Cms parameter

[skogs]

Hi!
As far as i can understand, there is a significant inverse relationship between power handling and the Cms-parameter of a driver. It seems that drivers with high power handling tend to have a lower Cms-rating, which means stiffer suspension.

What are the "downsides" to a low Cms-rating? I can't see a strict relationship between sensitivity and suspension stiffness, but i might be wrong.

 

[TBTL]

A stiffer suspension results in a higher resonance frequency, if the moving mass is kept equal. This in turn means that the driver has less low frequency extension. Furthermore, a stiffer suspensions results in a higher Qes unless the motor is stronger to compensate.

 

[skogs]

Thank you for that! If we forget about the low end extension, and focus on for instance 2*Fs and up. Will the Cms-rating tell us something important about how the driver will behave?

 

[TBTL]

Not that much, Cms is relevant around and below fs.

 

[skogs]

Greatly appreciated!

So when looking purely at T/S parameters in regards to midrange performance, Cms is more or less irrelevant when comparing drivers. I guess that leaves Mms as the most important T/S parameter for midrange quality.

 

[TBTL]

You're welcome!

Mms influences efficiency but is not related to quality, if quality means harmonic distortion, smoothness of the frequency response and dispersion. Those properties are not described by T/S parameters.