I'm sorry, BC, but I think you have the wrong image in your head of how these things all actually work and fit together. I'm sorry to say that the above statement is wrong in several different ways. I'm not just piling on on a gang tackle, nor meaning to pick on you here; I just want to try and correct some misunderstanding you apparenly have about how these things actually work. This isn't a matter of opinion where all opinions are of equal value. This is a case where you are basing your opinions on facts that you are plain and simply misunderstanding or getting wrong. The answer to 2+2 is not a matter of Internet opinion, and neither is the answer to how microphones, mic pads and sounds actually operate.
There is little to no difference in "range" between a typical cardioid and a typical onmidirectional. In fact, there actually is no "range" per se. Any microphone could pick up a sound from 5 miles away if that sound were loud enough. I think you're probably referring to "sensitivity"; but even there the difference between cardioid and omni is not a difference in general sensitivity but a difference in sensitivity based upon the direction from the sound source. Cardioids are not used to reject sounds "in the background", they are used to reject sounds that are well off-axis forn the direction in which the mic is pointing (e.g. to the sides or rear.)
What's the difference? If you have a sound that's "in the background" but still relatively on-axis, the cardioid is still going to pick it up just as well as the omni will. In fact, depending on the cardioid design and it's sensitivity pattern, in the general direction to which the mic is pointing the cardioids are often even more sensitive (in the incorrect verbage, they have even more "range") than comaprable onmis are.
Next, the fact is that if this guy is using a standard issue kick mic like a beta52, d112, or e602. it already is a cardioid or a supercardioid mic. Yet they're still getting the snare bleed because
the drummer is playing the snare oo loudly relative to the way he is playing the kick. By the time the signal reaches the pad, the cardioid has already done it's job, but that job wasn't good enough because the snare bleed is still too strong relative to the kick. Padding it at that point isn't going to have any more or better effect than if it were an omni mic feeding it that same signal.
And like Farview and I and others have said many times already - but you just haven't gotten a handle on it yet I guess - the pad is going to reduce *everything*. It's not going to change the fact that the snare is too loud relative to the kick; a 20dB pad is going to knock them both down by an equal 20dB. But the relative difference in volume between the two is not going to change; the snare is *still* going to be too loud relative to the kick. the only difference is now the kick will not be loud enough to work with.
Keep going to class, BC. You have learned some stuff so far, but only enough to make your current knowledge level dangerous. You still have quite a bit of learning to do. In due time, you'll look back on this thread and wonder, "Man was I off course there or what?", and you'll smile and be glad to know that you got past it and turned that danger level of knowledge into an expert level.
G.