Yamaha v1.01 User Manual download pdf (Page 15)

RS15 GENERAL INSTRUCTIONS Page 15/58

2.3.3 Cabling

NEXO recommends the exclusive use of multi-conductor cables to connect the system: the cable kit is

compatible with all the cabinets, and there is no possible confusion between Front and Rear drivers.

Cable choice consists mainly of selecting cables of the correct sectional dimension (size) in relation to

the load resistance and the cable length. Too small a cable section will increase both its serial

resistance and its capacitance; this reduces the electrical power delivered to the loudspeaker and can

also induce response (damping factor) variations.

For a serial resistance less or equal to 4% of the load impedance (damping factor = 25), the maximum

cable length is given by:

max

= Z x S S in mm

, Z in Ohm, L

max

in meters

The table below indicates these values, for 3 common sizes.

Load Impedance (Ω)

2 4 8

Cable section Maximum Length (meters)

1,5 mm² (AWG #14) 3 6 12

2,5 mm² (AWG #12) 5 10 20

4 mm² (AWG #10) 8 16 32

2.3.4 Example

• Each RS15 driver has a 8 Ohms nominal impedance; in omni mode, both loudspeakers can be

driven in parallel on one amplifier channel, presenting therefore a 8/2 = 4 Ohms load impedance.

The maximum acceptable 2x2.5 mm

(AWG #12) cable length L

max

for RS15 with its 2 drivers in

parallel is 10 meters.

• When driven in directional mode, RS15 requires 2 amplifier channels, presenting therefore two

independent 8 Ohm load impedances. The maximum acceptable 4x1.5 mm

(AWG #14) cable

length L

max

for RS15 with its 2 drivers driven independently is 12 meters.

IMPORTANT

Long speaker cables induce capacitive effects – up to hundreds of pF depending on the

quality of the cable - with a high-pass effect on high frequencies. If long speaker cables

must be used, ensure that they do not remain coiled while in use.

LEFT

(FRONT)

2-/2+

RIGHT

(REAR)

1-/1+

OMNI

MODE

DIRECTIONAL

MODE

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Yamaha v1.01 User Manual Page 15

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