Exclusive Advanced PMD Cone for Natural Sound Reproduction |
The Advanced PMD (Polymer-injected Mica Diaphragm) cones are 15 percent 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 percent, lessening unwanted resonances to achieve the smooth frequency response that results in natural-sounding vocals. The proportion of base resin (powdered mica) and filler (talc) was determined by extensive listening tests, also in order to achieve natural vocals. The suspension (spider material and shape) was also re-designed for better bass response and wider dynamic range. Finally, the pearl white external appearance provides an impression of fresh, clean sound. |
Aluminum Diecast Baskets |
Aluminum provides three to five times higher flexural strength than the usual metal or plastic types. In addition, the baskets are 43 percent thicker than conventional baskets with the same diameter. By increasing stiffness and suppressing unwanted resonance, detailed musical nuances can be more clearly heard. The baskets have also been designed for a wider aperture ratio to permit the air behind the cone to move freely. They are attached to the cabinet at six points rather than four as in previous designs for a stronger connection. |
1 1/8" Aluminum Dome Tweeters |
The high-performance tweeter features a dome made of aluminum, with a DC Diaphragm that integrates the diaphragm and voice coil. The magnet is a 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 100 kHz, which is exceptional preformance for a dome tweeter of this size. Highs are crisp and clear even at high power levels. The tweeter frame utilizes a new design that provides a better connection to the diaphragm edge to prevent frequency response degradation due to reflected waves. The aperture angle of the defuser has been increased for more natural transmission of the sound from the diaphragm. In addition, smaller size and higher stiffness result in better sound image localization and depth reproduction. |
Three-Way Design Concept |
For transitioning smoothly and seamlessly to the high range and reproducing natural vocals, the diaphragms must have light weight and large internal loss. On the other hand, for high quality bass with a low minimum resonance frequency and high resolution, they must be heavy and have high stiffness. In order to balance these opposing requirements in a single speaker, Yamaha decided to make both midrange and woofer the same size. |
Two Separate Chambers with Vertical and Slanted Partitions |
The NS525F's 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 wanted vibration and sound reproduction with a greater feeling of depth. |
Three-Way Mitered Construction Cabinet |
Yamaha speakers have employed 45-degree mitered-joint construction at the cabinet corners and baffle/body joints for many years. On the 525 A-PMD Series, mitered construction is also used for the back panel, improving the tightness of the joints so the entire cabinet behaves as a single body. This improves low frequency response and reduces unwanted vibration. In addition, the chamfered baffle acts to reproduce sound diffraction. |
Included With Purchase |
Stand (R x 2, L x 2), screws, pad x 4. |
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