With regard to the differences between a fife and a high flute, I agree with what has been said in that it depends on how the instrument is intended to be played. IMO, most high flutes are designed to play well in the first two octaves and begin to go out of tune in the third octave. For this reason high flutes and piccolos are great for playing regular folk tunes, such as ITRAD. On the other hand, fifes are designed to play best in the second and third octaves, as has already been stated. They are used for the marching military tunes of the fife repertoire
Comparing flutes and whistles is another matter. Here are some general comments that I wrote in my “Flute Buyer’s Guide”. The results of a volume level comparison test will follow in the next paragraph.
There is some misunderstanding about the difference between flutes and whistles. Whistles are a group of flute-like instruments where the sound is produced by blowing through a fixed fipple or blowhole. Examples of whistles are penny whistles, recorders, and Native American flutes. One advantage of whistles is that they are easy to play, in that a tone can be produced by merely blowing in the mouthpiece. A serious disadvantage of whistles is that it is difficult for the player to modify the quality of the tone produced, which is often an airy, thin tone. Of course, if the whistle maker is expert, the sound produced can be quite acceptable, but in my opinion, not as good as the flute tone (my personal bias). Flutes, on the other hand, are generally side-blown (transverse) instruments. With flutes there is no fixed fipple but only an opening where a column of air from the mouth is split, with part of the column of air diving down into the flute to set up a standing wave that produces the tone. The quality of the tone is controlled by the shape and angle of the blowhole and by the embouchure, the position of the player’s mouth and lips. Once this simple technique is mastered, flutes are capable of producing a wide range of nuances and subtleties of tone that are impossible with a whistle. The transverse flute allows the performer a greater potential in terms of sound dynamics and expressiveness.
Here are the results of a sound level test that I did today. I used a tripod-mounted digital sound meter set at max-hold and playing at a distance of 10 feet. For each note I played the loudest note that I was able to play. The readings are in decibels. The first instrument is a one-piece, pvc high D flute. The second reading is from a Clark Sweetone high D whistle. The third reading is from a Shaw, Freeman-tweaked high D whistle.
D5 (77.6, 75.0, 73.7), F5# (85.8, 77.8, 78.0), G5 (92.2, 75.1, 78.3), A5 (90.7, 81.0, 79.1);
D6 (94.3, 86.1, 87.0), F6# (95.4, 90.8, 89.0), A6 (95.1, 86.9, 89.3), D7 (100.1, 93.4, 96.0)
It is not difficult to see that the high flute is capable of producing a louder tone than either of the two tin whistles that were tested. However, just because the high flute can play loudly doesn’t mean that you have to blow it that way. They are also capable of being played softly, as well. If you are looking for a flute the will cut through the din of a loud session, a high flute is a good choice.