QSC K.2 Series Service Manual page 37

Part 2: Measuring sensitivity (sound pressure level)
1. Set the output of function generator: 0.00 Vrms, 100 Hz, sine wave
2. Hold the SPL meter 1 meter in front of the loudspeaker, directly on axis with its centerline. Measure and take note of
the sound pressure.
3. Gradually adjust the generator amplitude and/or the amplifier module gain until the SPL in the table below meets or
exceeds the SPL dB numbers.
4. Compare your measurements with the data in the table below.
5. Change the generator frequency to 5 kHz and repeat the measurement.
Model 100 Hz SPL (dB)
K8.2 107 ± 3
K10.2 107 ± 3
K12.2 108 ± 3
Note: These figures apply only to on-axis measurements. If the SPL meter's microphone is not on-axis with respect to the
loudspeaker, the relative SPL measured at 5 kHz may be significantly lower.
Part 3: Measuring peak SPL
1. Set the output of function generator: 0.00 Vrms, dynamic pink noise
2. Hold the SPL meter 1 meter in front of the loudspeaker, directly on axis with its centerline. Measure and take note of
the sound pressure level.
3. Gradually adjust the generator amplitude and/or the amplifier module gain until the SPL in the table below meets the
SPL dB numbers.
4. Compare your measurements with the data in the table below.
Model Peak SPL (dB)
K8.2 128
K10.2 130
K12.2 132
Part 4: Frequency sweep
Turn up the signal generator or amplifier module gain until the SPL at 1 meter distance is suitably loud, about 100 to 105
dB.
Step or sweep the generator frequency from about 20 Hz up to about 20 kHz. Listen for a clean, undistorted tone; any
buzzes, rattles, distortion, etc., could indicate a defective transducer, loose hardware, damaged enclosure, or other problem
that must be corrected.
TD-001517-01
K.2 Series Service Manual
5 kHz SPL (dB)
104 ± 3
104 ± 3
104 ± 3
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