Output Wiring
Use heavy gauge cable for speaker connections. The greater the distance between the amplifier
and the speakers, the larger the diameter the cable should be to minimize power losses across
the cable and improve the damping of the speaker. Cable thickness specifications (or gauges)
get larger as the cable gets thinner; thus 14-gauge cable is thicker than 16-gauge cable. Use
the following as a guide: Up to 25 feet use 16-gauge, up to 40 feet use 14-gauge, up to 60 feet
use 12-gauge, up to 100 feet use 10-gauge, up to 150 feet use 8-gauge and up to 250 feet use
6-gauge speaker cable. This will ensure that the resistance of the speaker cable is less than
5% of 4-ohms, resulting in a transmission loss of less than 0.5 dB. With Xi amplifiers Class 2
(NEC) cable may be used. In Bridged Mono operation Class 1 (NEC) cable must be used.
Multi-Way Binding Posts:
Xi amplifiers can accept spade connectors, bare wire, or banana connections (except CE approved
versions). Be sure that all the fine strands of the cable are twisted together and contained within
the connector. If even one strand is loose and can touch the adjacent terminal, a short circuit
may result.
Speakon:
Must use Neutrik Speakon 4 position female connector (NL4FC) or
equivalent. Use speaker cable gauges as specified above for optimum
performance. Stereo or paralleled configuration for both channels:
Pin 1+ is positive, and Pin1- is negative. Using the Mono Bridged
connector, (CH1) Pin 2+ is positive and Pin1+ is negative.
(see Figure E)
Polarity:
Loudspeakers must be connected with consistent polarity for correct phasing between them.
Incorrect phasing will do no physical harm, but frequency response will be affected. The key
is to make sure that both speakers connected to the speaker terminals are hooked up the same
way. Connect (-) at the speaker outputs to (-) on the back of the speaker, and (+) at the speaker
outputs to (+) on the back of the speaker.
Bridged Mono Operation
When in Bridged Mono mode, connect the input signal to CH2 input (CH1 input becomes
disabled). Connect the speaker(s) to the two red (+) binding posts. The CH2 (+) terminal is the
hot (+) (non-inverting) side, and the CH1 (+) terminal is the low (-) (inverting) side. When
connected in this way, each channel sees one-half the impedance of the speaker(s) connected
between them. If and 8-ohm speaker is used, each channel will see a 4-ohm load. Therefore,
it is not recommended that any load lower than a 4-ohm load be connected in this mode of
operation. In Bridged Mono operation Class 1 (NEC) cable must be used. Use Dual Mono mode
for lower impedances. (To use Speakon connectors in Bridged Mono mode see the paragraph
above refencing
Speakon )
NOTE:
Be sure to set both CH1 and CH2 input level controls to the same setting
for equal power distribution to the inverted and non-inverted signals.
WARNING: In bridged mono operation, the output connections are actually a balanced
output configuration. This means that both output terminals have potentially high voltages
present (neither one may be grounded).
Dual Mono:
To configure the amplifier for Dual-mono operation, change the output configuration switches
located on the rear panel of the amplifier. Connect the input source to CH2 (CH1 input is now
disabled). Connect speaker(s) to either CH1, or CH2, or both.
!
DIP Switches:
The Xi Amplifiers have an eight position
DIP switch located at the input of each channel
on the rear of the amplifier. (see Figure F)
CH1 DIP Switch(top to bottom)
Clip Limiter
Low Pass (select 120Hz or 80Hz)
Low Pass Filter (select On / Off)
High Pass (select 80Hz or 40Hz)
High Pass Filter (select On / Off)
Sensitivity (select 0.775V or 1.55V)
CH1 Level Control Bypass
Mono Operation (select Dual or Bridged)
CH2 DIP Switch(top to bottom)
Clip Limiter
Low Pass (select 120Hz or 80Hz)
Low Pass Filter (select On / Off)
High Pass (select 80Hz or 40Hz)
High Pass Filter (select On / Off)
Sensitivity (select 0.775V or 1.55V)
CH1 Level Control Bypass
Operation (select 2 Channel or Mono)
Signal Smart:
Signal Smart is an energy saving circuit in the
Xi amplifiers. When the amplifier is idle for
more than three minutes Signal Smart will
cause the amplifier to go into a standby mode
that significantly reduces current draw in the
amplifier.
Find the Signal Smart Threshold adjustment
on the rear of the amplifier (see figure F). A range from -40dB to -20dB is available. At -40dB very
little signal is required to keep the amplifier turned ON and is considered to be a Bypass setting
for the Signal Smart feature. At a setting of -20dB a much larger amount of signal is required to
overcome the standby function of the signal smart circuit. A setting of about -30db will be virtually
transparent to the user. Once the threshold has been passed an amplifier that is in standby will return
to its full potential in approximately 40 milliseconds, or about the time it take to blink your eyelid.
Sonically, this is transparent and causes little or no abbreviation of the sound if the threshold is not
set to high (-20db).
Turning the threshold control fully counter-clockwise will bypass the Signal Smart feature on the
amplifier.
LIMIT
80
OFF
40
OFF
1.55
BYP
BRDG
CH 1
CH 2
Figure F
8
Speakon NL4 Pinout
Figure E
R
R
GND
R
R
LPF 120
LP ON
HPF 80
HP ON
0.775
LVL
DUAL
OFF
LPF 120
LP ON
HPF 80
HP ON
0.775
LVL
2 CH
LIMIT
80
OFF
40
OFF
1.55
BYP
MONO
OFF
-40 BYP
-20
SIGNAL
SMART
2+
3-
1
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