Yorkville PX1700 - Manuel (Page 4)

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Remote Referencing
You can approach balanced performance with unbalanced sources by utilizing the remote reference
feature of the
PX1700 . Connect a balanced cable to the PX1700 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 PX1700 ’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
PX1700.
Driving Multiple PX1700’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 tandem more than two amplifiers.
NOTE: These patch cords MUST be balanced whether the input signal is bal-
anced or unbalanced!
Modes
Mono Mode
• Channel A & 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.
Stereo Mode
• 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
• Use channel A input and GAIN control. 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.
Limiter Switch
With the internal limiters activated, the PX1700’s gain is continuously adjusted to fit the signal within
the available dynamic range. Occasional clipping is permitted. The limiters will not only help to
protect your system’s 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
OFF position completely disables both limiters.
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 turn on. In this case, the fault is in the speakers or the speaker cables and
should be located and remedied. No reset of the PX1700 is required to restore proper operation. The
PROTECT LED will stay on if the amplifier has overheated. Check the speaker load impedance and
any restrictions to air flow at the air intake or exhaust vents of the amplifier.