SKU: V-5718-UP703-PCB UP 70-3 Crossover PCB

Visaton - UP 70/3 Universal Circuit Board for Building Crossovers
Art. No. 5718

Description
The Visaton UP 70/3 is a high-quality universal circuit board designed for building custom 2-way, 3-way, or 4-way loudspeaker crossovers. It features a heavy-duty, thick copper layer that ensures low resistance and excellent power handling for clean signal transfer. The versatile layout is specifically engineered to accommodate complex filter networks, making it easy to integrate impedance compensation circuits and level reduction (attenuation) stages to fine-tune your drivers.

Technical Specifications

• Dimensions: 225 x 180 x 2 mm
• Grid spacing: Pre-drilled pattern to accept a wide variety of premium audio components (capacitors, inductors, and resistors)
• Material: Premium, heavy-duty Epoxy glass fibre board for maximum structural stability and heat resistance

How It Works & What It Does
A crossover network is the brain of a multi-way loudspeaker system, directing the correct frequencies to the woofer, midrange, and tweeter. The UP 70/3 circuit board provides the rugged physical foundation and electrical paths needed to build these networks.

The thick copper traces ensure that high-current signals pass from your amplifier to the speakers without degradation or unwanted resistance. Furthermore, the deliberate layout allows DIY builders to easily implement advanced circuit features:

• Impedance Compensation: Flattens the natural impedance spikes of speaker drivers (such as a woofer's resonant rise), allowing the crossover network to work perfectly and the amplifier to see a stable load.
• Level Reduction: Allows the use of resistor networks (L-pads) to pad down a tweeter or midrange driver that is naturally louder than the woofer, ensuring a perfectly balanced, flat frequency response.

How to Use
Plan your crossover schematic beforehand to determine where your inductors (coils), capacitors, and resistors will sit on the pre-drilled grid. Position larger, heavier components like large bass inductors carefully, securing them to the board with non-conductive cable ties or adhesive if necessary to prevent vibration.

Insert the component leads through the pre-drilled holes to connect them via the solder pads on the underside. Use a high-quality soldering iron and audio-grade solder to create clean, solid joints. When placing multiple inductors on the board, try to orient them at 90-degree angles to one another to minimise magnetic cross-talk and interference. Once fully populated and tested, the rigid epoxy board can be easily mounted inside the speaker cabinet using standoff spacers.