Elektor Team
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Active Crossover for Active Loudspeakers

With steep 3-way filters

Based on a Labs project | April 2015 | Find it here
Active Crossover for Active Loudspeakers
Here we present a crossover network giving you everything you need (in electronic terms) to build your own high-end loudspeakers.
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Extra info / Update
Balanced input: 0.25’ inch phone jack or XLR connector
Typical input signal level: 0.5–1 Vrms (line level)
Input impedance: 100 kOhm
THD + noise per channel (BW = 22 kHz):
Bass: 0.0003% at 100 Hz
Midrange: 0.0003% at 2 kHz
Treble: 0.0005% at 7 kHz
Supply voltage: ±16 to ±25 V
Current consumption: 65 mA typical
Download the BOM list
The BOM (Bill of Materials) is the technically exhaustive listing of parts and other hardware items used to produce the working and tested prototype of any Elektor Labs project. The BOM file contains deeper information than the Component List published for the same project in Elektor Magazine. If required the BOM gets updated directly by our lab engineers. As a reader, you can download the list here.
Want to learn more about our BOM list? Read the BOM list article for extra information.
Component list
Component List
All 1% = metal film
R1,R2,R5,R6,R49,R50 = 1kOhm 5%
R3,R4,R32,R33= 100kOhm 5 %
R7,R14,R21,R36,R47 = optional *
R8..R13,R22,R29,R31,R37,R39–R43,R46* = 3kOhm 1%
R15,R17 = 4.7kOhm 1%
R16,R18,R24,R25,R26,R27 = 2.26kOhm 1%
R19,R51 = 3.3kOhm 5%
R20,R35,R45 = 10kOhm 5%
R23,R38,R48 = 100Ohm 5%
R28,R30 = 6.2kOhm 1%
R34,R44 = 180kOhm 5%
P1,P2,P3 = 20kOhm preset, horizontal *
C1,C4,C5,C6,C27–C30 = optional *
C2,C3 = 1µF 63V, PET, 2.5 or 5mm pitch
C7–C16 = 10nF 5%, PET, 5 or 7.5mm pitch *
C17–.C26 = 47nF, 5%, PET, 5 or 7.5mm pitch *
C31–.C44,C52,C53 = 100nF, X7R, 5mm pitch *
C45–C51,C54,C55 = 22µF, 63V, radial, 7mm diam., 2.5mm pitch
D1–D4 = 1N4148
D5,D6 = 1N4001
LED1,LED2 = LED, green, 3mm
IC1–IC7 = NE5532A, DIL case
IC8 = 7812
IC9 = 7912
K1 = 3-way XLR, 6.3mm, socket, Neutrik NCJ6FA-H
K2,K3,K4 = 2-way PCB screw terminal block, 0.2’’ pitch
K5 = 4-way PCB screw terminal block, 0.2’’ pitch
Thermal insulation washer and collar for IC9
Platine 140571-1 *
* see text

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