The determination of sound equipment (I include mics, preamps, speakers, and electronic instruments) is very much an art. Here are a few tips:
1) Preamp + Mic is a big decision. There are lots of great preamps and lots of great mics, but the combination of the two is also a large part of the sound quality. I recommend using a tube mic and a solid state preamp, or a condenser mic and a tube preamp. I have a Rode NTX tube mic and a Trident S40 preamp, and the sound quality is exceptional for voice. For instruments, you can get away with a small condenser mic.
2) You will want a keyboard controller with weighted keys. If you are serious about being a studio musician, you will eventually teach (or already know) quite a bit when it comes to the keys. You will outgrow a simple non-touch sensitive keyboard quickly. Avoid controllers with flat, “diving board” keys. It should at least look like a piano.
3) Don’t skimp on cables. Go heavy duty, monster for the important stuff, such as the mic to the preamp. There is a difference, believe me.
4) Studio monitors: Some people couldn’t give a crap, but it helps if you have good acoustics in your room to take advantage and buy some good speakers. It is important to have the speakers standing by themselves, with nothing above or to the sides of them…this changes the sound. The point of having studio speakers is to get a true sense of the balance of the mix, not get it to sound like the radio. Remember, stereos pump up the treble and bass substantially. It just needs to be balanced in the studio, i.e. nothing should overshadow anything else. Keeping the monitors standing by themselves keeps the sound integrity in tact.
More on this later.
Studio construction:
You don’t have to create a room that is perfectly soundproof, or reverb-free. A little natural reverb is fine. The biggest thing you want to minimize is quick changes to the background noise. If you are on a busy street, for example…a passing car will screw with your mix. However, if you have a computer in your room, and it has a constant buzzing sound, you can usually remove most of that background noise with a noise gate or some other filters.
It bothered me, however…just personal taste. I wanted the room as quiet as posisble. I bought a USB extension, and a very long firewire, and moved my computer to the adjacent room. The video monitor, keyboard and mouse are in the studio with the mics, but the computer is outside. It makes a little difference, but most importantly I feel better about it.
Another point: soundproofing foam is not soundproof…it is reverb canceling. Noise passes through it no problem…but on the walls of a studio is deadens the echo. Don’t buy a ton of this stuff…placing it in the corners of a studio, and a little bit around where the monitors are is usually enough. Like I said, a little natural reverb is fine. If the place echoes like a cave, however, invest in some foam.
Usually, the best soundproofing comes from thick walls and, if you have access, soundproofing board (you can get this at Home Depot…it is like a light, soft plywood, and it actually does work pretty well if nailed to doors or over windows.