Yorkville Sound AP1020 User Manual
AP1020
AP1020
MODEL TYPE: YS1020
Manual-Owners-AP1020-1v20-web.pdf
IMPORTANT SAFETY INSTRUCTIONS
safety-4v2.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 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 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 PANNEAU 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 ultérieures.
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 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.
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 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. 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 AP1020 power amplifier has been designed and built to provide years of trouble free performance. The AP1020 starts
with the field-proven reliability of our Audiopro amplifiers and customer requested features like switchable limiters and a Mono/Stereo/Bridge
switch. We’ve made the AP1020 power configurable, (see Power Configuration), which makes it one of the most versatile amp in its class.
The AP1020 weighs a comfortable, but solid, 39 pounds; it fits into two rack spaces and reproduces music with over 1200 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,
complete reliability, and uncompromising signal fidelity. We think you will agree that the Yorkville AP1020 does exactly that. We hope
this manual will provide answers to any questions you may have about the features, controls, and characteristics of this amplifier.
Inputs
Balanced Inputs
Either XLR or two circuit Ring, Tip, Sleeve stereo ¼-inch PHONE
cords may be used. Each channel’s XLR input is internally 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 connect unbalanced signals. Important Note: Such
plugs effectively connect the ring terminal to sleeve ground,
so they work correctly. However, if you use a stereo ¼-inch
phone plug on an unbalanced line, you must short the ring terminal to the sleeve terminal, otherwise the sensitivity will be 6
dB lower than is specified! (The same applies to the XLR input;
to connect an unbalanced 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 performance with unbalanced sources
by utilizing the remote reference feature of the AP1020 Connect a
balanced cable to the AP1020 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 AP1020’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 AP1020.
Driving Multiple AP1020s
In large installations it is often desirable to operate many amplifiers in tandem. Since each channel’s XLR input is internally paralleled with its phone input, you may use the remaining 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 chassis ground from
circuit ground. Safety (earth) ground is still
connected to the chassis. We do not recommend lifting the ground strap unless you
are experiencing problems with ground
loop hum in multiple amplifier setups
where lifting the ground straps of all but
one amplifier cures the hum problem.
CAUTION: Sometimes hum problems are an indication of
improper AC wiring 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
The AP1020 can be configured for dual-Mono, Stereo, or Bridged
Mono operation via this rear panel Mode switch. The following is
a description of each mode:
Mono Mode
• Channels A and B inputs are paralleled
• Each gain control adjusts the signal level for its
respective channel
• Output signals are of equal phase.
• Two loads are driven.
• Loads are connected between the black and red
post on each channel.
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Stereo Mode
• Channels A and B inputs are
separate.
• Two independent amplifiers, Amp A and Amp B.
• Two loads are driven.
• Loads are connected
between the black and red posts on each channel.
Bridge Mode
• Channels A and B inputs are paralleled. Gain B
has no effect.
• Output signals are equal in amplitude but opposite in phase.
• One load is driven.
• The load is connected between the two red binding
posts. The black posts are not used.
Subsonic Filter Switch
The AP1020 features a specially designed subsonic filter, which effectively blocks potentially
destructive energy in the band below 40 Hz.
The filter provides a 12 dB/octave skirt below
40 Hz. It is implemented with a two-pole network designed to minimize phase shift down
to 40 Hz. We recommend using this filter in
conjunction with some subwoofers and with
all high power full range cabinets. With the filter disabled, the AP1020 is flat down to 6 Hz,
and rolls off at 12 dB/octave below that.
Limiter Switch
When the internal limiters are activated,
the AP1020’s gain is continuously selfadjusted to fit the signal within the available dynamic range. Occasional clipping
is permitted. The limiters will not only
help to protect your system’s mid-horns
and tweeters, but will automatically make
the best use of the available dynamic
headroom. With the limiters activated, all
you need to do is turn up the signal level
until you start to see some clipping. The
limiters will make sure that you are getting
the maximum clean power output at all
times. Setting the switch to the Out position completely disables both limiters.
that is sophisticated enough to remain inert during transient currents in excess of 40 Amperes and phase angles of more than 45
degrees, yet is capable of protecting the output stage from damage
due to accidental short circuits and improper loads.
DC Protection
In the unlikely event of the AP1020’s outputs “going DC,” a thyristor circuit will short the output terminals and divert all potentially harmful currents away from your speakers.
Thermal Protection
In the unlikely event that the AP1020 overheats, the signal will
be sporadically cut off and the Protect LED will stay on. If further
heating occurs, due to a malfunction, the internal thermal breaker
will interrupt the primary circuit. There is no visible indication of
this rare condition. The AP1020 is designed and tested to operate
under “worst case” conditions without shutting down, check for
blocked airflow if you experience a thermal shutdown.
Cooling
The fan draws air inward from the front and expels hot air through
the rear vents on the amplifier. This is compatible with other
Yorkville power amplifiers (and with most installations). Since hot
air rises, the heated air forcibly expelled from the back tends to
rise away from the equipment rack, this draws cool air from the
floor upwards into the front of the rack. In some cases, where the
rear of the rack is obstructed, it may be necessary to install fans
in the rack to aid cooling. If there are no obstructions, secondary
cooling is not required.
Fan Filter Maintenance
The AP1020 is factory equipped with a fan filter mounted on the
air intake grill on the amplifier’s front panel. Regular cleaning of
this filter will increase the amplifier’s long-term reliability. The filter should be removed and washed at the first sign of visible clogging. This will typically occur every four to six weeks depending
on use and environment. Replacement filters are inexpensive and
can be ordered through Yorkville dealers. The foam filter should
be removed if a regular inspection schedule is not going to be followed. The amplifier can operate without the filter in place, but
the amplifier should be cleaned internally (by a qualified service
technician) when dust is visible on the heatsink fins.
Note: In an unusually dusty location removing the foam filter can extend the operating time before thermal shutdown
could occur. At that time, the internal heatsinks should be
cleaned thoroughly.
Protect LED
In the event of a shorted load, or a load which is of too low an
impedance for the amplifier to handle ,the Protect LED will flash
alternately in about 7-second intervals. The sound may come on
and off at ½-second. In this case, the fault is in the speakers or the
speaker cables and should be located and remedied. No reset of
the AP1020 is required to restore proper operation. The Protect LED
will stay on if the amplifier has overheated. Check the speaker load
impedance, the position of the load select switch, and any restrictions to air flow at the air intake or exhaust vents of the amplifier.
Short-Circuit Protection
The AP1020 is fully protected against all possible passive load
conditions. It can operate with a dead short continuously without
damage. We don’t recommend that you short your AP1020 “just
for fun,” short-circuits create a lot of stress on the output devices.
The output stage uses a unique triple-slope VL limiting scheme
CAUTION: The AP1020 can deliver over 800 Watts of power into a bridged load. Yorkville’s own high power speaker systems have
circuit-breaker protection built in. Although these speakers will protect themselves, they are unlikely to be damaged by a bridged
AP1020. However, many other speaker manufacturers make “high power cabinets” with no protection features at all
Yorkville Sound is not responsible for any damage, which may result as a consequence of exceeding such a speaker’s power handling
capability. Yorkville’s two-year unconditional warranty does not cover any consequential damages to non-Yorkville equipment. Please
consider these facts carefully before you choose to run your AP1020 in bridged mode!
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Clip LEDs
1 kHz Burst
2-ohm Mode 2-ohm Mode 4-ohm Mode 4-ohm Mode
8 180 200 280 310
4 310 380 500 590
2 520 650 n/a n/a
2-ohm Mode 2-ohm Mode 4-ohm Mode 4-ohm Mode
8 165 250 250 290
4 270 350 400 560
2 400 600 n/a n/a
2-ohm Mode 2-ohm Mode 4-ohm Mode 4-ohm Mode
8 550 700 840 1100
4 840 1200 n/a n/a
2 n/a n/a n/a
All values are in Watts. Measurements were made at the 0.1% distortion point. Some continuous
average power measurements required line currents greater than 15 amps. The amplifier under test
was plugged into an ideal power line consisting of a Regulated 120 VAC RMS 60 Hz pure sine
wave. Ordinary AC wall-outlet lines will always exhibit varying and unpredictable amounts of sag.
To produce objectively verifiable and accurate specifications these unknown factors must be
eliminated by using an ideal AC line. When using an ordinary electrical outlet, it will usually be
possible to get 800 Watts when the AP1020 is bridged into 4-ohms. The burst measurement uses a
10 ms burst at 1 kHz with a pause of 1/8 second between bursts. The 1 kHz burst represents the
maximum possible sine wave output power.
One Channel Driven
Power Output
Load
(ohms)
1 kHz Cont.
Average
1 kHz Burst
1 kHz Cont.
Average
1 kHz Burst
Load
(ohms)
1 kHz Cont.
Average
1 kHz Burst
1 kHz Cont.
Average
1 kHz Burst
Load
(ohms)
1 kHz Cont.
Average
1 kHz Burst
1 kHz Cont.
Average
Both Channels Driven
Bridge Mode
The Clip LEDs on the front panel will visibly indicate any signal
excursion beyond the dynamic headroom of the amplifier.
Reliability
The AP1020 is designed by Yorkville Sound. Each unit undergoes
a thorough, temperature cycled burn-in period, and each circuit is
tested by both manual and sophisticated computer-controlled equipment, which is capable of identifying any deviation from the design
parameters. The design of the AP1020 is conservative, with respect to
the power handling capabilities of the output devices. The topology
guarantees that thermal stress, not secondary breakdown, will set the
limits of operation while the computer-optimized heat dissipation
system insures that excessive thermal stress will not occur.
The AP1020 is not only suitable for use in both heavy duty touring
sound reinforcement systems but also when high headroom and low
distortion are needed to fully reproduce the dynamic range and clarity of today’s CD recordings. The AP1020 is built to survive grueling
road conditions and constant 2-ohm operation. Its reliability is a fixed
installation running 4 or 8-ohm studio monitors is without parallel.
Output Connections
The AP1020 has 5-way binding posts and Neutrik four contact Speakon™ connectors for output speaker connections.
Connection to the binding posts can either be made with a
banana plug inserted into the end of the post.
There are two Speakon™ connectors. The Speakons™ are connected to the amplifier’s outputs whether the amplifier is in Stereo,
Mono or Bridge modes. Each Speakon™ output connector (Output
A and Output B) is wired in parallel with its respective binding posts
for two channel two cable connections (figure 1).
Speakon™ Output A also doubles as the A-B/Bridge connector. This Speakon™ contains both channels on one connector.
This is convenient when connecting one speaker to the amplifier
in bridge mode where the speaker is connected across the positives of each amplifier output. Configure the Mode switch for
Bridge and connect the speaker to pins +1 and +2 of the bridge/
biamp Speakon™ (figure 3).
To connect a biamp speaker, configure the amplifier for Stereo
and connect to the bridge/biamp connector but use all four terminals in the Speakon™ connector which will connect A and B
Outputs separately to the speaker (figure 2). Connection configurations are labeled on the back panel.
Impedance Mode Switch
The AP1020 comes factory-configured to deliver its maximum
power into a 2-ohm load. However, it is possible to switch your
AP1020 to deliver its maximum power into 4-ohms. The switch is
located on the rear panel above the line cord. To prevent damage
to the amplifier’s circuitry, only switch modes when the amplifier’s power switch is off. This feature is meant to be used when the
speaker load is known. Please Note: In the 4-ohm configuration,
the minimum load per channel is 4-ohms. The minimum Bridge
load is 8-ohms. Attempting to operate into 2-ohm loads while in
the 4-ohm configuration will cause the amplifier to go into current
limit, thermal limit or both.
The Power specification chart in this manual shows the powers
that can be obtained for various configurations and loads.
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