important question

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Is there a way to measure how many actual vibrations, how much energy there is coming out a speaker? Not just on the x - axis but the sum of the whole area it covers.
For instance: is there more energy coming out of a bigger hornloaded speaker than our of a smaller hornloaded, same speaker? And how do you measure it? Over the whole audible frequency spectrum?

Because there is too much energy coming out of the midhorn, for instance, compared to the small high frequency horn, at 0° on the axis it will sound good. On the sides as well, on the further sides it won't; there will be energy aka high frequency's missing. If this bounces off the walls it will be weaker in strength than the mid frequency's because they are still strong on the far side. If all this comes back to the listener you will hear less highs, more mids and everything will sound dull. Same on the other side: too much high frequencies to the side compare to mids and it will sound too bright.

So if I'm note mistaking, if your polar dispersion of all your drivers is the same then it will sound good, even without EQ.? 

So f you can actually measure  the amount of frequencies coming out of a particular speaker and compare it to it's frequency bandwidth it is playing and you make sure that number is the same for all the drivers from low to high there are a lot of problems that can be fixed  

Edited by hond - 05 July 2011 at 1:16am

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hond Members Profile Send Private Message Find Members Posts Add to Buddy List Young Croc Joined: 10 October 2009 Location: Louvain BEL Status: Offline Points: 619	Post Options Post Reply Quote hond Report Post Thanks(0) Quote Reply Topic: important question Posted: 05 July 2011 at 1:14am
	Is there a way to measure how many actual vibrations, how much energy there is coming out a speaker? Not just on the x - axis but the sum of the whole area it covers. For instance: is there more energy coming out of a bigger hornloaded speaker than our of a smaller hornloaded, same speaker? And how do you measure it? Over the whole audible frequency spectrum? Because there is too much energy coming out of the midhorn, for instance, compared to the small high frequency horn, at 0° on the axis it will sound good. On the sides as well, on the further sides it won't; there will be energy aka high frequency's missing. If this bounces off the walls it will be weaker in strength than the mid frequency's because they are still strong on the far side. If all this comes back to the listener you will hear less highs, more mids and everything will sound dull. Same on the other side: too much high frequencies to the side compare to mids and it will sound too bright. So if I'm note mistaking, if your polar dispersion of all your drivers is the same then it will sound good, even without EQ.? So f you can actually measure the amount of frequencies coming out of a particular speaker and compare it to it's frequency bandwidth it is playing and you make sure that number is the same for all the drivers from low to high there are a lot of problems that can be fixed Edited by hond - 05 July 2011 at 1:16am

Steve_B Members Profile Send Private Message Find Members Posts Add to Buddy List Old Croc Joined: 29 September 2007 Status: Offline Points: 1587	Post Options Post Reply Quote Steve_B Report Post Thanks(0) Quote Reply Posted: 06 July 2011 at 11:12pm
	In an anechoic situation you need to measure the response at all points around the speaker and then calculate the total power response. An alternative method is to find a totally reverberant space and measure the response beyond the critical distance. The reverberant field is supposed to be uniform and represents the response radiated in all directions. The problem is trying to find a sound source that radiates uniformly to ensure that your measurement system is calibrated and not affecting the reading. A larger horn with the same drive unit may or may not produce more power once the frequency is high enough for the horn to provide a uniform impedance to the drive unit. The larger horn will work to a lower frequency. A designer who has taken care to produce a speaker with a smooth polar response will probably have taken care to ensure all other aspects of the design are optimised. If that is the case then the speaker will generally sound better. With a reflex plus horn type design it is impossible to get a constant dispersion pattern over the entire frequency range. It is important to try and match dispersion characteristics throughout the cross-over region though. EQ may still be needed to obtain a flat or other response that you might find pleasing.