Page 28 of Digital Home Theater General Catalog by Yamaha Audio & Video

building speakers for natural sound when planning a high quality home theater system speakers should not be merely an afterthought the better the speakers the more fully realized the surround sound effect will be at yamaha we build speakers based on a concept of achieving natural sound so movies concerts and anything you listen to sounds amazingly realistic and lifelike we accomplish this by ensuring that our speakers have wide and flat frequency response wide dynamic range high s/n ratio and extremely clarity in the dialogue/vocals range yamaha s exclusive advanced pmd cone for natural sound reproduction 525 and 325 a-pmd series the advanced pmd polymer-injected mica diaphragm cones are 15 lighter than previous types thanks to the use of a low specific gravity material called pmp poly-menthyl-penten that provides faster response speed of sound rise and fall internal loss has been increased by 43 lessening unwanted resonances to achieve the smooth frequency response that results in naturalsounding vocals aluminum diecast baskets 525 a-pmd series aluminum provides three to five times higher flexural strength than the usual metal or plastic types in addition the baskets are 43 thicker than conventional baskets with the same diameter by ns-525f advanced pmd woofer construction dust cap increasing stiffness and suppressing unwanted resonance detailed musical nuances can be more clearly heard wsd cone midrange and woofer hx series yamaha s white spruce diaphragm wsd material emerged from an intensive search for a light tough diaphragm material that would help us achieve ideal home theater sound the pulp material used for the wsd is manufactured almost entirely from long fibres of canadian evergreen white spruce the world s lightest single-sheet diaphragm material aluminum diecast baskets 525 a-pmd series aluminum provides three to five times higher flexural strength than the usual metal or plastic types in addition the baskets are 43 thicker than conventional baskets with the same diameter by increasing stiffness and suppressing unwanted resonance detailed musical nuances can be more clearly heard waveguide horn hx and ef series modern movie theaters are designed to offer a highly absorptive acoustic environment in which soundtrack recordings with five or more channels can be used to achieve a rich sense of spatial expression to achieve a similar level of spatial expression at home it is therefore necessary to use speakers with a direct/reflected sound ratio that is quite different from the speakers used for conventional music waveguide horn ns-8hx recordings 3cm aluminum dome tweeters with dc diaphragmtm and new frame 525 and 325 a-pmd series the high-performance innovative two-separate chambers with vertical and slanted partitions for strong structure restricts vibration ns-525f three-way mitered construction traditional joint construction slanted partition board vertical frame ladder structure duffuser 16cm advanced pmd cone voice coil spider aluminum diecast basket tweeter features a dome made of an aluminum with a dc diaphragm that integrates the diaphragm and voice coil the magnet is an new extra-powerful neodymium type as a result the tweeter is extremely light to minimize sound loss yet is highly durable it is capable of reproduction all the way up to 100khz which is exceptional performance for a 3cm dome tweeter highs are crisp and clear even at high power levels innovative two separate chambers with vertical and slanted partitions ns-525f the cabinet has two separate chambers for the three drivers the interior has vertical and slanted partitions to decrease standing waves this construction also increases strength for less unwanted vibration and sound reproduction with a greater feeling of depth top plate main magnet bottom yoke shielding magnet shieling yoke how yamaha achieves our ideal sound the key to achieving the purest most natural and most pleasing sound is balance balance among the above three elements balance among all the components that make up the speaker and balance among subjective listening judgments testing and more testing yamaha tests speakers in various ways both before and after production each part of the speaker be it a coil a capacitor or a cabinet is selected out of many alternatives which may be tested for months before a decision is made in the case of cabinets for example we often build 50 to 60 cabinets and test each one in order to test many cabinets with many drivers in many configurations we begin with computer simulations then move to actual prototypes for measuring a myriad of factors such as the variations of standing waves inside the cabinet an anechoic chamber is used to obtain precise acoustic data on pre-production models even speaker finishes are rigorously tested for durability and how they influence the sound we have an environmental room where speakers are tested for 500 hours in amazon rain forest conditions and five different listening rooms where speakers are carefully evaluated reproducing a variety of music and movie sources the final judgment throughout the design process and especially in the final phase our most important test equipments are the ears of our speaker experts having hard data is helpful but deciding which cabinet sounds better and whether the speaker meets yamaha s high standards can only be done by the golden ears of yamaha speaker designers who have dedicated their lives to the pursuit of beautiful natural sound 1 many cabinets are built and tested for each speaker series 2 a testing room that simulates an actual listening room 3 a wide range of parameters are tested 4 speakers undergo harsh environmental testing 1 2 3 4 28

[close]