Amazon.com: JBL Stage2 604C 540 Watt a Pair 2 Way Components 6.5" Inch Crossover & tweeters : Electronics
Amazon.com: New Compatible Aftermarket JRX100 2-Way Passive Crossover for JRX-112M & JBL SF12M Monitor Speakers. : Electronics
Amazon.com: EMB CX-31 Replacement Speaker Crossover 2500 Watts Works for JBL, Peavey, Cerwin Vega, Pyle-Pro, Mr.DJ, Many Brands! High and Low Frequency Response : Everything Else