Description:	Single-channel (mono) Linkwitz-Riley 3-way active crossover filter (Pack of five PCBs only, no components, buyer must assemble).
Manufacturer:	KMTech Design (UK).
Configuration:	Pack of five circuit boards only, no components, buyer must assemble, instructions included.
Noise-Cancelling  Method:	n/a
Crossover  Frequencies:	User-definable by changing resistor values.
Filter Gradient:	24dB/octave.
Operation  Amplifiers:	5 x OPA2134 ultra-low noise dual audio-grade op-amps.
Power Supply  Filtering:	Ceramic/electrolytic noise bypass capacitors.
Power Supply Type:	Dual 5V-0V-5V DC to 12V-0V-12V DC (see our shop  for suitable PSU).
Transformer Type:	Recommended 6VA dual-voltage toroidal.
Filtering caps:	33nF/3.3nF polyester.
Port configuration:	One input, three outputs.
Power Connector:	3 Way 5mm terminal block.
Input Signal  Connector:	1 x RCA phono connector.
Output Signal  Connector:	3 x RCA phono connector.
Physical  Dimensions:	100mm x 80mm x 1.6mm.
PCB Mounting:	4mm mounting hole each corner.
	THIS IS REV. 1.3 WITH PROVISION FOR 6MM POTENTIOMETERS ON EACH OUTPUT. YOU CAN STILL USED FIXED RESISTORS INSTEAD IF YOU PREFER. A pack of five high performance active crossover filter circuit boards by  KMTech Design. You save a whopping ten pounds! SOLDERING SKILLS REQUIRED.
	Let us know what crossover frequencies you need  and we will get as close as possible by suggesting resistor values.
	For your information, the formula for  calculating the filtering resistor values is: R = 1 / (8.89 x C x f) Where R = resistor value in Ohms f = Desired crossover frequency in Hertz C = 0.00000033 for lower crossover frequency, and 0.000000033 for higher crossover frequency. ***You don't need to worry about the maths! We will do all the  calculations for you! Happy to help!
	Please note there is no enclosure included with  this product, it is as shown in the first listing photo. Components needed to complete each filter: 5 x OPA2134 ultra-low noise dual audio grade op-amps. 5 x 8-way IC sockets. 4 x PCB mount RCA sockets. 1 x 3 way 5mm terminal block. 1 x 100k resistor (all resistors 1/4 Watt, metal film 1%). 1 x 1k resistor. 20 x 11k resistor (for filtering, can supply different values depending on required crossover frequency). 3 x 6mm 100k trimpots (or 100 ohm resistors). 5 x 100nF ceramic capacitor. 2 x 47uF electrolytic capacitors 10 x 33nF polyester capacitor. 10 x 3.3nF polyester capacitor.