A solid microphone cables is an item that many may take for granted, but without them, your practice, recording session or live show could be in serious jeopardy. With a set of microphone cables close at hand, you will be heard loud and clear at any event. When choosing a microphone cable, you should definitely ask yourself “How many cables do I need?" If you are part of a group of singers, your best bet may be to buy a pack of cables. Musician's Gear, for example, offers their Lo-Z Mic Cable 20' in packs of two, four and ten, meaning you should always have enough to be prepared. If, on the other hand, you just need the one cable, they also sell them individually. At twenty feet long, these cables offer plenty of flexibility for moving around while performing. If you are looking for a more complete stage setup, you will want to check out one of the cable/stand combinations that are available to you. These packages are perfect for choirs and vocal groups both large and small, making them a must have for any performance or practice. If you want to stand out and make a bit of a statement with your microphone cable, one of the Musician's Gear Tweed Lo-Z Woven Mic Cables is almost certain to catch your eye. Stylish tweed designs give them a great look, while their copper shielding minimizes the electric hum, so they will still sound every bit as good as you'd expect. When it comes down to it, your microphone is only going to be as good as your microphone cable. Whether you're looking to pick up a new or extra cable for yourself, or a bundle for you and the rest of your group, you are sure to find these cables will be a great addition to your music room.
Not too difficult
You need a mic (could be lavalier or wireless -- about $100)
a microphone pre-amplifier
a headphone amplifier (4 to 8 outputs)
and long cables to plug the listeners' headphones into the headphone amp.
i cannot think of a way to get wireless connectivity to multiple sets of listener headphones-- i imagine that the radio-frequency wireless headphones from radio shack will conflict, but have no experience with them.