The **ASX02104-R** is a high-quality, miniature electromagnetic speaker component manufactured by **PUI Audio**. It is specifically designed for applications where space is limited but clear audio output is required. --- ## 1. Technical Specifications The following table summarizes the key electrical and physical characteristics of the ASX02104-R: | Parameter | Specification | | :--- | :--- | | **Rated Power** | 0.8 Watts | | **Maximum Power** | 1.0 Watts | | **Impedance** | 4 Ohms ± 15% | | **Sound Pressure Level (SPL)** | 84 dB @ 0.8W / 0.1M | | **Frequency Range** | 500 Hz ~ 20,000 Hz | | **Resonant Frequency (Fo)** | 850 Hz ± 20% | | **Magnet Material** | NdFeB (Neodymium) | | **Dimensions** | 21mm x 14mm | | **Weight** | ~2.3 grams | --- ## 2. Key Features and Construction The ASX02104-R is engineered for durability and high-fidelity sound reproduction in small enclosures. * **Neodymium Magnets:** Uses N38-grade Neodymium magnets, which provide a high magnetic flux density, allowing for high sensitivity despite the small size. * **Space-Saving Design:** Its rectangular "pill" shape (21x14mm) allows it to fit into modern slim-profile electronics where circular speakers cannot. * **Lead-Free (RoHS):** Complies with environmental standards for lead-free soldering and materials. * **Paper Cone / Rubber Surround:** Typically utilizes materials that balance weight and rigidity to ensure clear mid-range frequencies. --- ## 3. Applications Due to its 4-ohm impedance and high SPL, it is commonly used in the following categories: 1. **Handheld Devices:** Mobile radios, scanners, and GPS units. 2. **Medical Equipment:** Portable monitors and diagnostic tools that require audible alarms or voice prompts. 3. **IoT & Smart Home:** Security panels, smart thermostats, and doorbell cameras. 4. **Industrial Controls:** User interface feedback for control panels. --- ## 4. Integration Considerations When designing a PCB or enclosure for the ASX02104-R, keep the following in mind: * **Enclosure Volume:** To achieve the best bass response (closest to 500Hz), a sealed or ported rear chamber should be designed. Without an enclosure, "acoustic short-circuiting" will occur, resulting in very thin sound. * **Polarity:** Ensure correct wiring (indicated by '+' and '-' markings) to maintain phase alignment, especially if using multiple speakers. * **Driving Circuit:** Can be driven by a standard Class-D audio amplifier. Given the 4-ohm impedance, ensure the amplifier is stable at low loads.