7
Connecting Your System
D. INPUT/OUTPUT CONNECTIONS
The STK VP240D/VP120D PA amplifier is designed to be as versatile as possible. The following descriptions of the
input and output connections are designed to help you maximize the unit's potential.
1. XLR Input Jacks
Electronically balanced inputs
accepts a standard XLR male
connector.
Pin1=ground,
Pin2=hot or po).
Pin3=cold or negative(-).
1. GROUND
(shield)
2. HOT +
3. COLD -
1
2
3
Tip PO)
Sleeve GROUND(shield)
2. Barrier Strip Connector
Accept balanced line level
signal by strip wire joints, the
“+” terminal=Hot or Positive,
“
-
” terminal=Cold or Negative,
“ ” =Circuit Ground.
3. Speaker Outputs
Speaker connections are 5 block screw terminal connectors for Low and High impedance.
Each impedance method provides a safe and reliable connection capable of transferring high power signals if properly
connected. To avoid ANY possible shock hazard, the power amplifier should be disconnected from the AC, DC
power source before making any connections. When connecting your speakers using each method, be sure to
pay close attention to proper polarity. Although connecting your speaker systems out of phase using the wrong
polarity will not damage your speakers, it will affect the quality of sound. When using bare wire connections,
be sure that your connections are "clean." If any strands of wire from one connector are allowed to touch the
adjacent connector, damage to your amplifier and sound system could occur.
FIGURE : Low & High Impedance Output
Also be sure above total impedance is less than rated impedance.
NOTE
An amplifiers RMS voltage at rated output may also be determined by
measuring with an RMS voltmeter or calculated using the following formula.
FORMULA : V(RMS) =
√
Z X
√
P
where V = RMS voltage in volts
Z = amp rated load impedance in ohms
p = Power rating in walt (RMS)
EXAMPLE 1 : Using the same 240 watt @ 4 ohms amplifier in the preceding example, substitute into the formula as follow.
V (RMS) =
√
Z X
√
P
V (RMS) =
√
4 X
√
240
V (RMS) = 31
When rounded off, the formula indicates an RMS voltage rating of 31 volts.
EXAMPLE 2 : Using the Load impedance at 100V at 240 Watts
V (RMS) =
√
Z X
√
P
Z = V X V / P
Z = 100²/240 = 41.6 ohm (100V Terminal Minimum Load Impedance)
Output
Cable
