Audio Output
This 2-pole, 5 mm screw lock captive screw receptacle is used to connect the amplifier to
the left speaker. The amplifier produces up to 15 watts per channel.
OUTPUT
CLASS 2 WIRING
L SPEAKER
RCA
Captive
Screw
TRS
+
-
Left
+
+
Right
RCA
Captive
Screw
TRS
+
-
+
+
+
+
+
+
Amp Stage
Stereo
Stereo
Figure 55.
Amplifier Output Channels
Signal flow is as follows:
1.
The SB 33 A sums and weights the left unbalanced signals from the TRS and RCA
receptacles. This summed, unbalanced signal is then summed with the left balanced
signal from the captive screw receptacle.
2.
The right channel is handled in the same way.
3.
The left and right stereo channels are sent to the left and right output amplifers
respectively
The captive screw, RCA, and TRS inputs are buffered.
Internal Adjustments
This section describes how to set the level, bass, and treble potentiometers on the
SB 33 A (located on the panel inside the right speaker module).
LEVEL
BASS
TREBLE
Figure 56.
Level, Bass, and Treble Knobs (located inside right speaker module)
Setting Input Level
Adjust the amplifier input level as follows:
1.
Unplug the Remote plug from the unit.
2.
Set the volume of the audio source to its minimum level.
3.
Turn the Level potentiometer fully counterclockwise to its minimum setting.
4.
Set the volume of the audio source to its maximum level. No sound should come out.
5.
Slowly increase the amplifier level by rotating the Level potentiometer clockwise until
sound distortion starts. Lower the level slightly until the distortion disappears. At this
setting, whatever the volume setting of the audio source, no clipping should occur.
SB 33 A Series • Operation
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Содержание SB 33 A 82-90
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