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525 A-PMD Series
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
Main Specifications
Recommended Usage
Type
Woofers
Midrange Driver
Tweeter
DC-Diaphragm™
Magnetic Shielding
Real Wood Finish with Urethane/Polyester Finish
Gold-Plated Brass-Extruded Terminals
Frequency Response
Sensitivity
Input Power (Maximum/Nominal)
Crossover Frequencies
Impedance
Dimensions (W x H x D)
Weight
• 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.
Digital Home Theater Speaker Systems
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
NS-525F
Front channels
3-way bass-reflex design
6-1/2" Advanced PMD cone
6-1/2" Advanced PMD cone
1-1/8" Aluminum dome
Yes
Yes
Yes
Yes
35 Hz–50 kHz (-10 dB)
89 dB/2.83 V/1 m
200 W/45 W
500 Hz/3 kHz
6 ohms
7-7/8" x 39-3/8" x 14-3/16"
50.1 lbs.
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.
NS-M525
Surround channels
2-way bass-reflex design
5" Advanced PMD cone
1-1/8" Aluminum dome
Yes
Yes
Yes
Yes
60 Hz–50 kHz (-10 dB)
89 dB/2.83 V/1 m
120 W/30 W
3 kHz
6 ohms
6-15/16" x 12-11/16" x 7-9/16"
9.9 lbs.
NEW PRODUCT BULLETIN
NS-C525
Center channel
2-way acoustic suspension design
Dual 4" Advanced PMD cone
1-1/8" Aluminum dome
Yes
Yes
Yes
Yes
57 Hz–50 kHz (-10 dB)
89 dB/2.83 V/1 m
200 W/45 W
3 kHz
6 ohms
19-11/16" x 6-11/16" x 9-5/16"
16.3 lbs.
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