driver inductance importance.

[lbstyling]

Hi all,

Ive been looking into driver measurements recently for my next project and was hoping someone had some answers to this question that I cant seam to get to the bottom of.

I appriciate that a given drivers inductance is responsible for a large amount of frequency response extention, but does it also factor in two other areas-

1) 'resolution' -ie, the ability of the driver to reproduce irregular wave shapes correctly rather than just a sine wave.

2) the reaction time (or rather the delay of reaction time) of the driver to a signal?

The AE drivers are highly focused on this aspect and pride themselves on having low inductance- Im just trying to work out if this only really applies to someone who needs a large bandwidth extention out of a given driver or to everyone, regardless of the application.

[whgeiger]

Never the less, the components of the driving signal remain sine waves and when they all combine a square wave emerges. That path cannot be perfectly followed by a driver, for a variety of reasons, one of which is the inductance of the voice coil. More later.

Regards,

WHG

[mashaffer]

AFAIK, resolution ad reaction time = high frequency response which high inductance would presumably limit.

[lbstyling]

are we sort of saying that all other things being equal -

a driver capable of giving a good (flatish) responce far above its crossover frequency will 'likely' follow the exact profile of a given waveform within its designated band better than a driver that rolls off a reasonable 1 octave above crossover?

And that as inductance is a large aspect of what limits a large woofer from giving good output in to the midrange (other issues with doing this aside) , this is why (all other things being equal) it would be desirable to reduce it regardless of the application?

[crazyhub]

I saved a pdf file from adireaudio.com which tended to prove the utility of low Le values in woofer "speed" behaviour.
I regard this statement as biased information because low Le only affect high frequencies range AFAIK...
PM with personal email adress for those who are interested in this paper.

[winslow]

The problem with that paper was it used a nonstandard definition of transient response.

[whgeiger]

There is an immutable relationship between efficiency and bandwidth of a driver. The product of these two parameters (EBP) can be considered a constant. If you want to improve one it will be at the expense of the other. So, a given driver by design may either respond accurately to slow, but large swings, in a driving signal (call it a woofer), or may respond accurately to fast, but small, sings in driving signal (call it a tweeter); or alternatively, may respond accurately to a signal with dynamics somewhere in between these extremes (call it a squawker). To claim that a single driver, with a single moving system, can respond accurately to the entire gamut of signal dynamics is utter nonsense, no matter how persuasive the argument may be. The degree of accuracy to which each driver responds to a range of signal components will be essentially determined by the extent of the frequency range it was designed to handle; i.e., the narrower the band width the more accurately signal components within it will be reproduced by the driver so designed to handle them.

Regards,

WHG