Nexo PS-R2 - Manual (Page 11)

PS G ENERAL S ET - UP I NSTRUCTIONS Page 11/82
2.1.4 Configuring PS15 for Passive or Active Mode
• Remove the six TORX screws that hold the connector panel (figure next page);
• Remove the connector panel so that filter WAGO connectors become accessible;
• In Passive Mode, WAGO connector from filter should be inserted in “Passive In”, and speakers
WAGO connectors should be inserted in connector “Passive Out”.
• In Active Mode, WAGO Connector from filter should be directly connected into to speakers via
speakers WAGO connectors (passive filter is then bypassed).
CONNECTOR PANEL PASSIVE MODE ACTIVE MODE
2.1.5 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 LF, MF and HF sections.
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:
L
max
= Z x S S in mm 2 , Z in Ohm, L
max
in meters
The table below indicates these values, for 3 common sizes.
Load Impedance (Ω) 2 3 4 6 8 12 16
Cable section Maximum Length (meters)
1,5 mm² (AWG #14) 3 4.5 6 9 12 18 24
2,5 mm² (AWG #12) 5 7.5 10 15 20 30 40
4 mm² (AWG #10) 8 12 16 24 32 48 64
IMPORTANT
Long speaker cables induce capacitive effects – up to hundreds of pF depending on the
quality of the cable - with a low-pass effect on high frequencies. If long speaker cables
must be used, ensure that they do not remain coiled while in use.