Description................................Single-channel (mono) 2-way active crossover filter for 12V vehicles PCB ONLY.

Manufacturer............................KMTech Design (UK).

Output Level.............................Independent output level adjustment via dual trimmer potentiometers.

Noise-Cancelling  Method.........N/A

Crossover  Setting.....................User-definable by changing filter resistor module (FRM).

Filter Gradient..........................12dB/octave.

Operation  Amplifiers...............2 x NE5532 op-amps or compatible.

Power Supply  Filtering............Ceramic/electrolytic noise bypass capacitors.

Power Supply Type...................12V vehicle battery.

Filtering caps.............................33nF polyester.

Port configuration.....................One input, two output.

Power Connector.......................2-way 2.54mm pin headers.

Input Signal  Connector............2-way 2.54mm pin headers. 

Output Signal  Connector..........2-way 2.54mm pin headers.

Physical  Dimensions.................60mm x 35mm x 1.6mm.

PCB Mounting...........................4x 3mm mounting hole.


Introducing the X-Over/DY, a new active crossover filter kit from  KMTech Design.

  • Now changing the crossover frequency is as simple as unplugging a resistor module!
  • Independent output level adjustment via dual trimpots. 
  • Very compact 60mm x 35mm size.

Purchase Options:

Main PCB and filtering resistor daughterboard (FRM).
Extra FRMs.


Components needed to finish one unit. 

  • ·         2 x NE5532 dual audio-grade op-amps (or compatible).
  • ·         1x TLE2426 precision virtual ground IC.
  • ·         2 x Dip-8 IC sockets. 
  • ·         4x 2-way 2.54mm pin headers.
  • ·         1x 7-way 2.54mm pin header.
  • ·         1x 7-way 2.54mm female pin header (for the FRM).
  • ·         Appropriate length wires fitted with 2-way 2.54mm Dupont connectors.
  • ·         1 x 100k resistor (all resistors 1/4-Watt, metal film 1%).
  • ·         1 x 1k resistor.
  • ·         4 x resistors of your choice for the FRM (Filter Resistor Module).
  • ·         2 x 6mm 50k trimmer potentiometers.
  • ·         2 x 100nF bypass ceramic capacitor.
  • ·         2 x 47uF bypass electrolytic capacitors .
  •       1x 220uF electrolytic capacitor.
  • ·         4 x 33nF polyester capacitor.
  • ·         4 x 3mm PCB pillars.



Filter Resistor Modules.

You may wish to experiment with different crossover frequencies. We make this easy and cheap, by giving you the option to purchase additional FRMs (PCB only).


Use the formula Crossover frequency (Hz) = 1 / (0.000207 x R(kOhms))

or consult the following table.

FRM (kOhms) Crossover frequency (Hz)

1.0 .................4822
1.1 .................4391
1.3 .................3716
1.5 .................3221
1.6 .................3019
1.8 .................2684
2.0 .................2415
2.2 .................2196
2.4 .................2013
2.7 .................1789
3.0 .................1610
3.3 .................1464
3.6 .................1342
3.9 .................1239
4.3 .................1123
4.7 .................1028
5.1 ...................947
5.6 ...................863
6.2 ...................779
6.8 ...................710
7.5 ...................644
8.2 ...................589
9.1 ...................530
10.0 .................482
11.0 .................439
13 ....................372
15 ....................322
16 ....................302
18 ....................268
20 ....................242
22 ....................220
24 ....................201
27 ....................179
30 ....................161
33 ....................146
36 ....................134
39 ....................124
43 ....................112
47 ....................103
51 ......................95
56 ......................86
62 ......................78
68 ......................71
75 ......................64
82 ......................59
91 ......................53


Please note there is no enclosure or components included with  this product, it is as shown in the first listing photo.