Cone Design: The woofer uses a polypropylene cone that features a
gloss black metallic paint on the polypropylene dust cap with a raised MTX Audio
gothic logo. The Thunder 55 series woofer offers better thermal management and
increased reliability at high Sound Pressure Levels (SPL).
High Roll NBR Surrounds: The
surrounds are made of NBR (Nitrile Butadiene Rubber). The surrounds are stitched
to the cones, providing added strength and durability under high SPL. NBR has
the added benefit of being resistant to ozone and UV rays for extreme
durability. The surround geometry maximizes excursion without sacrificing cone
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: Designed for high
power handling and large linear excursion, the woofer's 2" voice coil is
wound onto a high-temperature former with 428°
Asymmetrical Linear Drive System (ALDS):
The Asymmetrical Linear Drive System consists of a flat, progressive spider that
improves suspension and an extended vented pole piece that smoothes out the
cone's linear motion. The result is high output and low distortion.
Spider Plateau Venting: Heat from the voice coil is vented
through metal-mesh covered vents that surround the back of the spider. As the
woofer travels back and forth, cool air is pulled in
and heated air is pushed out.
Stamped Steel Basket: This
woofer has a stamped steel basket designed to support the magnet
structure and prevent buckling. There is a rubber magnet boot to enhance the
look of the subs when reversed mounted.
Terminals: The woofer features
two pair of heavy-duty chrome push terminals which can accept single or dual
banana plugs, pin connectors or up to 8-gauge speaker wire.
Enclosure Recommendations: For
the best possible sound quality where space is a premium, MTX recommends using a
sealed enclosure. For excellent sound quality with increased output compared to
sealed enclosures (3dB or more), MTX recommends using a vented enclosure.
Recommended Sealed Box
Volume: The sealed box size recommended by MTX has an internal volume
of 1.25 cu/ft.
Recommended Vented Box Volume: The vented box size recommended by MTX
has a net internal volume of 2.00 cu/ft with a slotted port. The port slot dimensions are 14" high,
2" wide, and 16.75" long.
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