[sdiy] Harmonic bandwidth

[Ian Fritz]

At 12:48 PM 1/9/2008, Nicholas Gregorich wrote:
>Ian Fritz wrote:
>>Speaker dynamics: If you put a perfect sawtooth into a speaker you would 
>>be asking for its displacement to change instantaneously.  If you 
>>rephased the harmonics then you would no longer have this step.  Of 
>>course you never have exactly this situation, but the transient 
>>mechanical response of the speaker to a step should be kept in mind.
>>For this reason I think the sawtooth does not make a very good test.
>
>This seems like a valid point, but what bothers me is that there isn't 
>much of a transient effect since there are only 32 harmonics. Adding sines 
>from 100Hz to 3.2kHz shouldn't be causing a speaker to struggle, should it?

I have to admit, I don't really know what this waveform looks like.  How 
fast is the rise, say 10% to 90% at 100 Hz?  What happens when you drive a 
speaker with a square wave?  Isn't there a lot of slewing and ringing?

Ian