[kato]

If you're hearing the ambiance of the room in your recordings (the reflections from the corners,) then some treatment is in order.

Even just a room with carpet, padded couches and other furniture goes a long way compared to an empty room with hard wood floors. You could even put a mattress up the wall and sing toward it and you'll hear that it helps.

In an extreme case, a friend of mine recorded vocals by putting a sleeping bag over his head with the mic inside the sleeping bag. It actually helped a lot because he was in a highly reflective basement.