Description:	Single-channel (mono) Linkwitz-Riley 2-way active crossover filter (PCB only).
Manufacturer:	KMTech Design (UK).
Configuration:	Circuit board only, no components, buyer must assemble, instructions included.
Noise-Cancelling  Method:	Onboard differential-mode receiver (when in balanced mode).
Crossover  Frequencies:	User-definable by changing resistor values.
Filter Gradient:	24dB/octave.
Operation  Amplifiers:	3 x OPA2134 ultra-low noise dual audio-grade op-amps (not included).
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 polyester.
Port configuration:	One input, two outputs.
Power Connector:	3 Way 5mm terminal block.
Input Signal  Connector:	3 Way 5mm terminal block.
Output Signal  Connector:	2 x 2 Way 5mm terminal block.
Physical  Dimensions:	100mm x 60mm x 1.6mm.
PCB Mounting:	4mm mounting hole each corner.
	A high performance active crossover filter by  KMTech Design. THIS IS REV 1.2 OF THE BOARD. WE HAVE LISTENED TO YOU AND MADE THREE IMPORTANT MODIFICATIONS. 1. YOU NOW HAVE A CHOICE OF CONFIGURING THE SIGNAL INPUT AS BALANCED OR UNBALANCED USING FOUR RESISTORS. 2. THE RCA PHONO CONNECTORS HAVE BEEN REPLACED WITH 5MM TERMINAL BLOCKS. 3. THE OUTPUT RESISTORS HAVE BEEN REPLACED WITH 6MM TRIMPOTS, BUT YOU CAN STILL USE RESISTORS IF YOU PREFER. CIRCUIT BOARD ONLY, 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 ***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 this product: 3 x OPA2134 ultra-low noise dual audio grade op-amps or compatible. 3 x 8-way IC sockets (optional, can solder ICs directly to the board if you prefer). 2 x 2 way 5mm terminal blocks (optional, can solder wires directly to the board if you prefer). 2 x 3 way 5mm terminal blocks (optional, can solder wires directly to the board if you prefer). 1 x 100k resistor (all resistors 1/4 Watt, metal film 1%) (this resistor is for unbalanced input). 1 x 1k resistor (this resistor is for unbalanced input). 1x wire link (for unbalanced input). 4 x 10k resistor (these resistors are for balanced input). 10 x 11k resistor (for filtering, can use different values depending on required crossover frequency). 2 x 100k 6mm trimpots (or 100 ohm resistors if you prefer). 3 x 100nF ceramic capacitor. 2 x 47uF electrolytic capacitors 10 x 33nF polyester capacitor (for filtering, can use different values depending on required crossover frequency).