The **AS04004PO-R** is a high-performance, miniature loudspeaker manufactured by **PUI Audio, Inc.** It is specifically designed for applications where space is limited but high-quality sound reproduction is required. --- ## 🛠️ Technical Specifications The following table details the core electrical and physical characteristics of the AS04004PO-R: | Parameter | Specification | | :--- | :--- | | **Manufacturer** | PUI Audio, Inc. | | **Impedance** | 4 Ohms | | **Power Rating (Nominal)** | 3.0 Watts | | **Power Rating (Maximum)** | 4.0 Watts | | **Frequency Range** | 200 Hz ~ 20,000 Hz | | **Sensitivity** | 82 dB (1W @ 0.5m) | | **Magnet Material** | Neodymium (NdFeB) | | **Cone Material** | Paper / Cloth Surround | | **Dimensions** | 40mm x 40mm | | **Depth** | 22.2 mm | --- ## 🔍 Key Electronic Features ### 1. Neodymium Motor Structure The speaker utilizes a **Neodymium (NdFeB)** magnet. Neodymium provides a much stronger magnetic field than traditional ferrite magnets, allowing the speaker to be smaller and lighter while maintaining high efficiency and power handling. ### 2. Impedance and Power At **4 Ohms**, this speaker is designed to draw more current from low-voltage amplifiers, making it ideal for battery-operated devices or small Class-D amplifier circuits. The **3W nominal rating** is quite high for a 40mm driver, indicating robust thermal management in the voice coil. ### 3. Frequency Response With a range starting at **200 Hz**, this is considered a "Full Range" or "Mid-High" driver. It will handle vocals and high-frequency sounds excellently, but it requires an enclosure (box) to produce effective lower-end frequencies. ### 4. Environmental Build The "R" in the suffix typically denotes **RoHS compliance**, ensuring the part is manufactured without hazardous substances like lead or mercury. --- ## 💡 Typical Applications * **Consumer Electronics:** Bluetooth speakers, smart home assistants, and radio receivers. * **Industrial:** Alarm systems, kiosks, and medical device alerts. * **IoT Devices:** Providing voice feedback or auditory signals in compact housings. --- ## 🏗️ Mounting and Integration The AS04004PO-R features a **square frame with mounting holes** at each corner, making it easy to screw directly onto a chassis or internal baffle. It typically uses solder pads for wire attachment.