Connections - Martin Audio SX Series User Manual

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SX SERIES USER GUIDE

SX218

Connections

The SX218 has independent wiring to each of the 18" drivers. This is done so that all four cores of a standard NL4 speaker cable are used

to feed the sub, keeping losses through the cable to a minimum. LF driver 1 is connected to pins 1+/-, LF driver 2 is wired to pins 2+/-.

The link connector is wired in parallel with the input connector. You can drive the SX218 from two amplifier channels, for example directly

out of channel 1 or 3 from an iK42, if you then link the SX218 to a second sub, each amplifier channel will be seeing a 4Ω load. When

driving the sub from a single amplifier channel you will need to use a patch panel that links the amplifier output to both pins 1+/- and pins

2+/- and make sure you use a 4-core NL4 cable to connect from your patch panel to the SX218.

Modifying the wiring

The SX218 input panel has a facility to allow quick and easy modification to link both drivers so the connection to pin 1+ is linked to 2+

and 1- to 2-. Please note that if this modification is done you must not use two channels to drive the SX218, you will effectively be shorting

the amplifier channels together which is likely to cause damage.

To modify the sub, disconnect any speaker cables and carefully remove the panel on which the connector plate is mounted on the rear of

the cabinet. There should be enough slack on the cables going to each driver but if not disconnect the cables from each driver making a

note of the orientation of the wiring. Turn the panel over to expose the rear of the connector plate. At the top of the plate you will see two

pairs of wiring tags. These have a brown, red, black and blue wires feeding them. To convert the wiring solder a short wire link from the

brown to the red terminal and a second link from the black to the blue. Re-connect the drivers if these were disconnected ensuring that

driver polarity is correct. Refit the panel into the cabinet. We would recommend labelling the connector panel to make it obvious that pins

1 & 2 are now linked.

SX SERIES USER GUIDE V2.2

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