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???
04/28/10 10:01
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 		 #175481 - Probably
Responding to: ???'s previous message
In general the audio range is assumed to be 20Hz to 20kHz, and a reasonable amplifier will deliver the same power at 15kHz as it does at 1kHz. Having said that, PA systems often have a reduced bandwidth to reduce wind noise and feedback. Check the amp specifications.

An amplifier rated to drive a 4 ohm load will also generally be happy with an 8 ohm load, although it will usually only deliver half the power.

600W into a piezo is a lot of power, and (if the piezo can handle) it you will certainly annoy the neighbours as it's VERY LOUD. Piezos aren't terribly delicate, but too much power will melt anything.

List of 33 messages in thread
TopicAuthorDate
Audio amplifier            01/01/70 00:00      
   Probably            01/01/70 00:00      
   kHz            01/01/70 00:00      
      Probably too small amp            01/01/70 00:00      
   Usually not...            01/01/70 00:00      
      specs            01/01/70 00:00      
         Real PA Manufacturers...            01/01/70 00:00      
            rms power ...            01/01/70 00:00      
               "Continuous sine wave power" rated in "RMS Watts"...            01/01/70 00:00      
               Oh yes there is            01/01/70 00:00      
            So hold on then            01/01/70 00:00      
               Exactly!            01/01/70 00:00      
                  Stay away from anything with PMPO rating            01/01/70 00:00      
                     Numbers...            01/01/70 00:00      
         Standards            01/01/70 00:00      
   What's it for?            01/01/70 00:00      
      WOW            01/01/70 00:00      
         transucers            01/01/70 00:00      
            Example Ideas...            01/01/70 00:00      
         Piezos are capacitive            01/01/70 00:00      
            Derating            01/01/70 00:00      
               You still haven't said what it's for!            01/01/70 00:00      
                  The question is            01/01/70 00:00      
                     Not meaningful to guess - we will just produce random noise            01/01/70 00:00      
                        Take any            01/01/70 00:00      
                           600W, how to calculate?            01/01/70 00:00      
                              600W            01/01/70 00:00      
                           But why do you think that it is relevant?            01/01/70 00:00      
                              relevant?            01/01/70 00:00      
                                 High power at high frequencies definitely dangerous.            01/01/70 00:00      
                                    Like or dislike isnt a point            01/01/70 00:00      
                                       rms should be the same, but you can bend the truth a bit            01/01/70 00:00      
                                       Compression driver is what you need...            01/01/70 00:00      

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