Unbalanced Inputs - YORKVILLE Professional Serie Manuel De L'utilisateur

Introduction
Your new Yorkville AP6040 power amplifier is designed and built to provide years of trouble free performance. The
AP6040 combines the field proven reliability of our Audiopro amplifiers with customer requested features such as
switchable limiter, a Mono/Stereo switch, and SPEAKON™ output connectors as well as binding posts.
The AP6040 weighs a comfortable but solid 64 pounds, fits into three rack spaces, and reproduces music with
over 7000 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 AP6040 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 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 rec-
ommend using balanced lines for the best hum -free per-
formance, 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 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 sig-
nal to Pin 2 and ground both Pin 1 and Pin 3).
Remote Referencing
You can approach balanced performance with unbal-
anced sources by utilizing the remote reference feature
of the AP6040. Connect a balanced cable to the AP6040
just as you would if you were running a balanced line. At
the other end, connect Pin 3 and Pin 1 together, (or con-
nect 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 AP6040'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 AP6040.
Driving Multiple AP6040's
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 tan-
dem more than two amplifiers.
NOTE: These patch cords MUST be balanced whether the
input signal is balanced or unbalanced!
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