I'd say shop the sensitivity listing, which will put you right back at the infinity kappas, if they need to be around $130 a set and the MM651's are about the same.
I've had neither, as I went with 4 speakers, which limits you to 4ohm selection, running off the 2 channel amp.
ZX are great, period, smooth output and rock and roll accurate.
The 4 I've had and run are polk db, HAT biketronics Titan II, ZX and Pioneer TS-G1644R
polk db's will be a huge dissapointment if you had the infinity's, way less potential, according to ratings, I still have a set, part of the issue is the lack luster crossovers, I ran the polk DB's with the hawgwired crossovers for a week and they were a much better speaker.
but if it had to be two, I'd say another set of kappas. MM series or ZX
2010 FLTRX- r o a d g l i d e
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