| ??? 04/28/10 13:44 Modified: 04/28/10 13:45 Read: times |
#175490 - Usually not... Responding to: ???'s previous message |
Ap said:
The standard audio amplifier(eg PA systems) spec provide test results at 1Khz . If the spec says a bridge power of 2000Watts @ 4ohm (peak ) .Will it be able drive a piezo (600watt rms @ 8ohm) at 15-16Khz frequency range? (sine wave) ,I can see piezo being sensitive elements and prone to destruction . A typical PA amplifier is designed to amplify music and speech. By this an energy distribution of audio spectrum is assumed, which contains only about 10% in the frequency range of 3...20kHz! This is important to know, because the internal protection circuitry, like Baucherot elements, and eventual MOSFET drivers (remember the heavy gate capacitance!) aren't assuming much content at high frequencies either. They can be easily destroyed if you force untypical high output voltages at high frequencies. Be very careful with the power rating of loudspeakers also, as they are usually tested with pink noise, which doesn't contain any relevant power at frequencies above 3kHz. Also, loudspeakers aren't tested by continous signals, but by switching them periodically on and off. So, even a 150W loudspeaker can hardly withstand a coninous power of 150W actually. The voice coil will be destroyed thermically at a few Watts. Kai Klaas |
