As those Beyerdynamic cardioids have not been around for long and users here aren't familiar with them, we don't really know yet how low the bass response of the microphones goes with a relatively flat response before beginning to roll off. All cardioids roll-off at some point, only pressure-omnis are flat down to the very lowest frequencies, so these new Beyer cardioids will definitely pickup less really-low bass than your omnis, and are likely to also pickup less of the very bottom of the music you are recording, which is typically somewhat higher in frequency than that really-low extended omni response. The bottom of that actual bass response of the music in the venue is higher in frequency than the start of the effective roll off of some cardioids- typically higher-cost phantom-powered mics- but lower than the inherent roll-off of many miniature cardioids. You'll need to make some test recordings to determine if the inherent cardioid bass roll off of the Beyers is sufficient on it's own to bring the lows into proper balance when recording in a situation with "too much bass". If it is then great, you don't need to correct the bass response further.
If there is still too much bass, you can either record at a low enough level to not overload while recording, then adjust the bass afterwards using EQ on the computer, raising the overall level of the music after doing that to something reasonable. That's the most accurate and best sounding way to do it, and why Acidjack and myself recommend doing it that way. The other option is to use the bass rolloff on the preamp to do something similar. That's less ideal because you have no control over the shape and placement of the bass reduction EQ curve, but doing it that way may eliminate the need to do the EQ manipulation later on the computer. Depends on how particular you are about getting the music sounding it's best verses the effort involved. If minimal effort without making EQ adjustments later is more important to you, hopefully one of the variable bass roll-off options on the preamp will be acceptable enough. If going that route, make test recordings with the bass roll-off switch on the preamp in each position, starting with no roll-off at all, and choose the one which sounds best. That should be the roll-off switch position which reduces the low bass just enough- any more will begin to sound thin, weak and powerless- not very appropriate to the musical style.
Keep in mind that "boominess" is often higher in frequency than the very lowest musical parts, so bass roll-off is not a very good tool for dealing with that in a full stereo mix or audience recording. A very high bass roll-off will cut the boominess, but also all the bass and kick below that range. That's why EQ is preferable to a low-cut filter (bass roll-off is a low-cut filter). We can dial in an EQ curve which reduces a problematic "boom" region more than the bass below that region, yet still reduces all the bass range somewhat compared to the frequencies above that, instead of hacking off everything off completely below a certain frequency range.
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