Auxiliary Outputs’ Program Limiter Lookup Table
Note that the setting of the amplifier outputs’ limiters does not beed referenced to the
amplifier’s gain as this is predetermined for the internal power amplifier sections. A
separate lookup table and explanation is given on the previous page.
Consider the table below.
dB Ratio Vrms
Pwr 8 Pwr 4 Pwr 2
45 177.83 137.74 2371.71 4743.42 9486.83
44 158.49 122.77 1883.91 3767.83 7535.66
43 141.25 109.41 1496.45 2992.89 5985.79
42 125.89 97.52 1188.67 2377.34 4754.68
41 112.20 86.91 944.19 1888.39 3776.78
40 100.00 77.46 750.00 1500.00 3000.00
39 89.13 69.04 595.75 1191.49 2382.98
38 79.43 61.53 473.22 946.44 1892.87
37 70.79 54.84 375.89 751.78 1503.56
36 63.10 48.87 298.58 597.16 1194.32
35 56.23 43.56 237.17 474.34 948.68
34 50.12 38.82 188.39 376.78 753.57
33 44.67 34.60 149.64 299.29 598.58
32 39.81 30.84 118.87 237.73 475.47
31 35.48 27.48 94.42 188.84 377.68
30 31.62 24.49 75.00 150.00 300.00
Using this table it is a straightforward procedure to work out the required setting of the
limiter thresholds for the system.
First, check the RMS power rating of the speaker system, and its impedance.
Look up this value in the table above, using the closest value below the rated power of the
speaker system. Note the corresponding ‘dB’ value.
Check the gain of your amplifier, which needs to be in ‘dB’.
Subtract this gain figure FROM that obtained from the table to find the required absolute
setting for the limiter thresholds.
Note that, for safety, always set the limiter threshold 1 or 2 dB below the maximum allowable
worked out using the above method.
As an example, for a subwoofer rated at 2000W and 4R, working with an amplifier which has
32dB of gain, the limiter threshold would be calculated as follows:
“First, check the RMS power rating of the speaker system, and its impedance.” 2000W, 4R
“Look up this value in the table above, using the closest value below the rated power of the
speaker system. Note the corresponding ‘dB’ value.” 41dB
“Check the gain of your amplifier, which needs to be in ‘dB’.” 32dB
“Subtract this gain figure FROM that obtained from the table to find the required absolute
setting for the limiter thresholds.” 41 — 32 = +9dB
“Note that, for safety, always set the limiter threshold 1 or 2 dB below the maximum
allowable worked out using the above method.” with safety, +8dB
To Next Page
Loading...
Need help?
General
