trying to record myself
Richard, I haven't made it clear that I am the vocalist in question, not the instructor. (If I were the instructor, I could certainly do without a mic).
Why a recording ----- I can't hear my voice accurately in real time because the sound also travels inside the head. So a recording is necessary for correcting mistakes upon playback. When I practice in my room (i.e. without the instructor), I'd like to record my voice, listen to the playback, and try to improve the technique.
Why not 8 inches ----- Chessparov, I did try to sing to a mic only 8 inches away. But I found that I wasn't projecting the voice in the same way as I would project to the instructor five feet away (during training at his place). So the 8-inch recording wasn't of much help in the self-practice. That's why I thought of recording from a longer distance.
Why 5 feet --- Five feet is the distance from me to my instructor when I take lessons at his studio. I didn't realize that five feet would be too big a distance for recording. I've seen longer distances. I used to sing in a choir and we did some concerts in a hall. A mic was hanging there, about 10 - 15 feet from us. (I didn't get to listen to those recordings, though.) I figured if 15 feet worked in a hall, maybe 5 feet wouldn't be outrageous for my room.
How it failed ------- As I can't hear myself accurately, the only way to find out whether the recording works is to record someone else. So I recorded other singers at my place. I stood five feet away from them, with the mic next to me. As you can tell, the recorded voices didn't sound like their original voices I heard from the same distance.
Why a new mic ------- I attributed the failure above to the wrong choice of mics (AKG 3700 and AKG C1000S). So I've been on the lookout for a mic suitable for that distance.
Well, now I guess I simply can't compare my tiny, untreated, reverberant room to a 1500-seat purpose-built hall, let alone comparing a solo voice to a choir.
Now that your consensus is that recording from five feet away is a non-starter in a reverberant room, perhaps I should ditch that idea and accept the normal 8-inch distance --- until I can afford to build a studio.