Documents
the work is founded
upon innovative science in the area of material vibration modes (cone
breakup, resonance or ringing). the company, mckenzie acoustical
desig,n brings an unique understanding of loudspeaker diaphragm
vibration modes and several unique technologies to the design of
loudspeaker transducers.
the first document
goes where others either go last or never go at all. i am talking
about the proof of independent verification. the document details a very
simple experiment that will allow you to independently verify the
claims of effectiveness of the vibration mode corrective technique describe.
the problem of
material vibration modes is 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.
