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IMPORTANT SAFETY INSTRUCTIONS
safety-4v1.eps Aug 26/05
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.
INSTRUCTIONS PERTAINING TO A
RISK OF FIRE, ELECTRIC SHOCK,
OR INJURY TO PERSONS
Read Instructions
The Owner’s Manualshould be read and understood
before operation of your unit. Please, save these instruc-
tions 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 dr
ipping or splashing water;
no objects filled with liquids should be placed on the apparatus.
Te
rminals 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 DO NOT OPERATE THE UNIT.
Service
The unit should be serviced only by qualified service personnel.
AVIS:
AFIN DE REDUIRE LES RISQUE DE CHOC ELECTRIQUE,
N’ENLEVEZ PAS LE COUVERT (OU LE P
ANNEAU ARRIERE)
NE CONTIENT AUCUNE PIECE
REPARABLE PAR L’UTILISATEUR.
CONSULTEZ UN TECHNICIEN QUALIFIE
POUR L’ENTRETIENT
INSTRUCTIONS RELATIVES AU RISQUE
DE FEU, CHOC ÉLECTRIQUE, OU
BLESSURES AUX PERSONNES
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 ul
térieures.
Emballage
Conservez la boite au cas ou l’appareil devait être
retourner pour réparation.
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 sp
écifié 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.
Risque
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 tr
épied 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 recommand
és 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 marqu
és d’une symbole “d’éclair” sont des parties
dangereuses au toucher et que les
câblages extérieurs connectés à
ces dispositifs de connection ex
térieure doivent être effectivés par un
opérateur formé ou en utilisant des cordons déjà préparés.
Cordon d’Alimentation
Évitez d’endommager le cordon d’alimentation. N’UTILISEZ PAS
L’APPAREIL si le cordon d’alimentation est endommagé.
Service
Consultez un technicien qualifié pour l’entretien de votre appareil.
Introduction
Your new Yorkville AP4020/4040 power amplifier is designed and built to provide years of trouble free performance. The
AP4020/4040 combines the field proven reliability of our Audiopro amplifiers with customer requested features such as switch-
able limiters, a Mono/Stereo/Bridge switch, and SPEAKON™ output connectors as well as binding posts.
The AP4020/4040 weighs a comfortable but solid 42 pounds, fits into two rack spaces, and reproduces music with over 4000 Watts of
headroom. It will drive reactive phase shifted loads with no difficulty - even though it is fully protected from accidental short circuits. Our
design goal was to create an amplifier which would do exactly what an amplifier should do: reproduce music with great power, com-
plete reliability, and uncompromising signal fidelity. We think you will agree that the Yorkville AP4020/4040 does exactly that.
Inputs
Balanced Inputs
Either XLR or two–circuit ‘Ring, Tip, Sleeve’ Stereo 1/4-inch
PHONE cords may be used. Each channel’s XLR input is inter-
nally paralleled with its phone input (The TIP of the channel ‘A’
PHONE input is connected to pin 2 of its XLR input, the RING is
connected to pin 3, and the Sleeve is connected to PIN 1). PIN
2 is in phase, PIN 3 is 180 degrees out of phase, and PIN 1 is
ground. We recommend using balanced lines for the best hum-
free performance, particularly when chaining multiple amplifiers.
Unbalanced Inputs
Ordinary single circuit Standard 1/4-
inch PHONE plugs may be used to con-
nect unbalanced signals. IMPORTANT
NOTE: Such plugs effectively connect
the ring terminal to sleeve ground, so
they work correctly. However, if you use
a Stereo 1/4-inch PHONE plug on an
unbalanced line, you MUST short the
Ring terminal to the sleeve terminal, oth-
erwise the sensitivity will be 6dB lower
than is specified! (The same applies to
the XLR input: To connect an unbal-
anced source via the XLR input, you must
connect the signal to Pin 2 and ground
BOTH Pin 1 and Pin 3).
Remote Referencing
You can approach balanced perfor-
mance with unbalanced sources by utiliz-
ing the remote reference feature of the AP4020/4040 . Connect
a balanced cable to the AP4020/4040 just as you would if you
were running a balanced line. At the other end, connect Pin 3
and Pin 1 together, (or connect ring to sleeve if you are using
a PHONE plug cable), and plug this modified end into your
unbalanced piece of equipment. This connection enables the
AP4020/4040 ’s input to look down the cable directly at the
output jack of the unbalanced equipment. Any hum voltage
generated across the cable’s impedance will be attenuated by
the common mode rejection of the AP4020/4040.
Driving Multiple AP4020/4040’s
In large installations it is often desirable to operate many
amplifiers in tandem. Since each channel’s XLR input is inter-
nally paralleled with its phone input, you may use the remain-
ing input jack as an output to the next amplifier. Obviously
you will need both XLR to XLR and PHONE to PHONE patch
cords if you are going to tandem more than two amplifiers.
NOTE: These patch cords MUST be balanced whether the
input signal is balanced or unbalanced!
Ground Switch
Switching the ground switch on
the rear panel will disconnect chas-
sis ground from circuit ground. Safety
(earth) ground is still connected to the
chassis. We do not recommend lifting
the ground strap unless you are experi-
encing problems with ground loop hum
in multiple amplifier setups where lifting
the ground straps of all but one ampli-
fier cures the hum problem.
CAUTION: Sometimes hum problems
are an indication of improper AC wir-
ing somewhere else in your system.
Don’t just doctor the symptom by lifting
grounds. Fix the cause by making sure
that the proper electrical wiring safety
regulations have been adhered to.
Modes
Mono Mode
• Channel A & B inputs are paralleled
• Each gain control adjusts the signal level for its respec-
tive channel
• Output signals are of equal phase.
• Two loads are driven.
• Loads are connected between the BLACK and RED post
on each channel.