Yorkville PS218P Owner's Manual

MANUEL DE L'UTILISATEUR

o-ps218p-3v0.pdf

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IMPORTANT SAFETY INSTRUCTIONS

INSTRUCTIONS PERTAINING TO A RISK

OF FIRE, ELECTRIC SHOCK,

OR INJURY TO PERSONS.

CAUTION:

TO REDUCE THE RISK OF ELECTRIC SHOCK, DO

NOT REMOVE COVER (OR BACK).

NO USER SERVICEABLE PARTS INSIDE.

REFER SERVICING TO QUALIFIED

SERVICE PERSONNEL.

Read Instructions:

The

Owner’s Manual

before operation of your unit. Please, save these
instructions for future reference.

Packaging:

Keep the box and packaging materials, in case the unit
needs to be returned for service.

Warning:

When using electric products, basic precautions should
always be followed, including the following:

Power Sources:

Your unit should be connected to a power source only of the
voltage specified in the owners manual or as marked on the unit.
This unit has a polarized plug. Do not use with an extension cord or
receptacle unless the plug can be fully inserted. Precautions should
be taken so that the grounding scheme on the unit is not defeated.

Hazards:

Do not place this product on an unstable cart, stand, tripod, bracket or
table. The product may fall, causing serious personal injury and serious
damage to the product. Use only with cart, stand, tripod, bracket, or table
recommended by the manufacturer or sold with the product. Follow the
manufacturer’s instructions when installing the product and use mounting
accessories recommended by the manufacturer.

The apparatus should not be exposed to dripping or splashing
water; no objects filled with liquids should be placed on the
apparatus.

Terminals marked with the “lightning bolt” are hazardous live;
the external wiring connected to these terminals require installation
by an instructed person or the use of ready made leads or cords.

No naked flame sources, such as lighted candles, should be
placed on the apparatus.

Power Cord:

The AC supply cord should be routed so that it is unlikely that it will
be damaged. If the AC supply cord is damaged

OPERATE THE UNIT

Service:

The unit should be serviced only by qualified service personnel.

should be read and understood

DO NOT

.

INSTRUCTIONS RELATIVES AU RISQUE

DE FEU, CHOC ÉLECTRIQUE, OU

BLESSURES AUX PERSONNES.

AVIS:

AFIN DE REDUIRE LES RISQUE DE CHOC ELECTRIQUE,

N’ENLEVEZ PAS LE COUVERT (OU LE PANNEAU

ARRIERE). NE CONTIENT AUCUNE PIECE REPARABLE

CONSULTEZ UN TECHNICIEN QUALIFIE

Veuillez lire le manuel:

Il contient des informations qui devraient êtres comprises avant
l’opération de votre appareil. Conservez S.V.P. ces instructions
pour consultations ultérieures

Emballage:

Conservez la boite au cas ou l’appareil devait être
retourner pour réparation.

Warning:

Attention: Lors de l’utilisation de produits électrique,
assurez-vous d’adhérer à des précautions de bases
incluant celle qui suivent:

Alimentation:

L’appareil ne doit être branché qu’à une source d’alimentation
correspondant au voltage spécifié dans le manuel ou tel qu’indiqué
sur l’appareil. Cet appareil est équipé d’une prise d’alimentation
polarisée. Ne pas utiliser cet appareil avec un cordon de
raccordement à moins qu’il soit possible d’insérer complètement les
trois lames. Des précautions doivent êtres prises afin d’eviter que le
système de mise à la terre de l’appareil ne soit désengagé.

Hazard:

Ne pas placer cet appareil sur un chariot, un support, un trépied ou une
table instables. L’appareil pourrait tomber et blesser quelqu’un ou subir des
dommages importants. Utiliser seulement un chariot, un support, un trépied
ou une table recommandés par le fabricant ou vendus avec le produit.
Suivre les instructions du fabricant pour installer l’appareil et utiliser les
accessoires recommandés par le fabricant.

Il convient de ne pas placer sur l’appareil de sources de flammes

nues, telles que des bougies allumées.

L’appeil ne doit pas être exposé à des égouttements d’eau ou des
éclaboussures et qu’aucun objet rempli de liquide tel que des vases
ne doit être placé sur l’appareil.

Les dispositifs marqués d’une symbole “d’éclair” sont des parties
dangereuses au toucher et que les câblages extérieurs connectés à
ces dispositifs de connection extérieure doivent être effectivés par un
opérateur formé ou en utilisant des cordons déjà préparés.

Cordon d’alimentation:

Évitez d’endommager le cordon d’alimentation.

L’APPAREIL

Service:

Consultez un technicien qualifié pour l’entretien de votre appareil.

PAR L’UTILISATEUR.

POUR L’ENTRETIENT.

N’UTILISEZ PAS

si le cordon d’alimentation est endommagé.

SAFE_V4.doc Version 4.0 02/11/99 11:54 AM

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INTRODUCTION

The PULSE model PS218P is a powered subwoofer with two 300-watt amplifiers, one for each of its dual 18­inch high-performance woofers. Quick and easy setups are facilitated with features such as a LINE/SPEAKER
push-button which enables you to drive the PS218P's inputs with either line level signal or speaker level
signal, and the inputs will accept either a mono or stereo source. Additionally, the inputs are balanced so that
noise cancellation will be optimized when a balanced line-level source is connected; however an unbalanced
line-level source may also be connected without need for special adjustments or cable adapters.

FEATURES

1. Power Switch, Fuse & LED

The Power Switch and Fuse are located on the
left side of the back panel. Always replace the
fuse with the same type: 8 amp slo-blo (T4A for
230V models).

2. SUBWOOFER LEVEL control

The SUBWOOFER LEVEL control regulates the
PS218P's volume. Set this control for the desired
balance of low frequencies with the rest of your
system. At high operating levels, the subwoofer
power amplifier will be regulated by its limiter.
As a result you may find that increasing the
SUBWOOFER LEVEL control above that
operating level will not have any effect. This is
normal and simply means that maximum
undistorted subwoofer volume has been
achieved. The SUBWOOFER LEVEL control does
not regulate other speakers connected to the
PS218P's PARALLEL THRU jacks.

3. UNGROUNDED/GROUNDED switch

Whenever mixers, AC-powered signal sources
and amplifiers are interconnected there is always
the possibility of a ground loop being created
because something is not grounded the same way
as the rest or because the other connected units
are all ungrounded. Ground loops result in a

continuous 60Hz hum which can be heard
through the speakers. Normally, the PS218P's
ground reference would be lifted with the push­button in the UNGROUNDED position. If a hum
occurs, try setting the button up in the
GROUNDED position. In the UNGROUNDED
mode, the sleeves of the 1/4-inch inputs are lifted
from ground reference. In the GROUNDED mode,
the grounding is done through a 10-ohm
protection device which prevents damage in case
of accidental cable miswiring.

TIP: The use of balanced cables, even if the line­level mixer outputs are unbalanced, will help to
reduce the occurrence of hum and noise.

4. INPUT LEVEL push-button

This feature enables you to drive the PS218P's
inputs with either line level or speaker level
signals. For example, if you have connected one of
the INPUT jacks to a mixer's line-level output, you
would push the button up into the LINE position.
If, on the other hand, you have connected the
INPUT/s to one or two speaker outputs on a
mixer/amplifier or power amplifier, or to a parallel
connection on another speaker, you would push
the button down into the SPEAKER position. It is
important for this feature to be set correctly to
ensure proper performance of the product.

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5. INPUT & PARALLEL THRU Connections
and Balancing

The inputs to the PS218P's dual power amplifiers
are arranged in LEFT and RIGHT parallel pairs.
Internally, the amplifiers share these inputs. In
other words, the signal coming into either of the
INPUT jacks goes to both amplifiers at the same
time (i.e. not separately) and therefore both
speakers are powered. The LEFT/RIGHT INPUT
arrangement simplifies connecting a stereo
source. For example you may simply connect
your left and right stereo amplifier outputs to the
PS218P's INPUT jacks and they will be mixed
down into mono internally to feed the amplifiers.
Meanwhile, the PARALLEL THRU jacks can be
used to feed the stereo signals to another
PS218P's inputs or to a pair of full-range PA
enclosures. On the other hand, if you only have a
mono signal from a mixer or amplifier, or chained
over from another speaker, either one of the
INPUT jacks will do - no need to patch to the
other INPUT jack. The adjacent PARALLEL THRU
jack may then be used to deliver the signal to
another PS218P or, if speaker-level signal is
driving the INPUT jack, to a full-range speaker
enclosure. Additionally, all connectors are
balanced when the push-button is in the LINE
position. The 1/4-inch TRS inputs are wired; tip =
in phase, ring = reverse phase, sleeve = ground
(see under UNGROUNDED/GROUNDED Push­button re: grounding). Because the input
impedance is very high ( >17k Ohms) any
amplifier driving the PS218P in parallel with
external speakers will not encounter a low load
impedance situation caused by the PS218P. Only
the number and impedance of external speakers
determines the overall impedance.

6. The Power Amplifiers

Both amplifiers are rated at 300 watts into 4
Ohms and feature comprehensive protection
from both thermal and input overloads.
Additionally, they are regulated by full-time
electronic limiting and automatic equalization
(see below). The heatsink fins on the back panel
should be kept well away from walls or anything
which could restrict air flow around them. If the
amplifiers overheat, their output power will be
reduced by the limiter to compensate.

7. Internal Subwoofer Limiter and
Automatic Equalization

In order to achieve maximum utilization of the
subwoofer amplifiers and speakers, the amplifiers
are regulated by a sonically transparent limiter
and an automatic equalization circuit. Together
they respond to a variety of potential situations
including excessive heat and clipping distortion
in the amplifier as well as excessive cone
excursions and even voicecoil overheating in the
speakers. The EQ additionally ensures extended
deep bass down to 45Hz at low to moderate
operating levels and, to protect the woofers at
higher operating levels, bass pre-emphasis is
reduced whenever the limiter cuts in. At very
high limiting levels, the EQ will actually cut the
response below 60Hz to ensure that there will be
no distortion or subwoofer cone damage. This
still permits maximum clean sound pressure in
the above-60Hz range for bass drum kicks.

Note: The PS218P built-in stand mounting adapter can be used with Yorkville SW-Teletube
accessory to support our E160 cabinets. The support tube can be adusted up to it's full 5'4"
extension safely as long as the PS218P is not inclined more than 10°.

WARNING: Larger or heavier cabinets should not be used with the stand mount!

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CONFIGURATION OPTIONS