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Features
Enclosure Compatibility
Features
Overview: The Polk Audio
SR104DVC is a 10" subwoofer designed to provide competition-grade bass
performance when installed in a small sealed enclosure. Its engineering allows
for deep precise bass and accurate music reproduction even at the highest volume
levels.
Dual 4-ohm Voice Coils: This
woofer features dual 4-ohm voice coils that offer flexibility in wiring. When
the voice coils are wired in parallel with each other, the woofer presents a
2-ohm mono load. When the voice coils are wired in series with each other, the
woofer presents an 8-ohm mono load. In addition, each coil may be connected to a
different amplifier channel and each channel will see a 4-ohm load.
Voice Coil:
The Polk Audio SR104DVC utilizes a 2.5 inch
glass/epoxy voice coil former wound with four layers of 0.5mm heavy gauge high
temperature aluminum wire to provide high power handling capabilities up to 700
Watts continuous and incredible reliability. The voice coil is bathed in cooling
air via an extensive network of vents in the pole piece and basket to aid the
woofers heat dissipation.
ABS Cone:
The woofer's injected 1mm thick ABS cone employees a naturally strong and stable geometry for
greater damping stiffness allowing for ultra-low distortion-free bass. The cones
is attached to the voice coil via a 4.5" diameter glass-filled ABS cone coupler
rather than the more common direct voice coil-to-coil neck method. The coupler
better supports the cone to stiffen it, resist torsion and warping.
NBR Surround:
The cone is bonded to its cast aluminum basket
with a soft Nitrile Butyl Rubber Surround that is tuned to absorb unwanted cone
resonance. The surround is also impervious to Ultraviolet rays (sunlight),
temperature extremes and humidity for ultimate long life and reliability
Dual Progressive Roll Spiders:
The Polk Audio woofer uses dual
progressive roll spiders to precisely control the cone's long excursion for the
ultimate in "tight", detailed and musical bass. The Two spiders are oriented
inverse of one another so that as one is rolling up, the other is rolling down
to maintain a constant "springiness" in both directions of travel (in/out) of
the woofer. A spider collar is sandwiched between the dual spider to ensure
precise alignment of the voice coil. The collar also reduces stress on the
suspension for increase durability.
Double Ceramic Magnets:
The SR104DVC utilizes dual ceramic magnets for high bass output and high power
handling capabilities by allowing long linear movement of the cone.
Klippel Distortion Analyzer:
Polk's Klippel Distortion Analyzer uses laser technology to measure and optimize
driver behavior under high output which helps maximize linearity, minimize
distortion, flatten and extend frequency responses of the woofer.
Die-Cast Aluminum Basket:
The SR104DVC features a massive
die-cast aluminum basket to house the 16 pound motor structure. The die-cast
aluminum design add greater rigidity to the frame of the woofer suppressing
mechanical resonance and ringing. The basket is vented to equalize the air
pressure on both sides of the suspension to allow free and linear movement of
the spiders and cone in both directions (in and out). The under-spider vents
feature specially designed curved vanes that smooth the airflow to minimize air
turbulence that could cause noise. Behind the vents are channels that draw hot
air away from the voice coil for better power handling and reliability.
Vented Pole Piece:
Also part of the cooling system, is the vented pole-piece that draws air into
and exhales hot air from the center area of the voice coil. The log cap on the
back of the pole piece has vent holes to channel the air tot he pole piece. The
air channels are shaped to minimize air turbulence and noise.
Hex-Key Terminals:
The Polk SR104DVC utilizes two sets of Hex-key terminals with jumper leads
located on the same side of the woofer for an easy, clean and professional
looking install (A 2.5mm hex-key is provided). The Hex-key terminals can accommodate up to 8-AWG speaker wire (Each terminal can accept two twisted strands of 12-AWG wire or a single 8-AWG
wire).
The voice coils are wired in a parallel 2-Ohm configuration from the factory
using the supplied jumper leads (already installed).
Pre-Conditioning Period:
The SR subwoofers require a pre-conditioning period because the suspension
(spiders and surround) is stiff when brand new. Polk recommends playing the SR
subwoofer at moderate listening levels for anywhere from 40 to 60 hours before
you really crank up the volume. A pre-conditioning period helps loosen the
suspension for better transient response and lower bass frequency extension.
Enclosure Compatibility
Recommended Sealed Box Volume: The Polk SR104DVC should be
mounted into a sealed enclosure with a total internal volume of 1.0 cubic feet.
With a displacement of 0.12 cu/ft, the net volume is 0.88 cu/ft. The manual
included with the woofer incorrectly recommends a sealed enclosure with an
internal volume of 0.66 cu/ft.
Weight Considerations: The SR104DVC is heavy (weighs 24.5
lbs); to adequately support the subwoofer in its enclosure, use 3/4" to 1" MDF
for the front baffle. If you intend to mount the SR104DVC with magnet facing
out, ensure that the pilot holes are small and that you use mounting screws with
an aggressive thread that will seat the subwoofer securely in the baffle.
