22
RMS power
RMS power
100W
100W
250W
250W
500W
500W
750W
750W
1000W
1000W
1250W
1250W
1500W
1500W
1750W
1750W
2000W
2000W
2500W
2500W
3000W
3000W
Nominal Impedance (ohm)
Nominal Impedance (ohm)
8
4
4
4
4
4
4
4
4
4
4
4
8
8
8
8
8
8
8
8
8
8
Amp Gain (dB)
Amp Gain (dB)
32
32
32
32
32
32
32
32
32
32
32
32
32
32
32
32
32
32
32
32
32
32
Threshold (dBu)
Threshold (dBu)
-0.75
-3.76
3.23
0.23
6.23
3.23
8
5
9.22
6.22
10.2
7.2
11
8
11.67
8.67
12.25
9.25
13.22
10.22
14
11
Vrms to the load (Volts)
Vrms to the load (Volts)
28.28
20
44.72
31.62
63.24
44.72
77.46
54.77
89.44
63.24
100
70.71
109.54
77.46
118.32
83.66
126.5
89.44
141.42
100
154.92
109.54
Threshold values for 4ohm system´s impedance:
E11EVEN SOUND \ IO-48 \ User’s Manual
LIMITERS
The limiters built into the iO-48 processor are intended to be used for loudspeaker driver protection, as opposed to
amplifier protection.
The following section describes how to set up the unit´s limiters to provide exceptional protection against driver
overheating and cone over-excursion. Most speaker systems are given a power rating in Watts RMS. This is the
maximum continuous power that the system will handle and often appears very conservative. In reality, as music
program is far from continuous in nature, the peak power of the system is much higher – up to ten times the
continuous figure. Any limiter, which is to protect the driver from damage, must be able to fulfil the following
tasks.
• Have an attack time which is calculated to allow transients through but keep the RMS level below the speaker
manufacturers specification;
• Have a release time which is sufficiently long to avoid the limiter itself modulating the program;
• Be intelligent enough to adjust the envelope of the limiter according to the frequency content of the program
material.
The program limiters are capable of performing all these tasks. The only parameter that the user must set
manually is the threshold, and it is crucial that this is done correctly.
Consider the table below. At 8 ohm impedance these are the threshold values that correspond to the RMS power
in the first column (amplifier gain = 32dB):
Содержание E11EVEN 11SOUND
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