Email: Password: Remember Me | Create Account (Free)

Back to Subject List

Old thread has been locked -- no new posts accepted in this thread
???
04/30/10 14:18
Read: times


 
#175553 - But why do you think that it is relevant?
Responding to: ???'s previous message
150W peak, 75W rms - but I don't think it has enough cooling for 1 hour at 75W.
http://www.maplin.co.uk/Module.aspx?moduleno=3265

150W peak, unknown rms. And based on size - how much heat can it transport away?
http://cgi.ebay.co.uk/ws/eBayIS...=WDVW&rd=1

150W peak, 75W rms - but how much heat can the 63 gram heavy horn transport away?
http://www.maplin.co.uk/Module.as...63&C=20369

150W peak, unknown rms. How much heat can it handle?
http://www.cybermarket.co.uk/ishop/923...r5502.html

150W peak, unknown rms. How much heat can it handle?
http://www.cybermarket.co.uk/ishop/923...r2774.html

But the question is still - why is it relevant? If you intend to use it for music, then the power at 10kHz is very, very much smaller than the power in the bass range. And if you intend to kill dolphins, then we are talking about special hardware, in which case there exists datasheets with the relevant information.

The normal way to use this kind of tweeters in a sound system is to have a series resistor to reduce the possibility of a high-frequency fedback loop. But you normally don't a filter to strip off the low-frequency sound since a piezo horn has a very high impedance and works capacitive. It basically ignores the almost-DC signals for the bass.

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      

Back to Subject List