This first tip might be the most obvious, but it still bears repeating: find the best sounding room in your house and record there. But what do I mean by best? And how do you go about finding it?
Best doesn’t mean “dead,” though at home, dead usually helps. Still, you will not often find a room that is dead in and of itself. So look for ambiance that suits the need of the recording instead, because ultimately, you’re never going to pad a room in your house to the deadest possible point—not unless you seek help from an acoustician, or are one yourself. You might as well find a room whose characteristics are pleasant and work from there.
What do I mean by pleasant? I mean, as free from odious properties as possible—a room without flutter echoes, frequency buildups, and other drawbacks.
To do this, I recommend you go around your house, walk around the various rooms therein, and do the following: first, clap your hands, listening for flutter reflections. You don’t want these; they sound sort of like a spring boinging from far away, and they have an insidious way of affecting all the audio they’re mixed with.
Having identified the spot with the least possible flutter, use your voice as your next measuring stick. Say the word “haaaa!” shortly, from your chest, and with a bit of gravitas; hear how the room reacts to your voice. Walk about each room and note positions that sound the best. Take the top three contenders, and set up your recording device—say a Spire, for instance—in those very positions within those very same rooms. Now, record yourself clapping your hands once, and saying “haaaa!” again.
When you listen back to the recordings, note the fullness of the sound as it is captured, and the reflection of the room shortly thereafter. You want the fullest sound with the least noticeable amount of audible room reflections. You might have to make some compromises however. For instance, if your favorite room has a window that overlooks a noisy traffic circle, you might consider choosing your second favorite room.