(1) the maximum power capacity and maximum voltage capacity calculation of

A formula: maximum voltage capacity V=√ maximum power load impedance W× Ω

Formula Two: the maximum power W= maximum capacity load impedance voltage V2× Ω

If a known speaker of the maximum continuous power (AES/ANSI) and indicate the load impedance, can calculate the maximum voltage to the speaker, such as the maximum power is 600WRMS A (ES/ANSI), the impedance is 8Ω the maximum output voltage, hope that through the system pressure limiter or speaker controller set value amplifier A, for the protection of the speaker, the data set into a related formula:

The maximum voltage capacity of V=√ 600W× 8Ω

4800

=69.28V

The resulting 69.28V voltage in 8Ω load impedance, power can produce a maximum of 600WRMS, so we should value cannot exceed 69.28V at the maximum output voltage limiter or speaker controller set power amplifier, can effectively protect the A speaker without getting burned.

(2) power amplifier voltage gain calculation of

Formula Three: voltage gain = output voltage V/ input voltage V

Decided by the relationship between the gain of the audio circuit input and output gain, expressed as multiples (× dB), or represented by the unit, if we want to know a gain of the amplifier (called voltage gain), you must know the input signal level and the corresponding output signal level. For example, known from the system before the signal level is input to the A amplifier is 0.775V, the output signal is 31V, the set of relevant data into equation three that the voltage gain amplifier:

The voltage gain of the output voltage of input voltage V/ = V

=31V/0.775V

(Times)

Also known as the signal level from the system level input to the B amplifier is 0.5V, the output signal is 20V, the voltage gain data set of related in equation three can also be learned:

The voltage gain of the output voltage of input voltage V/ = V

=20V/0.5V

(Times)

Note that the above two cases can be seen, A, B amplifier voltage gain is the same as the 40× two, so the voltage gain size and the size of the input signal.

(3) input sensitivity and voltage gain

Formula four: input sensitivity V= maximum voltage capacity V/ voltage gain of

On the contrary, the power amplifier can not generate power. The amplifier input signal level amplifying a multiple output level, the size of the output is determined by the magnification, the standard argument should be: the output voltage amplifier drives the load impedance of the speaker and thus turn into acoustic power. Professional audio。 The maximum input voltage of a power amplifier can accept is also called the input sensitivity, if the input voltage exceeds the maximum input voltage, the output capacity of the power amplifier will exceed the maximum range, and has a greater frequency response distortion. So if the maximum voltage is divided by the voltage gain, the maximum input voltage (input sensitivity) can be obtained. For example, A power amplifier is connected with the A speakers, the following two parameters:

A power amplifier: FTC power 550W@8Ω voltage gain 40 times; A Speaker: 600WRMS (AES/ANSI), impedance 8Ω (speaker power amplifier 50W.

The maximum voltage capacity calculation steps calculation

A amplifier maximum voltage capacity of V=√ 550W× 8Ω

4400

A power amplifier input sensitivity V= maximum voltage the voltage gain of

=1.65V (maximum input threshold limit

)

Results: A is 1.65V in the input, the output voltage is 66.33V, and in the impedance of 8&Omega load; when the equivalent power of 550W, means that if we want to avoid excessive driving A power amplifier, it should avoid the input voltage to 1.65V (maximum input of the system threshold limit). Professional audio。 We can be sure that before the A amplifier connected to the limit value of 1.65V limit circuit (speaker processor or digital divider), A amplifier input will not exceed 1.65V. Therefore, when the speaker processor or digital divider output 1.65V to A power amplifier, A power amplifier output to 66.33V speakers (66.33V=550W@8Ω

), if the speaker processor or digital divider output is greater than the 1.65V voltage to the power amplifier, power amplifier will lead to distortion and output voltage is greater, and will be converted into more power and coil heat, is likely to cause damage to the speaker. In order to protect the speaker, the need to limit the speaker processor or digital divider threshold 1.65V (6.5dBu).

And as the A power amplifier is connected with the B speakers, the following two parameters:

A power amplifier: FTC power 550W@8Ω voltage gain 40 times; A Speaker: 400WRMS (AES/ANSI), impedance 8Ω (speaker power ratio amplifier low 150W).

The maximum voltage capacity calculation steps calculation of

B maximum voltage capacity of V=√ 400W× 8Ω

3200

=56.56V professional audio.

Calculation of

A power amplifier input sensitivity V= maximum voltage the voltage gain of

=1.41V (maximum input threshold limit

)

The results show that the output voltage of the A amplifier is 56 when the input is 1.41V.56V, added to the impedance of 8&Omega load; when the equivalent power of 400W, means that if we want to avoid the maximum power over the loudspeaker should avoid amplifier input voltage up to 1.41V (the maximum input of the system threshold limit). Professional audio。 We can be sure that before the A amplifier connected to the limit value of 1.41V limit circuit (speaker processor or digital divider), A amplifier input will not exceed 1.41V. Therefore, when the speaker processor or digital divider output 1.41V to A power amplifier, A power amplifier output to 56.56V speakers (56.56V=400W@8Ω), if the speaker processor or digital frequency divider output is greater than the 1.41V voltage to the power amplifier, the power amplifier output will lead to greater voltage to the sound box, and the speaker will be converted into greater distortion the coil and the heat, is likely to cause damage to the speaker. In order to protect the speaker, the need to limit the speaker processor or digital divider threshold 1.41V (5).19dBu).

(4)

In the above example, the level control volume of all amplifiers is assumed to be in the maximum position (0dB attenuation), and the input sensitivity and the voltage gain of the amplifier will also change when the power level adjustment knob changes. When the level control of the power amplifier is reduced, the voltage gain is reduced and the input sensitivity is increased.

(5),

AES/ANSI peak power capacity of a speaker allows more than 6dB of the continuous power capacity, that is, the peak power is four times the continuous power. For example, the power of a sound box is 100W, its peak power is 400W.

Similarly, the continuous FTC power capacity of a power amplifier allows its peak to exceed the continuous power of the 3dB, that is, a power amplifier allows its peak power to be two times the continuous power. For example, if the continuous power is 100W, the peak power is 200W.

Therefore, if a power amplifier can provide the peak power of 400W, it is required to have a continuous FTC power of 200W. In other words, if the power amplifier to achieve the peak power capacity of the speaker, the amplifier requires continuous FTC power two times the continuous power of the speaker.

A formula: maximum voltage capacity V=√ maximum power load impedance W× Ω

Formula Two: the maximum power W= maximum capacity load impedance voltage V2× Ω

If a known speaker of the maximum continuous power (AES/ANSI) and indicate the load impedance, can calculate the maximum voltage to the speaker, such as the maximum power is 600WRMS A (ES/ANSI), the impedance is 8Ω the maximum output voltage, hope that through the system pressure limiter or speaker controller set value amplifier A, for the protection of the speaker, the data set into a related formula:

The maximum voltage capacity of V=√ 600W× 8Ω

4800

=69.28V

The resulting 69.28V voltage in 8Ω load impedance, power can produce a maximum of 600WRMS, so we should value cannot exceed 69.28V at the maximum output voltage limiter or speaker controller set power amplifier, can effectively protect the A speaker without getting burned.

(2) power amplifier voltage gain calculation of

Formula Three: voltage gain = output voltage V/ input voltage V

Decided by the relationship between the gain of the audio circuit input and output gain, expressed as multiples (× dB), or represented by the unit, if we want to know a gain of the amplifier (called voltage gain), you must know the input signal level and the corresponding output signal level. For example, known from the system before the signal level is input to the A amplifier is 0.775V, the output signal is 31V, the set of relevant data into equation three that the voltage gain amplifier:

The voltage gain of the output voltage of input voltage V/ = V

=31V/0.775V

(Times)

Also known as the signal level from the system level input to the B amplifier is 0.5V, the output signal is 20V, the voltage gain data set of related in equation three can also be learned:

The voltage gain of the output voltage of input voltage V/ = V

=20V/0.5V

(Times)

Note that the above two cases can be seen, A, B amplifier voltage gain is the same as the 40× two, so the voltage gain size and the size of the input signal.

(3) input sensitivity and voltage gain

Formula four: input sensitivity V= maximum voltage capacity V/ voltage gain of

On the contrary, the power amplifier can not generate power. The amplifier input signal level amplifying a multiple output level, the size of the output is determined by the magnification, the standard argument should be: the output voltage amplifier drives the load impedance of the speaker and thus turn into acoustic power. Professional audio。 The maximum input voltage of a power amplifier can accept is also called the input sensitivity, if the input voltage exceeds the maximum input voltage, the output capacity of the power amplifier will exceed the maximum range, and has a greater frequency response distortion. So if the maximum voltage is divided by the voltage gain, the maximum input voltage (input sensitivity) can be obtained. For example, A power amplifier is connected with the A speakers, the following two parameters:

A power amplifier: FTC power 550W@8Ω voltage gain 40 times; A Speaker: 600WRMS (AES/ANSI), impedance 8Ω (speaker power amplifier 50W.

The maximum voltage capacity calculation steps calculation

A amplifier maximum voltage capacity of V=√ 550W× 8Ω

4400

A power amplifier input sensitivity V= maximum voltage the voltage gain of

=1.65V (maximum input threshold limit

)

Results: A is 1.65V in the input, the output voltage is 66.33V, and in the impedance of 8&Omega load; when the equivalent power of 550W, means that if we want to avoid excessive driving A power amplifier, it should avoid the input voltage to 1.65V (maximum input of the system threshold limit). Professional audio。 We can be sure that before the A amplifier connected to the limit value of 1.65V limit circuit (speaker processor or digital divider), A amplifier input will not exceed 1.65V. Therefore, when the speaker processor or digital divider output 1.65V to A power amplifier, A power amplifier output to 66.33V speakers (66.33V=550W@8Ω

), if the speaker processor or digital divider output is greater than the 1.65V voltage to the power amplifier, power amplifier will lead to distortion and output voltage is greater, and will be converted into more power and coil heat, is likely to cause damage to the speaker. In order to protect the speaker, the need to limit the speaker processor or digital divider threshold 1.65V (6.5dBu).

And as the A power amplifier is connected with the B speakers, the following two parameters:

A power amplifier: FTC power 550W@8Ω voltage gain 40 times; A Speaker: 400WRMS (AES/ANSI), impedance 8Ω (speaker power ratio amplifier low 150W).

The maximum voltage capacity calculation steps calculation of

B maximum voltage capacity of V=√ 400W× 8Ω

3200

=56.56V professional audio.

Calculation of

A power amplifier input sensitivity V= maximum voltage the voltage gain of

=1.41V (maximum input threshold limit

)

The results show that the output voltage of the A amplifier is 56 when the input is 1.41V.56V, added to the impedance of 8&Omega load; when the equivalent power of 400W, means that if we want to avoid the maximum power over the loudspeaker should avoid amplifier input voltage up to 1.41V (the maximum input of the system threshold limit). Professional audio。 We can be sure that before the A amplifier connected to the limit value of 1.41V limit circuit (speaker processor or digital divider), A amplifier input will not exceed 1.41V. Therefore, when the speaker processor or digital divider output 1.41V to A power amplifier, A power amplifier output to 56.56V speakers (56.56V=400W@8Ω), if the speaker processor or digital frequency divider output is greater than the 1.41V voltage to the power amplifier, the power amplifier output will lead to greater voltage to the sound box, and the speaker will be converted into greater distortion the coil and the heat, is likely to cause damage to the speaker. In order to protect the speaker, the need to limit the speaker processor or digital divider threshold 1.41V (5).19dBu).

(4)

In the above example, the level control volume of all amplifiers is assumed to be in the maximum position (0dB attenuation), and the input sensitivity and the voltage gain of the amplifier will also change when the power level adjustment knob changes. When the level control of the power amplifier is reduced, the voltage gain is reduced and the input sensitivity is increased.

(5),

AES/ANSI peak power capacity of a speaker allows more than 6dB of the continuous power capacity, that is, the peak power is four times the continuous power. For example, the power of a sound box is 100W, its peak power is 400W.

Similarly, the continuous FTC power capacity of a power amplifier allows its peak to exceed the continuous power of the 3dB, that is, a power amplifier allows its peak power to be two times the continuous power. For example, if the continuous power is 100W, the peak power is 200W.

Therefore, if a power amplifier can provide the peak power of 400W, it is required to have a continuous FTC power of 200W. In other words, if the power amplifier to achieve the peak power capacity of the speaker, the amplifier requires continuous FTC power two times the continuous power of the speaker.

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