Ver 1.0 Sep 2011 6
advantages is that the sound pressure level does not fall as fast
with respect to distance as it does for a point source.
Because a line source radiates sound in a cylinder and a point
source radiates sound in a cone, with a doubling of distance from
the loudspeaker, a line source attenuates by 3dB whereas a point
source attenuates by 6dB. Since the midrange and tweeters are a
line source, and the bass is a point source, when the distance
doubles, you have to increase the bass volume by 3dB.
The G2jr is designed for a listening distance of approximately 12
feet (3.65m) and the BASS GAIN when set at level 3 (9 o’clock
position). If the listening position is closer than 12 feet, the BASS
GAIN should be reduced and if the listening position is greater than
12 feet, the BASS GAIN should be increased. (The minimum listening
distance should really be about 11 feet.) Since there could also be
room gain in the bass, this is not a simple linear relationship.
Otherwise, we could put a distance scale on the BASS GAIN control.
Once this relationship between BASS GAIN, listening position and
the room is understood, setting the correct bass level should be
relatively straightforward.
Start with a single vocal (not a soprano) with simple instrumental
accompaniment because the sound of the human voice is more
easily recognizable than many instruments and is the least
complex sound to deal with.
Leave the LOW PASS control alone for the moment, as it should
remain set at 92Hz (12 o’clock position). This control will be
addressed later. Turn the BASS GAIN up or down until the voice
sounds correct. Whatever controls you use, turn them up and down
only a little at a time. It is easy to turn it up or down too much.
Concentrate on the mid bass regions (as opposed to the very low
bass in your recording) to achieve a natural blend. The voice and
the music accompaniment should sound as if it were cut from one
cloth, not separate.
If the voice sounds “thin” or does not have enough “chest” to its
sound, turn the BASS GAIN up till it does. If you find that turning the
gain up creates too much low bass, then it is time to decrease the
LOW PASS. The BASS GAIN only changes the bass by -3dB/+12dB.
