Listen SC Amp, User Manual

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16
SC Amp
TM
Manual
Operation
Use with DC Connect
Voice Coil Offset (DC Offset)
SC Amp can be used with external voltage sources in order to apply an offset to the stimulus sent to a
speaker under test.
The example in Figure 7-6 shows SoundCheck controlling Listen’s DC Connect in order to supply a DC
Offset voltage to SC Amp.
z
The SoundCheck system is connected via USB to DC Connect
z
DC Connect output is connected to the DC Offset input of SC Amp
z
The SoundCheck sound card Output 1 is connected to the Line In of SC Amp
z
A DC Connect Stimulus Step in a test sequence controls DC Connect to send a 1 VDC signal to SC
Amp
z
The sine sweep stimulus from the SoundCheck sequence has a positive offset of 1 V applied to it
as show in
Figure 7-6.
Note:
Use with other offset sources is similar. Any voltage supply can be used to
apply up to ±3.5 VDC or Low frequency AC (<5 Hz).
0 V
1 V
Positive Offset
DC Connect Stimulus Step in SoundCheck sequence set to control
DC Connect via USB. DC Connect output voltage set to 1 VDC.
Stimulus to speaker is positive, offset by 1 V
Figure 7-6: DC Offset Example
Audio
Output 1
DC Voltage
Output
Computer Running SoundCheck ®