Manual-6
DRIVER PROTECTION FINE TUNING
1. Determine the driver’s maximum continuous average power rating in watts (W) (specified by the manufacturer).
2. Determine the driver impedance “z” in ohms (specified by the manufacturer).
3. Using the data in steps (1) and (2) above, calculate the maximum signal level in dBu that the driver can handle.
Max dBu = 20*log(
√
(w*z)/.775)
.
4. Determine the gain of the amplifier in dB (if the amplifier has a level control , you may wish to measure the gain). If, i.e., you put
1V in, how many volts come out? Then convert to dB (20 log gain).
5. Subtract the gain of the amplifier in dB from the answer in step (3) to obtain the correct COMPRESSOR THRESHOLD.
6. Set the RATIO to 10:1.
NOTES
Any change in amplifier sensitivity setting will effect the power limit to the driver.
If the DC 22S is placed just before the amplifier, no other system levels will effect the power limit setting.
EXAMPLE
1. Driver power rating: w = 100 watts.
2. Driver impedance: z = 4 ohms.
3. 20*log(√(w*z)/.775) = 28.2 dBu.
4. Amplifier gain is 30 dB ( 1V in equals 31.6 V out).
5. Set the COMPRESSOR THRESHOLD control to 28.2 dBu-30 dB = -1.8 dBu.
6. Set the RATIO control to 10:1.
All features & specifications subject to change without notice.
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