Output Connections - YORKVILLE PROFESSIONAL Serie Manuel De L'utilisateur

cleaned internally by a qualified service technician when dust
is visible on the heatsink fins.
Note: In an unusually dusty location, without regular filter
inspections, removing the foam filter can extend the operat-
ing time before thermal shutdown could occur. At that time,
the internal heatsinks should be cleaned thoroughly.
Clip LEDS
The CLIP LEDs on the front panel will visibly indicate any sig-
nal excursion beyond the dynamic headroom of the amplifier.
Reliability
The AP800 is designed and manufactured 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 capa-
ble of identifying any deviation from the design center param-
eters. The design of the AP800 is conservative with respect
to the power handling capabilities of the output devices. The
topology guarantees that thermal stress not secondary break-
down will set the limits of operation, while the computer opti-
mized heat dissipation system insures that excessive thermal
stress will not occur. Yorkville's reputation as a manufacturer
of reliable equipment will be further enhanced by the AP800.
The AP800 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 todays CD recordings. The
AP800 is built to survive grueling road conditions and con-
stant 2-ohm operation. Its reliability is a fixed installation run-
ning 4 or 8-ohm studio monitors is without parallel.

Output Connections

The AP800 has 5–way binding posts and Neutrik four con-
tact 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
it's respective binding posts for two channel two cable con-
nections (figure 1).
Speakon™ output A also doubles as the A&B/Bridge connec-
tor. This Speakon™ contains both channels on one connector.
This is convenient when connecting one speaker to the ampli-
fier 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/bi-amp Speakon (figure 3).
To connect a bi-amp speaker, configure the amplifier for ste-
reo and connect to the bridge/bi-amp 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 AP800 comes factory-configured to deliver its maximum
power into a 2-ohm load. However, it is possible switch your
AP800 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 intended to be
used where the load is known. PLEASE NOTE: In the 4-ohm
configuration, the minimum load per channel is 4-ohms and 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 pow-
ers that can be obtained for various configurations and loads.
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