Installation
Location and General Precautions
Observe the following precautions when choosing a location for your amplifier.
A. Do not expose the unit to rain or moisture. If a fluid or foreign object should enter the unit,
disconnect the power plug and contact an authorized dealer or service center. Do not pull out
the plug by pulling on the cord; grasp the plug firmly and pull from socket.
B. Protect from heat and allow adequate ventilation. Place away from direct sources of heat,
such as heating vents and radiators. All components produce some heat during operation, so
make sure that the ventilation holes are not covered and that air is allowed to circulate freely
behind, beside and above the amplifier. Excessive heat is the single greatest cause of component
failure.
Mechanical Considerations
The Xi1850 and Xi2600 require three rack space units (5.25) and a depth of 16 inside the rack,
including the rear supports. Secure the unit mechanically using four screws with washers to
prevent marring the front panel.
Rear Support for Road Applications
If the Xi amplifier is rack mounted and the rack is transported, mechanical support for the rear
of the amplifier is required. This could take the form of a shelf across the rear of the amplifier
or brackets that engage the rear of the amplifier. Rear support is recommended in all Xi amplifier
installations.
Thermal Considerations
When the Xi amplifiers are used free-standing, no thermal considerations are necessary other
than keeping the ventilation holes open. If the amplifiers are rack mounted, ensure that adequate
ventilation exists if front of and behind the amplifier. When several amplifiers are mounted
together in a rack, you may need to provide air inlets from the outside of the rack. The Xi
amplifiers are fan cooled. The fan is internally mounted so that it draws air from the rear of the
chassis and exhausts it out the front. The Xi amplifiers may be stacked directly on top of each
other without spacer panels. If the amplifiers are used with other amplifiers, ensure that the heat
output from the other amplifiers does not interfere with the ventilation of the Xi amplifiers (or vice
versa).
AC Power Considerations
Ensure that the Xi amplifier is plugged into an outlet capable of supplying the correct voltage
specified for your model and enough current to allow full-power operation of all amplifiers plugged
into the outlet. The current demand of a power amplifier varies depending on several factors,
including the impedance of the load, the output level of the amplifier, and the crest factor and
duty cycle of the program material. Under typical conditions reproducing rock music, with both
channels driven into a 4 ohm load to the point where musical peaks are just at the clipping point,
the amplifiers require the following current:
Xi1850:
525W (7.2A) for 117V versions, 525W (3.5A) for 234Vversions
Xi2600:
700W (10A) for 117V versions, 600W (4.0A) for 234V versions
Magnetic Leakage Considerations
The Xi amplifiers may be mounted without concern for magnetic flux leakage, within the confines
of common sense. For example, it is not a good idea to mount a power amplifier near a
microphone input transformer or magnetic storage media.
The input signal can be used with either unbalanced shielded single conductor or balanced shielded
two conductor cables. Use shielded cable to conduct the signal from the source (i.e. mixer, equalizer,
CD player, etc.) to the amplifier.
For Balanced Operation:
1/4 Phone Jack:
Use a 3-conductor TRS
(tip-ring-sleeve) 1/4 Phone Plug. The tip
carries the + (high, non-inverted) side of the
signal, the ring carries the - (low, inverted)
side of the signal and the sleeve is signal ground
(see Figure A).
XLR:
Use a male XLR connector. Pin 2 carries
the+ (high, non-inverted) side of the signal,
Pin 3 carries the - (low, inverted) side of the
signal and Pin 1 is signal ground. (See Figure B).
For Unbalanced Operation:
1/4 Phone Jack:
Use a 3-conductor TRS
(tip-ring-sleeve) 1/4 Phone Pug. The tip
carries the + (high, non-inverted) side
of the signal, the sleeve is signal ground
connect the sleeve to the ring.
(see Figure C).
XLR:
Use a male XLR connector. Pin 2
carries the+ (high, non-inverted) side of
the signal, Pin 1 is signal ground, Pin 3 is
jumpered to Pin 1. (See Figure d).
Input Sensitivity
The input sensitivity of the Xi amplifiers
is set at the factory to 1.55V
RMS
for rated
output. The input sensitivity can be
changed to 0.775V
RMS
by using the
appropriate DIP switch on the rear panel.
The input sensitivity can be set
independently for each channel.
Figure B
Balanced Connection
Balanced Connection
1
2
3
Figure A
Unbalanced Connection
Unbalanced Connection
Better Method
Optional Method
Better Method
Optional Method
1
2
3
1
2
3
Figure C
Figure D
7
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