It'll sound like a square wave though. Piezos naturally filter out a lot of the harmonics, a speaker will not so it's going to sound quiet different than the clean tone you're probably looking for, you'd need to feed it a real sine wave for clean sound. I'm a little iffy on the specs given for that horn as well. It says it's rated for 12 volts and 100 watts, but that means the coil resistance calculates out to 1.44 ohm which sounds low, most car speakers are 4ohm which means the REAL power output of that speaker would only be 36 watts absolute maximum. The 100watts listed is probablhy maximum peak power that it is capable of taking, which you'll never hit. For the price though it seems like a good bet to try you'll never get bass out of it but it should do midrange and highs just fine.