AP1200 OWNER MANUAL / GUIDE D'OPERATION
Page 2
Your new Yorkville AUDIOPRO 1200 power amplifier is designed and built to provide years of trouble free
performance. The AP1200 starts with the field proven reliability of our innovative AP3000 power amp design
and adds customer requested features like switchable limiters and a MONO/STEREO/BRIDGE switch. We’ve
made the AP1200 power configurable, (see “POWER CONFIGURATION”), which makes it the most versatile
amp in its class. Our continuing research in the field of high power analog amplifier design has resulted in further
reductions in distortion and noise, and even better power efficiency and line utilization. The AP3000 has set
new standards in these categories - the AP1200 exceeds them.
The AP1200 weighs a comfortable but solid 33 pounds, fits into two rack spaces, runs at near digital efficiency,
reproduces music with over 2000 Watts of headroom, draws all the power it needs from a standard AC outlet,
and has the best distortion and noise specifications you can find anywhere. 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
AUDIOPRO 1200 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.
Balanced Inputs :
Either “XLR” or two circuit “ring, tip, sleeve” STEREO 1/4" 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" 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" PHONE plug on an unbalanced line, you MUST short the ring terminal
to the sleeve terminal, otherwise the sensitivity will be 6dB 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 AP1200. Connect a balanced cable to the AP1200 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
AP1200’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 AP1200
INTRODUCTION
INPUTS
