What exactly is QMS?

[Bobbytwonames 5,000+ posts]

I just received my AB HD15d2 in the mail today. While glancing at the specs I noticed something. Why is the HD15d2 QMS so much different than the rest of the HD lineup? Please see attachment. Thanks for any help!

Click to read more...

 

[nauc 10+ year member]

its probably a typeo. email them and c

qms.. A unitless measurement, characterizing the mechanical damping of the driver, that is, the losses in the suspension (surround and spider.) It varies roughly between 0.5 and 10, with a typical value around 3. High Qms indicates lower mechanical losses, and low Qms indicates higher losses. The main effect of Qms is on the impedance of the driver, with high Qms drivers displaying a higher impedance peak

 

[Slo_Ride 5,000+ posts]

Definitely a typo