PowerBass L-1004D, L-1204D, L-1504D Application Manual

Autosound "L" Series Subwoofer

Application 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.

L-1004D
L-1204D
L-1504D

Thank you and Congratulations

Congratulations on your decision to purchase PowerBass “L” 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 “L” 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 “L” WOOFER FEATURES

Injection Molded PP Cone with enlarged Dustcap: A unique injection molding process is used to
add strength to the lightweight polypropylene resulting in a very rigid cone. This results in accurate low
frequency reproduction at high power while offering durability and resistance to heat, humidity and dust.

Large Roll NBR Rubber Surround: This large roll surround is used to ensure long and linear travel
throughout the entire excursion range resulting in more bass output and higher SPL. NBR is particularly
resistant to harsh elements.

Stamped Steel Treated Basket with Voice Coil Perimeter Aero-Vents: This thick stamped steel basket is
manufactured to the highest quality standards. The baskets have been treated with a special non-resonant
coating to reduce “ringing”. Aero-Venting is incorporated in the basket design allowing cooler air to run over
the voice coil and keep the motor structure from overheating. Cooler woofers mean better bass.

Chrome Push Input Terminals: These high strength compression loaded speaker terminals will ac­commodate up to 10-ga wire and ensure maximum current and power transfer.

Large Motor Structure: Just like a car’s engine, the motor structure of a woofer drives the cone. This
large motor will allow your L-series woofer to handle lots of power while delivering accurate linear move­ment for deep tight bass.

BKSV Voice Coil Former: A Black Kapton high temp voice coil former was chosen to reduce heat
while increasing power handling.

Domed One Piece Backplate: The large dome shaped backplate yields a larger surface area to further
concentrate the magnetic field resulting in increased excursion. A “sand blast” finish provides a attrac­tive yet durable look.

Rubber Mounting Gasket: The protective rubber mounting gasket gives an airtight seal which elimi­nates bass robbing air leaks.

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

SERIES

DUAL VOICE COIL WIRING

Parallel-Parallel wiring two dual 4 ohm subs = 1 ohm Series-Parallel wiring two dual 4 ohm subs = 4 ohm

Series wiring a dual 4 ohm sub = 8 ohm

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PARALLEL-PARALLEL

Amplifier

SERIES-PARALLEL

Amplifier

Amplifier

Amplifier

NOTE: Never connect only one coil of a Dual Voice Coil (DVC) speaker. BOTH voice coils must be
connected to the amplifier

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.