I am trying to simulate a current driver using TIP31 transistor for a speaker with known resistor and wattage. Can anyone please help me find a PSpice library for speakers? If there is not a library, how can I simulate the speaker only with information about its wattage and its resistor?
If you only want some reactive load that resembles a speaker (I presume electrodynamic), then a simple series RL will do the job. Try 0.15 mH and 7 Ω for an 8 Ω full-range speaker. If you also want to model the resonance, add a parallel RLC in series with that RL, with, say 50 mH, 50 Ω, 150 μF. At this point, the most you could do is add some parallel resistors, or other parallel RL cells in series with the load to mimick a different slope for higher frequencies. Or you could complicate a bit by adding a would-be transformer between the series RL and the parallel RLC, to mimick some sort of transfer based on magnetic field. You could also add an enclosure, but things get complicated from here on. Here is a quick example with what I said:
The values, as they are now, are not too far off from some Fostex full-range from some ...years ago (as best as I can remember). It's a good enough approximation for a test. Choose your own values for whatever speaker you wish to model after.