Yamaha’s Exclusive Advanced PMD Cone for Natural Sound Reproduction (Woofers and NS-525F Midrange Driver)
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 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 (NS-525F Woofer and Midrange Driver)
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. The baskets have also been designed with a wider aperture ratio to permit the air behind the cone to move freely. The are attached to cabinet at six points rather than
NS-525F Advanced PMD Cone Woofer
Aluminum Dome Tweeter and DC-Diaphragm
four as in previous designs for a stronger connection.
1-1/8” Aluminum Dome Tweeters with DC Diaphragm™ and New Frame
The high-performance 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 1-1/8“ dome tweeter. 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.
New Three-Way Design Concept with 6-1/2” Midrange and Woofer (NS-525F)
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
NS-525F Advanced PMD Woofer with Shielding Cover
Dust Cap
Duffuser
6-1/2” Advanced
PMD Cone
Voice Coil
Spider
Aluminum Diecast
Basket
Top Plate
Main Magnet
Bottom Yoke
Shielding Magnet
Shielding Yoke
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: 6-1/2”.
• 6-1/2” Midrange Driver
To effectively take advantage of the light weight and large internal loss that are characteristic of the Advanced PMD material, a 0.35mm thick injection-molded cone was designed. It has a new curved shape that does not produce any peaks or dips to degrade the sound.
•6-1/2” Woofer
The woofer’s 1mm-thick injection-molded cone is a new design. The use of Advanced PMD allowed the cone wall to be thickened without changing its weight, achieving high stiffness. Straightening the cone shape also contributed to improved stiffness. However, even though the material is thicker, its large internal loss effectively restricts peaks and dips.
High-Performance Crossover Networks The crossover networks use high- performance solen capacitors with extremely low loss characteristics, ensuring fast response.
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.
Three-Way Mitered Construction Cabinet with Chamfered Baffle
Yamaha speakers have employed 45° 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 reduce sound diffraction.
Luxurious Real Wood Finish
All 525 A-PMD Series cabinets have surfaces of high quality wood and are given a luxurious and protective polyester coating.
Main Specifications | NS-525F | NS-M525 | NS-C525 | |
Recommended Usage | Front channels | Surround channels | Center channel | |
Type | 3-way bass-reflex design | 2-way bass-reflex design | 2-way acoustic suspension design | |
Woofers | 6-1/2” Advanced PMD cone | 5” Advanced PMD cone | Dual 4” Advanced PMD cone |
Midrange Driver | 6-1/2” Advanced PMD cone | | | |
Tweeter | 1-1/8” Aluminum dome | 1-1/8” Aluminum dome | 1-1/8” Aluminum dome | |
DC-Diaphragm™ | Yes | Yes | Yes | |
Magnetic Shielding | Yes | Yes | Yes | |
Real Wood Finish with Urethane/Polyester Finish | Yes | Yes | Yes | |
Gold-Plated Brass-Extruded Terminals | Yes | Yes | Yes | |
Frequency Response | 35 Hz–50 kHz (-10 dB) | 60 Hz–50 kHz (-10 dB) | 57 Hz–50 kHz (-10 dB) | |
Sensitivity | 89 dB/2.83 V/1 m | 89 dB/2.83 V/1 m | 89 dB/2.83 V/1 m |
Input Power (Maximum/Nominal) | 200 W/45 W | 120 W/30 W | 200 W/45 W | |
Crossover Frequencies | 500 Hz/3 kHz | 3 kHz | 3 kHz | |
Impedance | 6 ohms | 6 ohms | 6 ohms | |
Dimensions (W x H x D) | 7-7/8” x 39-3/8” x 14-3/16” | 6-15/16” x 12-11/16” x 7-9/16” | 19-11/16” x 6-11/16” x 9-5/16” | |
Weight | 50.1 lbs. | 9.9 lbs. | 16.3 lbs. |
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•Dolby, Pro Logic and Double D are trademarks of Dolby Laboratories Corporation. • DTS, DTS-ES and Neo:6 are trademarks of Digital Theater Systems, Inc.
•Product designs and specifications are subject to change without notice.
