PowerBass Autosound M-104, M-104D, M-124D, M-154D, M-1004 User Manual
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Autosound "M" Series Subwoofer
Application & Enclosure Guide
Please read through this manual to familiarize yourself with your new speakers. Should your PowerBass
Autosound speaker components ever require service, you will need to have the original dated receipt.
M-104D
M-124D
M-154D
M-104
M-124
M-154
Thank you and Congratulations
Congratulations on your decision to purchase PowerBass “M” series woofers. You now own a woofer of
uncompromising design and engineering philosophy from a factory that truly believes in the relentless
pursuit of perfection. Incorporating the highest quality parts and state-of-the-art materials, these woofers
display the ultimate balance between high fidelity, extreme performance and long-lasting reliability.
At Powerbass USA, Inc. we are confident you will have many years of outstanding enjoyment from your
superior WOOFER investment. For maximum performance we recommend that you have your new PowerBass “M” series Woofer installed by an Authorized PowerBass Dealer.
To learn more about PowerBass, please visit us on the World Wide Web at
http://www.powerbassusa.com
∆ Warning ∆
Continuous exposure to sound pressure levels in excess of 100 dB can cause permanent hearing loss. PowerBass Autosound Speakers
are capable of producing sound pressure levels well over 170 dB. Please observe all local sound ordinances while listening to your
PowerBass Autosound system. PowerBass USA, Inc. accepts no liability for hearing loss, bodily injury, or property damage due to the
result of use or misuse of this product.
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POWERBASS AUTOSOUND "M" WOOFER FEATURES
Proprietary 4-layer, Non-pressed Paper, DDC Finish Cone: The premium grade cones on these subwoofers are blend of papers and wood pulps, and coated in DDC to protect the cone and eliminate distortion. This results in an extremely stiff cone that is resistant to environmental elements while remaining
exceptionally stable even under the stress of high sound pressure levels.
Large Roll Santoprene Surround: This treated large roll surround is used to ensure long and linear
travel throughout the entire excursion range resulting in more bass output and higher SPL.
Rigid Tooled Basket (Powder coated Black Finish) with Voice Coil Perimeter Aero-Vents: This thick
stamped steel basket is manufactured to the highest quality standards to ensure maximum excursion, exceptional alignment of the subwoofer’s motor structure and moving parts while providing an extremely rigid
non-resonant frame.
Chrome Push Input Terminals: These high strength compression loaded speaker terminals ensure
maximum current and power transfer.
Massive Motor Structure: Just like a cars’ engine, the motor structure of a woofer drives the cone.
This large motor will allow your M series woofer to handle lots of power while delivering accurate linear
movement for a tight deep bass.
BASV High Temperature Voice Coil: These specially designed resin coated high temperature voice
coils ensure high power handling and precise linear excursion while maximizing thermal heat dissipation.
Rubber Mounting Gasket: The protective rubber-mounting gasket ensures an airtight seal which eliminates bass robbing air leaks.
Single and Dual 4-ohm Voice Coil: Made with pure EIW wire for multiple woofer applications and
high energy and heat transfer. This makes the voice coil highly efficient, and allows you to play louder for
longer.
Optimally Designed for Both Sealed and Ported Enclosures: for many sonic and installation applications. This gives you a wide range of uses for the M-Series Woofers.
Santoprene® is a registered trademark of ExxonMobil Chemical Co.
WIRING GUIDELINES
It is highly recommended that you seek an authorized PowerBass dealer to properly setup, wire
and install your woofers for maximum performance.
There are multiple ways to wire your woofers depending on your amplifier and system configuration. The use
of multiple voice coils offers you more versatility in system configuration. It is important to know the limits of
your amplifier to optimize its performance. It is always better to use your subwoofer in a mono / bridged mode
if your amplifier has the capabilities. There are basically four different types of wiring configurations: Series,
Parallel, Series-Parallel or Parallel-Parallel. It is possible to change the impedance or load by how the speakers
are to be wired and by the quantity of woofers used.
Parallel wiring a dual 4 ohm sub = 2 ohm
Parallel-Parallel wiring two dual 4 ohm subs = 1 ohm
Series-Parallel wiring two dual 4 ohm subs = 4 ohm
NOTE: Never connect only one coil of a Dual Voice Coil (DVC) speaker. BOTH voice coils must be
connected to the amplifier
DUAL VOICE COIL WIRING
PARALLEL
SERIES
SERIES PARALLEL
PARALLEL-PARALLEL
Series wiring a dual 4 ohm sub = 8 ohm
Amplifier
Amplifier
Amplifier
Amplifier
SINGLE VOICE COIL WIRING
Parallel wiring of two single 4 ohm subs = 2 ohms
Parallel wiring of four single 4 ohm subs = 1 ohms
Series/ Parallel wiring of four single
4 ohm subs = 4 ohms
Single 4 ohm woofer
Amplifier
STANDARD
PARALLEL
Amplifier
PARALLEL
Amplifier
SERIES-PARALLEL
Amplifier
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INSTALLATION EXPERIENCE
Installation of PowerBass Autosound Subwoofers requires experience with a variety of mechanical procedures including enclosure construction. This manual only provides general installation and operation instructions. If you have any reservations about your installation skills, please contact your local Authorized
PowerBass dealer for assistance.
CHOOSING A SPEAKER ENCLOSURE
MULTI ENCLOSURE COMPATIBILITY the PowerBass Autosound Subwoofers are engineered to perform
well in various types of enclosures. These subwoofers offer the versatility of being used in either sealed,
vented or band-pass enclosures. For maximum performance we recommend you have your new PowerBass Autosound Subwoofer installed by an Authorized PowerBass Autosound Dealer.
• SEALED BOX: A sealed or acoustic suspension enclosure is easy to build and typically offers
a smaller size enclosure and greater power handling. It has the most predictable frequency and
phase response; the bass response will roll off slower than that of a ported design. Sealed boxes
typically provide the best musical detail and definition. A well-designed sealed enclosure will exhibit
smooth frequency response with excellent sound quality and great low bass extension. They also
exhibit relatively accurate, punchy bass reproduction for most types of music. If a sealed enclosure
is too large to fit into a specific area of a vehicle, it is possible to decrease the recommended box
volume by using 1.5 pounds per cubic feet of low density, high heat specific box stuffing material.
PowerBass recommends Fiberglass, Dacron, Poly-Fill or long fiber wool for stuffing the enclosure.
(Decreasing the box enclosure however should not exceed 20% of the recommended
size.) When using any type of box stuffing material be sure that the subwoofer’s vented pole piece
is clear from any obstructions, since covering the pole piece will result in loss of bass and can
possibly cause damage to your subwoofer. The most important aspect of a sealed enclosure is to
make sure that it is airtight and solid. If your enclosure has any air leaks or if the panels vibrate or
flex, you will experience a loss of bass output. Using glue and some type of sealant (caulk) on all
seams will ensure a solid constructed box without any air leaks.
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