SKU: Mundorf-ECAP100-15uF-100V-Bipolar-Capacitor 15uF 100V DC Mundorf Bipolar Audio Capacitor

Mundorf ECap Raw bipolar electrolytic capacitors are an excellent choice for applications where film capacitors are not suitable due to space or budget constraints. These capacitors are specifically engineered for audio signal paths, making them ideal for tasks such as frequency crossover construction, impedance linearisation, and use in series resonant or Zobel circuits.

The ECAP RAW series features foils with surfaces roughened by a specialised etching process. Because capacitance is proportional to surface area, this technique allows for a highly compact design, resulting in the most space-efficient and cost-effective audio capacitors in the Mundorf range. Each capacitor utilises a secondary aluminium foil to provide AC voltage resistance, ensuring they are perfectly suited for handling audio signals.

Technical Specifications:

• Capacitor Type: Audio Electrolytic Bipolar
• Conductor Material: Aluminium Foil
• Tolerance: ±5%
• Temperature Range: -40°C / +85°C (-40°F / +185°F)
• Dielectric Strength: 63/23 Volt DC/AC or 100/35 Volt DC/AC
• Colour: The label imprint is changing from gold to red. The technical details and performance remain unchanged. Supplied colours may vary.

These components are highly reliable for high-quality, stable coupling and filtering, delivering excellent audio performance. They are fully compatible with a wide range of audio equipment, ensuring consistent results across various setups, including high-end audio systems, home electronics, professional audio and car audio systems. Understanding how to use capacitors effectively is key to achieving the best sound from your audio system. Below are simple explanations of how these components function in your setup.

The Role of a Crossover Capacitor

A crossover capacitor acts as a "frequency filter." In a speaker system, it allows high-frequency signals to pass through to the tweeter while blocking low-frequency bass signals. This ensures that the delicate tweeter only receives the frequencies it is designed to handle, preventing potential damage and ensuring clear, detailed treble reproduction.

Understanding Zobel Networks

As a loudspeaker plays higher frequencies, its impedance - the resistance it presents to the amplifier - often increases due to the natural properties of the voice coil. A Zobel network (a capacitor and resistor paired together) is used to "flatten" this rise in impedance. By keeping the impedance stable, the network ensures that your crossover filter operates exactly as intended, resulting in a smoother, more balanced transition between your woofer and tweeter.

Choosing and Using the Right Capacitor

• Maintenance and Upgrades: If you are restoring older speakers, replacing original electrolytic capacitors is a highly effective way to restore their original clarity. Over time, capacitors can dry out and lose their value, which can shift the crossover point and dull the sound.
• Channel Matching: Always replace capacitors in both speakers at the same time. This ensures that the left and right channels remain perfectly matched for optimal stereo imaging.
• Value Selection: You do not need to be an engineer to get great results. If you are replacing existing components, simply match the capacitance value (measured in µF) marked on the original unit; some older parts might be labeled MFD (micro Farads). If you are building a new circuit, these capacitors are designed to be robust and reliable for general-purpose filtering and coupling needs.
• Application Versatility: While these are excellent for crossover construction, they are also highly suitable for signal coupling in audio equipment. They provide a cost-effective way to ensure reliable signal transfer without taking up significant space on your circuit board.

Practical Tips for Implementation:

• Tolerance: When selecting components, a 5% tolerance is generally sufficient for most crossover applications. You do not need to match calculated values exactly; using the closest standard value is standard practice.
• Parallel Connections: If you cannot find a single capacitor of the required value, you can connect multiple capacitors in parallel to achieve the desired total capacitance. This is also a common method for creating high-value capacitors in budget-conscious designs.
• Voltage Ratings: Ensure the chosen capacitor's voltage rating meets or exceeds the requirements of your circuit. In passive crossover networks, 63V and 100V ratings are common and typically sufficient.
• Component Quality: While electrolytic capacitors like the ECap Raw are excellent for space-constrained or cost-sensitive woofer and midrange circuits, film capacitors are often preferred for critical high-frequency (tweeter) applications to ensure long-term stability and lower distortion.
• Maintenance: If you are working with speakers more than 20 years old, it is recommended to replace all capacitors in the network, as their values tend to drift over time, which can shift the crossover point and degrade stereo imaging. Always replace components in both speakers simultaneously to maintain channel matching.