Thanks for the input. The two mic approach is now very common. Particularly in the 'metal' domain. I tried the set-up last week. Certainly don't invert the phase, that sucks a hole in the sound as I suspected it would. I chatted with the foh guy for Sepultura at their gig on Thursday (I was foh for two of the support acts). He uses two mics, 91/52. I don't like too much bottom end in the kick as you lose the snap you need for the 'metal' kick drum sound, particularly when the drummer is double kicking at high rates. Too much low end just ramps up and you get a wallowy sound. You need to hear the tapping from the beater. He blends the two sounds, raising the level of the 52 for the slower parts to emphasise the power and tone, and dropping it out a bit when the drummer goes into the rapid double kick mode. As you have all rightly pointed out, it is horses for courses. It won't work for all drummers/drums/styles. The 91 is handy for drums with front skins tho, as you can stick it round the front under the snare and pick up the beater sound. I have been very impressed with the mic in the two times I have used it in anger.....now I have to look at a new dynamic, tho I am leaning towards the 52.....tho....mmm D6....M88.....602!!!