KM Tech Loudspeaker Crossovers
Integrated Circuits Can be upgraded. 

More Info or Purchase Stock configuration is Texas Instruments. Can be upgraded to Burr-Brown ICs NE5532 OPA2134 AD825 Power Supply Transformer		More Info Or Purchase
		Driverack PA
	More Info or Purchase Variable Frequency Two Way Crossover

Iono Phones
Crossover Chart
Front End Crossovers Opamp Labs
linkwitz riley
Crossover Calc