AUDIOropa PRO LOOP DCCplus Руководство по эксплуатации - Страница 6
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Печатать страницу2.1 Cable cross section and wire diameter
The best audio quality can be reached if the DC (direct current) resistance of the induction loop is between 1
and 3 Ohm. The DC resistance depends on the wire diameter and the wire length. Please follow the steps
below:
1. Calculate the lenght of the loop wire. The wire lenght depends on the size of the induction loop.
2. Use the figure below to get the allowed wire diameter.
Example:
The wire lenght in a rectangular room with a width (W) of 10 m and a length (L) of 30 m is 80 m. According to
the figure below, the wire diameter must be between 0.77 and 1.34 mm. This corresponds to a cable-cross-
sectional area of 0.5 mm² and 1.5 mm².
You can use AWG 20 wire or a wire with a standard diameter of 1.00 mm (cable-cross-sectional area: 0.75 mm²).
Note
The inductive loop system works correct if the DC (direct current) resistance is between 0.5 ohm and
3 ohm.
2.2 Connecting the induction loop
Connect the ends of the loop wires to the terminals (28) on the rear of the amplifier.
OUT
COM
LOOP
18 English
Please note the following information
• The loop amplifier must be located outside of the loop.
• Twist the cable section between the amplifier and the loop (feed cable to
the loop) to prevent interference.
• Use a suitable measurement device (e.g. ohm meter) to make sure that
the loop doesn't have a short-to-ground (no damage on the insulation of
the loop wiring)!
• The distance from the loop level to the normal listening level should be
approx. 1.20 m to 2.00 m.