Park Audio II GS Series, Owner'S Manual

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CABLE REQUIREMENTS
Input Cables
Make sure to use only shielded cables whether balanced or unbalanced. Shielding
when properly grounded protects a signal against external electrical interference. As a rule,
unbalanced lines of over 3 meters long are not acceptable. Greater distances require a
balanced cable.
Avoid placing input cables close to power cords or power transformers.
Output Cables
The amplifier is capable of delivering high level output current; therefore, the wire
gauge used for speaker cables is particularly important. Inadequate wire gauge adds
significant resistance to the speaker’s own impedance, reducing the power which is actually
delivered to the speaker. It will also result in a decreased damping factor and possible fire
hazard.
Since the power applied to the loudspeaker is of primary concern in system design, we
have included the table below to allow you determine the appropriate wire gauge for your
application.
The table shows the percentage of the power loss in a 10-meter copper multiple-core
cable. This table reflects the power loss as a percentage of the output power of the amplifier
applied to the load. Use this table to determine the power loss to the load at other cable
lengths. For example, if you plan to deliver 1000Watts to 2-Ohms load through 20m of 2.5-
mm2 cable, the power loss in the cable would be 7 % x 2=14 % of 1000W or 140W lost in the
cable.
Power Loss in a 10-meter Cable
Wire Gauge
Cable
Resistance
Cable power loss
8Ohm load
1.5 mm 2
2.0 mm 2
2.5 mm
2
4.0 mm
2
6.0 mm
2
0.24 Ohms
0.18 Ohms
0.15 Ohms
0.09 Ohms
0.06 Ohms
10.7%
8.3%
7%
4.3 %
2.9%
2.9%
2.2%
1.8%
1.1%
0.7%
2Ohm load
5.7%
4.3%
3.6%
2.3 %
1.5%
4Ohm load
14