Given it works off 3V6 it will be a bridge type. You normally use those to drive by placing a resistor across the terminals, almost any value from 10-33R and rated at 0.5W will do, then feed the signal via a 10uF series capacitor to the outside. Add a 100r resistor in series with the output and connect the shield of the cable to the chassis as a ground. The series resistor along with cable capacitance makes a low pass filter to remove a lot of the switching noise. Otherwise a 10uH series coil as well with a 1k parallel resistor ( or a really low Q coil) will tame a lot of the noise, though it will affect the frequency response.