Kevlar Reinforced Pulp Cone: This Alpine Type-R subwoofer has
a two-piece structural parabolic Kevlar reinforced pulp cone. Kevlar adds strength
and tear resistance to the woofer cone while maintaining the benefits of a pulp
cone design. There is also an oversized inverted dust cap of the same material,
which increases rigidity and virtually eliminates distortion at extreme volume
HAMR: The woofer features a High Amplitude Multi Roll
Surround (HAMR), made of injection molded Santoprene, that allows substantial
linear excursion and greater SPL. The High-Amplitude Multi Roll Surround design
allows extreme excursion without sacrificing valuable cone area. FEA Optimized
for linearity and made with injection-molded Santoprene, the HAMR surround is a
key part of the suspension system that allows extreme excursions with accurate,
Spider with Reinforced Layer Spider Integration: An FEA
optimized progressive Nomex spider with reinforced layer spider integration
ensures reliable and consistent control of the tinsel-leads to eliminate any
possible mechanical noises or interference typical of many high-excursion
Vented VC Heat Sink and Airflow Management System: Alpine's
Patented Radial Vented VC Heat Sink and Airflow Management System actively manages
voice coil temperatures by forcing air directly across the heat sink system. This
helps to minimize power compression and ensures reliable long playing time by
actively removing output-robbing heat from the voice coil. The new one-piece cast
aluminum frame with integrated shorting sleeve uses the entire frame as a heat
sink, allowing sustained power output and handling, even in the most extreme
Optimized Motor Structure: Thanks to its new six-piece,
segmented, double stacked magnet structure, the new Type-R subwoofers have
over 20% more motor force than their predecessors, offering more control over
cone movement. The optimized machined motor structure also creates a symmetrical
magnetic field while optimizing flux density to greatly reduce distortion, while
further improving power handling and output.
Pole Geometry: Alpine's patented Compound Radius Curve pole
geometry ensures a symmetrical magnetic field, while optimizing flux density to
reduce distortion, while further improving power handling and output.
Oversized Voice Coil: The 40mm high-temperature (180°C),
4-layer dual voice coil offers more surface area to handle more power; 350W
RMS / 1000W Peak.
Dual Voice Coils: For increased system flexibility, the
woofer has two 4-ohm voice coils. When the voice coils are wired in parallel
the woofer presents a 2-ohm load; when the voice coils are wired in series
the woofer presents an 8-ohm load.
Spring Terminals: The spring terminals are all located on
one side of the woofer. The terminals will accept pin connectors, single banana
plugs, or bare wire up to 8 gauge.
Jumpers: Included with the woofer are two voice coil terminal
jumpers. These jumpers allow you to easily wire the voice coils in parallel (for a
2-ohm load) or series (for an 8-ohm load).
Enclosure Compatibility: The 8" Alpine Type-R Subs offer
installation flexibility; they are compatible with sealed, vented, or bandpass
enclosures, and infinite baffle installations (no bandpass enclosure specifications
are listed in the manual).
Sealed Box Volume: Alpine recommends a sealed enclosure with
an optimum internal volume of 0.3 cubic feet (from 0.15 to 0.5 cubic feet is
acceptable). Sealed enclosures provide the most control over a woofer, will
handle a lot of power, and provide accurate sonic reproduction, making them
suitable to all types of music.
Vented Box Volume: Alpine recommends a vented enclosure with
an optimum internal volume of 0.7 cubic feet (from 0.25 to 0.7 cubic feet is
acceptable) using a 7"x3/4"x15-1/2" slot port; this yields a tuning
frequency of 36 Hz. Ported (or vented) enclosures typically provide better overall
efficiency than sealed so they are suitable for use with smaller amplifiers, giving
you more bass output from less power. However, this efficiency comes at the expense
of very low frequency output (below 31 Hz).