![]() ![]() A stiff diaphragm can require more power to produce a desired output as compared to a more flexible diaphragm. For instance, the larger the diaphragm and the smaller the back volume, the stiffer the diaphragm becomes. The back volume can further influence the stiffness of the diaphragm of a speaker. The acoustic performance in the low frequency audio range can be dependent on the back volume size. One purpose of the back volume is to contain the back wave or negative wave emitted from the speaker so that the back wave cannot radiate into the ambient atmosphere and interfere with the positive sound waves, thereby allowing for desired levels of acoustic performance. In the bigger picture, Apple notes that due to the increasing demand for electronic device components with reduced dimensions, yet high performance, integrated speaker assemblies can be designed with limited space available for a back volume.īack volume, also referred to as speaker volume, is the empty air space in communication with the speaker that can provide air to push against to prevent the speaker from being overdriven. Thus, when acoustically in phase, the primary woofer and the two smaller woofers have the effect of substantially canceling the generated forces." ![]() ![]() The force generated by the two smaller woofers can be substantially equal and opposite to the force generated by the primary woofer. For instance, a primary woofer can be positioned between and adjacent to two smaller woofers. It will be understood that alternative force cancellation configurations can be implemented. Two pairs of force-cancelling woofers create rich, deep bass without unwanted vibrations."Īpple's patent application point #0052 states in-part: " The force cancelation can reduce potential rattle or interference of various components in proximity with the speaker module, thereby improving sound quality. ![]() Apple's patent point #0011 states that electronic device comprises a speaker enclosure that includes a six-sided box.Īpple new iMac marketing further states that "The sound system on iMac brings incredible, room-filling audio to any space. Today the US Patent & Trademark Office published a patent application from Apple that relates to the new iMac six-speaker sound system as Apple promotes in their marketing as noted in our cover graphic above. ![]()
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