In keeping with Infinity’s relentless innovation, they introduced new midrange drivers – the Polygraph and Polydome. The Kappa 9 was a five way speaker, with a reputation for killing amplifiers – its impedance curve drops below 1 Ohm at two different places. Not very forgiving of weak amplifiers. Nevertheless, it has a dedicated following of devoted fans, who love the outstanding bass from them. Subsequently, Infinity produced later generation Kappas (the X.1 and X.2) series that were supposed to tame the Kappas appetite for amps.