Nikon D300 User Manual page 609

Dealing with Sound on D-Movies
Sound recording on the D300S is accomplished either with
the monaural sound pickup mic on the front of the camera or
with an optional stereo mic that will plug into the camera's
stereo sound port.
The built-in mono mic looks like three tiny holes in a straight
line just below the D300S logo (see Figure 8-9, image 1). Be
careful about accidentally covering the microphone with a
finger, or you will have very muted sound. Also, be careful
about letting wind blow directly on the mic when recording
since that might cause a rushing noise that interferes with the
sound you are trying to record.
Figure 8-9. Mono sound recording mic and speaker
The video's sound is output during playback through a small
speaker on the bottom rear of the camera, right below where
you place your thumb when holding the camera (see
Figure 8-9, image 2). You'll see nine small holes in a circle.
This little speaker can put out an amazing amount of volume.
In Figure 8-10, you can see the stereo mic port under the
Connector cover (rubber flap) on the side. The D300S offers
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