mckenzie acoustical design madspeaker.com

Documents


the work is founded upon innovative science in the area of material vibration modes (cone breakup, resonance or ringing).  the company, mckenzie acoustical design brings an unique understanding of loudspeaker diaphragm vibration modes and several unique technologies to the design of loudspeaker transducers.

the first article examines the problem of material vibration modes as universal.  to show this i have  compiled the stock and corrected impulse and frequency response performance of several transducers ranging in size from three to 10-inches in diameter. the stock measurements show the problems caused by the presence of uncontrolled material vibration modes in both cones and dust caps where used. the cone and dust cap (where necessary) was mapped and the corrective technique described in us patent document 20070092101 was applied.

impulse and frequency response graphs are both included as a validity check on the information shown in the frequency response graphs. too many for too long have optimized frequency response graphs to show what they want rather than what is. it is much more difficult to tailor impulse response without the alterations being obvious.

here we examine one transducer in greater detail. the transducer examined is claimed to be of an advanced design. it features a cone that is said to be a composite of several materials that reduces cone breakup. the performance of the transducer, however, does not support such a claim. indeed, the performance of this claimed advance in design suggests that most of the work in material science applied to cone compositions is ineffective in controlling cone breakup.

Many people have been working on cone breakup for a long time with little success. This is not hard to understand when you start measuring the high frequency performance differences in what appear to be very similar transducers. In this short article I look at two five-inch transducers that use same cone and other soft parts, but perform very differently. I also turn the cone into a Whispercone to prove that the documented differences in performance are the result of the cone.

For another short article I documented the performance of an inexpensive eight-inch transducer manufactured in the late 1960s. Not only did this archaic cone design outperform many of today's so called advanced materials cones, but its performance could be improved with minimal treatment with my patent pending material vibration mode control technique. This short article shows how that application turned out.