low loss suspension? relation with stiffness of the suspension?
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 11th July 2013, 06:43 PM #1 rhythmsandy diyAudio Member   Join Date: Aug 2012 low loss suspension? relation with stiffness of the suspension? what is the relation between the Qms and Cms and low loss suspension? low loss suspension will be loose or tight? High Qms means stiff suspension or loose suspension?
 11th July 2013, 09:42 PM #2 gedlee   diyAudio Member     Join Date: Dec 2004 Location: Novi, Michigan The two things are generally unrelated, except that Qms does depend on fs, which depends on Cms, but Cms and Rms are independent. __________________ Earl Geddes Gedlee Website
 12th July 2013, 02:30 AM #3 rhythmsandy diyAudio Member   Join Date: Aug 2012 generally what is low loss suspension means does it means loosely suspended cone or tightly suspended cone?
 13th July 2013, 05:14 PM #4 Greebster   diyAudio Member     Join Date: Aug 2010 Location: South of the Skyway Neither, means it minimally dampens.
 13th July 2013, 06:29 PM #5 Richard Ellis   diyAudio Member     Join Date: Sep 2006 Location: Mar del Plata, a BIG seasonal getaway city, can see the Ocean from our residence. Let's see if I've got this right & I will attempt to answer, right or wrong...the question posed. Of the two types suspension we are all familiar with let me pose the notion of a "low loss" type(Which is backwards in my understanding). The term low loss infers a type of suspension whereby 'little' is lost...little what? When a cone is set in motion "little is lost" from the vibrations of the cone, thru the suspension, attempting to set in motion, or pass said vibration into the frame or basket of any one driver. An example of that we have seen is the ultra-cheap type driver where the cone material itself is simply folded or pleated to create the surround, or the outer suspension of the cone. Being as the vibrations initiate from the voice-coil, vibrations radiate outward along the cone material itself, thru the folded SAME material into the Basket. This would imply there is little lost transfering vibrational energy.....Low-loss. At the seeming other end of the scale we have another cone with the common surround, the half circle of a type of foam material...If I recall correctly the name of Norosorex....a type of substance that absorbs & dissipates vibrational energy thereby not passing any vibrational energy components.........this would be called the High-loss type. Note we haven't even got into linear motion of the two very different types & their properties, advantages & dis-advantages. __________________________________________________ ____Rick........
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Join Date: Sep 2012
Location: Southern California
Quote:
 Originally Posted by rhythmsandy what is the relation between the Qms and Cms and low loss suspension? low loss suspension will be loose or tight? High Qms means stiff suspension or loose suspension?
High Qms means that the spider and cone surround have more "spring" and less friction than a low Qms driver. Like the other Thiele/Small parameters, it affects the volume and fb tuning of the speaker enclosure to obtain a desired response. In and of itself, it's not a good or bad thing.

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