I love the mics and the recordings I've done with them, yet sometimes I notice a bit of brightness or granularity or something. That can work to my advantage at times but isn't nearly as smooth sounding as the bigger more costly DPA mics. Like most people here, I'm using the 4060's with the short grids. I've listened with the long grids briefly and that quality seems more exaggerated with the larger, peakier frequency bump the long grids produce. I imagine the quality I'm talking about may be related to or at least accentuated by the bump in frequency response either grid produces around 10khz. Although I haven't recorded any actual music without grids (or with the long grids), I've listened without the them and the high frequencies seem overly rolled off to my ears.
What I should do is switch between short grids, long grids and no grids for a recording of some non-important music and compare (not just record my stereo). I will do that when the opportunity arises, but I figured I'd post here for discussion as well and what I'm thinking about is more to do with the principles behind the different length grid tubes rather than an opinion as to weather to use one or the other (or none).
If I find the high end lacking without the grids (which I suspect will be the case), I wonder about making a shorter version of the stock short grids. Maybe just removing the grill portion of the grid and leaving the tube extension will make a difference, or perhaps then trimming the extension tube shorter will reduce or modify the bump without sacrificing too much top end.
I'm interested in other's experiences with these mics concerning use of the grids (or no grids) and also interested in the thoughts of those here who know much more about the mic engineering/ & acoustics issues that are involved here. I imagine the grids create the frequency bump by means of a resonant frequency produced by the length of tube and I suspect that resonant reinforcement may introduce some minor phase issues or resonant weirdness that I'm hearing. Even with the grids removed, the capsule is still half buried in the tube portion of the mic body. I'm not planning to start grinding away at the mics themselves, but Guysonic modified some 10 years back to trim back that tube section of the body among other mods and reports great results, though too difficult and painstaking and costly to be a viable product for him.
I love these little mics, just wonder about making them even better sounding & versatile, Ideas?