We present the results from our investigations on the dynamic behaviour and threshold Voltages of two novel binary antiferroelectric liquid-crystalline mixtures comprising of different quantities of two components. The first component, (S)-TFMHPBC-11, is classed as a hard antiferroelectric material and exhibits a direct SmA* to SMCA* (paraelectric to antiferroelectric) phase transition. The second component, (S)-DAF-9, is a soft antiferroelectric material in which both ferroelectric (SmC*) and antiferroelectric (SMCA*) phases, separated by several subphases, are observed. By varying the concentration of the two components the observed apparent tilt angle vs. applied field curves of the resulting mixture, in the SMCA* phase, can be 'tuned' from the characteristic tristate curve to a low-hysteresis structure more characteristic for a SmC* phase. whilst maintaining low threshold voltages.