Nady Systems XA-300 - Manual (Page 6)

FRONT & REAR CONNECTIONS
6
INSTALLATION
To ensure years of enjoyment from your NADY AUDIO XA-300 amplifier, please read and understand this manual thoroughly before
using the unit.
INSPECTION
Your XA -300 amplifier was carefully packed at the factory in
packaging designed to protect the units in shipment. Before
installing and using your unit, carefully examine the packaging
and all contents for any signs of physical damage that may have
occurred in transit.
(Note: Nady Systems is not responsible for shipping damage. If
the unit is damaged, do not return to us, but notify your dealer and
the shipping company immediately to make a claim. Such claims
must be made by the consignee in a timely manner.)
CONTENTS
• Instruction manual
• XA-300 (verify that the unit’s serial number is same as shown on
shipping carton)
• AC Power cord
• Warranty Card
RACK MOUNTING
The XA-300 amplifier is designed for standard 19" rack mounting
as well as “stack” mounting without a cabinet. Use 4 screws and
washers for mounting to the front rack rails. It is also a good idea
to support the amps also in the rear, especially for mobile use
where the amps will be subjected to shocks.
AMPLIFIER COOLING
Also pay close attention to the cooling requirements. Never block
the air vents in the back side and front of the amplifier if the load
seen by amplifier is less than 4 ohms and the amplifier is being
run at high output levels. For best results, in such high output
power applications you should augment the amplifier’s air flow
with a rack cooling system.
10. L/R CHANNEL OUTPUT CONNECTORS
Connections are as depicted on the rear panel and in the follow-
ing CONNECTIONS section on page 7 of this manual.
11. BALANCED INPUT CONNECTORS (1/4" TRS & XLR)
These 1/4" (6.3mm) TRS (Tip/Ring/Sleeve) phone jacks and XLR
jacks are compatible with balanced inputs and are wired as Tip/
Pin 3, Ring/Pin 2, and Sleeve/Pin 1 = Ground. Normal maximum
input level at clipping is .500V RMS. Input impedance is 50K
Ohms. Since the TRS phone jacks and XLR jacks are wired
internally in parallel, you can parallel this unit with another
amplifier by using either the LINE 1/4" jack or the XLR jack
(depending on which you’re using to input your signal) to output
the signal to the input jack of the other amplifier.
The 1/4" TRS phone jacks can also be used for unbalanced
inputs. For TRS phone plugs, simply connect the unused side of
the balanced input to ground. For 1/4" TS phone plugs, no change
is necessary for compatibility with this input. Balanced input
signals are recommended as they are less prone to AC hum. For
long cable runs a source of less than 600 ohms output impedance
is needed to avoid signal loss. For short cable runs an unbalanced
signal input should be suitable.
For stereo (two-channel) operation, use the inputs for both CH-A
and CH-B; for parallel or bridged mono operation, use only CH-A
input. (See MODE SELECTOR SWITCHES below for more
explanation.)
12. MODE SELECTOR SWITCH
The XA-300 amplifier offer 3 modes of operation: PARALLEL,
STEREO & BRIDGED. Slide the switch to one of the three
positions for you application.
• PARALLEL (MONO) INPUT - This mode allows both chan-
nels to operate in parallel with the same signal and without
requiring a Y-cord. In this mode the inputs for both channels are
internally connected, so that you only need to feed a signal into
one of the channels. This still allows independent control of
each channel.
(Note: Do not select this “Parallel” mode when
feeding the amplifier 2 separate signals.)
(Note: Do not use both unbalanced and balanced cables in the
same set-up as that can unbalance all the connections when
daisy-chaining, resulting in hum.)
• STEREO INPUT - This is the most common mode generally
used, and allows independent control of 2 separate signals
such as stereo playback, main and monitor live mixes, and bi-
amp operation (highs in one channel and lows in the other).
• BRIDGED MONO - This mode combines the power of both
channels to drive a single speaker. In this mode the amp
produces 4 times the peak power and 3 times the sustained
power into a 4 or 8 ohm speaker than each channel can deliver
separately in stereo or parallel mode.
(CAUTION: In this mode the amplifier can deliver high power
into a speaker. Make sure that the speaker, connectors and
wiring can handle this output. Note that for prolonged
overdriven outputs into a 4 ohm speaker the breaker may trip,
so care must be taken not to overload the amplifier in such
operation.)
Connect the input signal to CH-A input for bridged mono
operation.
13. FANS
The variable speed fans switch between idle speed and high
speed automatically to maintain the proper internal operating
temperature.