Recently, colleagues who have listened to the device who often traveled the equipment said that many customers do not know the amplifier for the speakers they need, and the power consumption of the speaker ... So today I wrote this push to talk about the matching of the speaker and the amplifier. Essence The electrical characteristics of the sound expansion system

1. Continuous power (rated power)

Continuous, long -term or RMS (valid value) power (the time of test signal lasts for more than 1 hour), it is also called continuous pink noise power (when using pink noise), long -term sine wave frequency sweeping power ), The final measurement point gives the lowest safety power value.

2. Program power

Program or music power (test signals with music characteristics, about 1 second), it is also known as continuous program power.

3. Peak power

The peak or instantaneous power (the test signal is short -term, less than 0.1 seconds), which gives the highest power value, which is 6DB (four times the rated power) than the continuous/long -term/RMS power.

CSR digital power amplifier

characteristic:

With high -efficiency type D circuits, the amplifier has a small volume, light weight, small heating, and a conversion rate of 95%; the consumption of small power supply is high.

All 1U height design is adopted; the power supply part uses high -efficiency switching power supply to improve the stability of the entire long -term work.

With comprehensive protection functions, overload protection, short circuit protection, temperature protection, DC protection.

Built -in automatic limiting function to avoid excessive input and successful output distortion.

Actual electricity

1. Determine the type of power amplifier (Class A, B, AB, H, D, TD, etc.).

2. The conversion efficiency of each type of power amplifier is as follows: Class A, B, Class A: less than 50%; Class H: about 75%; TD: reaches 90%; Class D: 95%.

3. Need coefficient: The total power calculated can be multiplied by a need for the need, because the music signal is not continuous, so the audio system is not a constant consumption load for the power supply. The system of general language applications requires 0.3-0.5, the theater system is around 0.6, and the night field will be above 0.8.

For example: A night -range project uses 20 TDs 8 ohm 900W two -channel power amplifiers. How much does it need to provide electricity?

Solution: 900 × 2 × 20 = 36000 (watt), 36000 ÷ 0.9 = 40000 (watt), 40000 × 0.8 = 32000 (watt), 32000 ÷ 1000 = 32 (kW). The electricity consumption is 32kW.