User's Manual

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? en 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.