{"product_id":"bluetooth-4-0-csr8645-amplifier-board-5w-5w-apt-x-stereo-receiver-amp-module","title":"Bluetooth 4.0 CSR8645 Amplifier Board 5W+5W APT-X Stereo Receiver Amp Module","description":"\u003cmeta name=\"description\" content=\"Buy Bluetooth 4.0 CSR8645 Amplifier Board 5W+5W APT-X Stereo Receiver Amp Module online in India at best price from The Engineer Store, Bengaluru. Authentic product, 7-day warranty on manufacturing defects, fast delivery across India.\"\u003e\n\n\u003ch1\u003eBluetooth 4.0 CSR8645 Amplifier Board 5W+5W APT-X Stereo Receiver Amp Module\u003c\/h1\u003e\n\n\u003cp\u003eThe Bluetooth 4.0 CSR8645 Amplifier Board is a compact dual-channel stereo receiver amplifier module delivering 5W+5W RMS output with integrated APT-X audio codec support for superior wireless audio quality. Audio engineers, DIY enthusiasts, and embedded systems developers use this module to build wireless speaker systems, portable audio devices, and IoT-enabled sound solutions with minimal component count. This product solves the critical challenge of integrating high-fidelity Bluetooth audio reception with Class D amplification in space-constrained applications while maintaining low power consumption and excellent audio clarity.\u003c\/p\u003e\n\n\u003ch2\u003eProduct Overview\u003c\/h2\u003e\n\n\u003cp\u003eThe CSR8645 chipset represents Broadcom's advanced Bluetooth audio solution, combining a powerful Bluetooth 4.0 transceiver with integrated digital signal processing and stereo amplification capabilities. This module operates on a single 5V power supply and implements Class D amplification topology, which delivers exceptional efficiency with minimal heat generation compared to traditional linear amplifiers. The APT-X codec ensures lossless audio transmission at 352kbps, providing studio-quality sound reproduction that surpasses standard SBC Bluetooth audio codecs. The board features integrated filtering, protection circuits, and thermal management, making it production-ready for commercial and hobbyist applications alike.\u003c\/p\u003e\n\n\u003cp\u003eThe module's architecture eliminates the need for external Bluetooth stacks and complex audio processing chains, significantly reducing development time and bill-of-materials costs. The CSR8645 supports both A2DP (Advanced Audio Distribution Profile) and AVRCP (Audio Video Remote Control Profile), enabling seamless playback control from paired devices. With a typical operating range of 10-15 meters in open space and support for simultaneous connection of up to 7 Bluetooth devices, this amplifier board is ideal for multi-zone audio systems, wireless headphone amplifiers, and portable speaker designs. The low-noise design and integrated power management deliver clean audio output with THD+N below 1% at rated power.\u003c\/p\u003e\n\n\u003ch2\u003eKey Specifications\u003c\/h2\u003e\n\n\u003ctable\u003e\n\u003ctr\u003e\n\u003ctd\u003eSpecification\u003c\/td\u003e\n\u003ctd\u003eDetails\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eProduct Type\u003c\/td\u003e\n\u003ctd\u003eBluetooth 4.0 Stereo Receiver Amplifier Module\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eChipset\u003c\/td\u003e\n\u003ctd\u003eCSR8645 (Broadcom)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBluetooth Version\u003c\/td\u003e\n\u003ctd\u003eBluetooth 4.0 with BLE Support\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAudio Codec\u003c\/td\u003e\n\u003ctd\u003eAPT-X, SBC, MP3\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOutput Power\u003c\/td\u003e\n\u003ctd\u003e5W+5W RMS at 4 Ohms (10W Total)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAmplifier Class\u003c\/td\u003e\n\u003ctd\u003eClass D\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOperating Voltage\u003c\/td\u003e\n\u003ctd\u003e5V DC (USB Powered)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFrequency Response\u003c\/td\u003e\n\u003ctd\u003e20Hz to 20kHz\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTHD+N\u003c\/td\u003e\n\u003ctd\u003eLess than 1% at rated power\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSignal to Noise Ratio\u003c\/td\u003e\n\u003ctd\u003eGreater than 90dB\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBluetooth Range\u003c\/td\u003e\n\u003ctd\u003e10-15 meters (open space)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSimultaneous Connections\u003c\/td\u003e\n\u003ctd\u003eUp to 7 devices\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBoard Dimensions\u003c\/td\u003e\n\u003ctd\u003e85mm x 50mm x 20mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight\u003c\/td\u003e\n\u003ctd\u003eApproximately 45 grams\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOrigin\u003c\/td\u003e\n\u003ctd\u003eOriginal\/Authentic\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWarranty\u003c\/td\u003e\n\u003ctd\u003e7 days on manufacturing defects\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eShipping\u003c\/td\u003e\n\u003ctd\u003e1-5 days from Bengaluru\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDelivery\u003c\/td\u003e\n\u003ctd\u003e7-8 days across India\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSupport\u003c\/td\u003e\n\u003ctd\u003e24\/7 via Email and WhatsApp\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\n\u003ch2\u003eKey Features\u003c\/h2\u003e\n\n\u003cul\u003e\n\u003cli\u003eCSR8645 Chipset: Integrated Bluetooth 4.0 transceiver with built-in DSP eliminates need for external Bluetooth modules and separate audio processors\u003c\/li\u003e\n\u003cli\u003eDual-Channel Stereo Amplification: 5W+5W Class D amplifier delivers 10W total output with exceptional efficiency and minimal thermal dissipation for compact enclosures\u003c\/li\u003e\n\u003cli\u003eAPT-X Audio Codec Support: Lossless wireless audio transmission at 352kbps ensures studio-quality sound reproduction superior to standard SBC codec\u003c\/li\u003e\n\u003cli\u003eSingle 5V Power Supply: USB-powered operation simplifies integration into portable devices, eliminating need for complex multi-voltage power management\u003c\/li\u003e\n\u003cli\u003eLow Noise Design: Signal-to-noise ratio exceeding 90dB and THD+N below 1% ensures clean, distortion-free audio output across entire frequency spectrum\u003c\/li\u003e\n\u003cli\u003eIntegrated Protection Circuits: Thermal shutdown, overcurrent protection, and DC offset detection safeguard connected speakers and amplifier components\u003c\/li\u003e\n\u003cli\u003eMulti-Device Support: Simultaneous pairing with up to 7 Bluetooth devices enables flexible switching and multi-room audio configurations\u003c\/li\u003e\n\u003cli\u003eCompact Form Factor: 85mm x 50mm footprint fits into space-constrained applications while maintaining full functionality and audio quality\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eApplications and Use Cases\u003c\/h2\u003e\n\n\u003cul\u003e\n\u003cli\u003eWireless Speaker Systems: Build portable Bluetooth speakers with high-fidelity audio output using this all-in-one receiver-amplifier solution for consumer audio products\u003c\/li\u003e\n\u003cli\u003eCar Audio Integration: Retrofit existing automotive audio systems with Bluetooth connectivity and amplified output for seamless smartphone music streaming in vehicles\u003c\/li\u003e\n\u003cli\u003eHome Audio Amplification: Create wireless multi-room audio systems by connecting this module to existing passive speakers in living rooms, bedrooms, and outdoor spaces\u003c\/li\u003e\n\u003cli\u003eHeadphone Amplifiers: Design portable headphone amplifiers with Bluetooth input and Class D amplification for audiophile-grade listening experiences on mobile devices\u003c\/li\u003e\n\u003cli\u003eIoT Audio Devices: Integrate into smart home speakers, voice-controlled audio systems, and IoT devices requiring low-power wireless audio reception and amplification\u003c\/li\u003e\n\u003cli\u003eDIY Audio Projects: Hobbyist and maker projects including Bluetooth-enabled guitar amplifiers, vintage radio retrofits, and custom audio installations\u003c\/li\u003e\n\u003cli\u003eCommercial Audio Solutions: Professional installations in restaurants, retail stores, and hospitality venues requiring wireless audio distribution with minimal infrastructure\u003c\/li\u003e\n\u003cli\u003eMedical and Industrial Equipment: Audio feedback systems in medical devices and industrial monitoring equipment requiring reliable Bluetooth connectivity and amplified output\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eHow to Use\u003c\/h2\u003e\n\n\u003cp\u003eBegin by connecting the module to a 5V DC power source through the USB connector or dedicated power pins on the board. Ensure proper speaker connections to the left and right amplifier outputs, using 4-8 ohm speakers rated for minimum 5W continuous power handling. The module enters pairing mode automatically on first power-up; use your Bluetooth-enabled device (smartphone, tablet, or computer) to scan for available devices and select the CSR8645 module from the Bluetooth settings. Once paired, the module will automatically reconnect to previously paired devices when powered on, establishing audio streaming within 2-3 seconds.\u003c\/p\u003e\n\n\u003cp\u003eFor optimal audio quality, enable APT-X codec in your source device settings if available, as this provides lossless audio transmission superior to standard SBC codec. Position the module within 10-15 meters of your Bluetooth source device to maintain stable connection and minimize audio dropouts. The integrated thermal management system operates silently without active cooling; however, ensure adequate ventilation around the board during extended use at maximum volume. For advanced applications, the module supports AVRCP commands, allowing volume control and track navigation directly from compatible Bluetooth remotes or headset controls. If experiencing connection issues, perform a factory reset by holding the reset button for 10 seconds, which clears all paired devices and returns the module to initial pairing mode.\u003c\/p\u003e\n\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\n\u003cdetails\u003e\n\u003csummary\u003eWhat is the difference between APT-X and SBC audio codecs on this module?\u003c\/summary\u003e\n\u003cp\u003eAPT-X is a proprietary lossless audio codec that transmits audio at 352kbps with minimal compression, delivering near-CD quality sound reproduction. SBC (Subband Coding) is the standard Bluetooth codec that uses higher compression ratios, resulting in noticeable audio quality loss. The CSR8645 module supports both codecs; when connected to APT-X capable devices, it automatically selects APT-X for superior audio fidelity. Devices without APT-X support automatically fall back to SBC codec without manual intervention.\u003c\/p\u003e\n\u003c\/details\u003e\n\n\u003cdetails\u003e\n\u003csummary\u003eCan I connect multiple speakers to this amplifier board simultaneously?\u003c\/summary\u003e\n\u003cp\u003eThe module provides two independent amplifier channels (left and right stereo), each capable of driving one 4-8 ohm speaker at 5W maximum. You cannot directly connect multiple speakers to a single channel without a speaker selector switch or impedance matching transformer, as this would reduce output impedance and potentially damage the amplifier. However, you can use passive speaker crossovers or active multi-amplifier configurations to drive multiple speakers from a single stereo source.\u003c\/p\u003e\n\u003c\/details\u003e\n\n\u003cdetails\u003e\n\u003csummary\u003eWhat is the maximum Bluetooth range and how can I improve connectivity?\u003c\/summary\u003e\n\u003cp\u003eThe CSR8645 module has a typical operating range of 10-15 meters in open space with clear line-of-sight to the Bluetooth source device. Range decreases significantly through walls, metal structures, and other obstacles due to RF signal attenuation. To improve connectivity, position the module in elevated locations away from metal objects, minimize distance to source devices, and avoid operating near 2.4GHz microwave ovens or WiFi routers that cause interference on the same frequency band.\u003c\/p\u003e\n\u003c\/details\u003e\n\n\u003cdetails\u003e\n\u003csummary\u003eIs this module suitable for battery-powered portable applications?\u003c\/summary\u003e\n\u003cp\u003eYes, the module is excellent for portable applications. It operates on a single 5V supply and draws approximately 200-300mA during playback at moderate volume, making it compatible with standard USB power banks and battery packs. For extended battery life, consider using a 5V lithium polymer battery with capacity of 2000-5000mAh, which provides 6-20 hours of continuous operation depending on volume levels and battery capacity.\u003c\/p\u003e\n\u003c\/details\u003e\n\n\u003cdetails\u003e\n\u003csummary\u003eWhen will I receive my order?\u003c\/summary\u003e\n\u003cp\u003eOrders are dispatched within 1-5 business days from our Bengaluru warehouse. Delivery takes 7-8 days to most locations across India.\u003c\/p\u003e\n\u003c\/details\u003e\n\n\u003cdetails\u003e\n\u003csummary\u003eWhat is your return and warranty policy?\u003c\/summary\u003e\n\u003cp\u003eWe offer a 7-day return policy on manufacturing defects only. Contact support within 7 days of receipt for free replacement or full refund. Not applicable for user damage or misuse.\u003c\/p\u003e\n\u003c\/details\u003e\n\n\u003cdetails\u003e\n\u003csummary\u003eAre bulk discounts available?\u003c\/summary\u003e\n\u003cp\u003eYes, wholesale pricing for orders of 10 or more units. Contact our sales team via WhatsApp or email for a customized bulk quote.\u003c\/p\u003e\n\u003c\/details\u003e\n\n\u003ch2\u003eWhy Buy from The Engineer Store\u003c\/h2\u003e\n\n\u003cul\u003e\n\u003cli\u003eGenuine Products: Sourced directly from authorized distributors with authentication\u003c\/li\u003e\n\u003cli\u003eExpert Team: Our technical team validates every product before listing\u003c\/li\u003e\n\u003cli\u003eFast Shipping: Dispatched within 1-5 days from our Bengaluru warehouse\u003c\/li\u003e\n\u003cli\u003ePan-India Delivery: 7-8 days to Mumbai, Delhi, Chennai, Hyderabad, Pune, Kolkata\u003c\/li\u003e\n\u003cli\u003ePayment Options: COD, UPI,\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eBuy Bluetooth 4.0 CSR8645 Amplifier Board 5W+5W APT-X Stereo Receiver Amp Module Online in India\u003c\/h2\u003e\n\u003cp\u003ePurchase the \u003cstrong\u003eBluetooth 4.0 CSR8645 Amplifier Board 5W+5W APT-X Stereo Receiver Amp Module\u003c\/strong\u003e online at \u003ca href=\"https:\/\/theengineerstore.in\"\u003eThe Engineer Store\u003c\/a\u003e, India's trusted source for genuine electronics. We deliver across Bengaluru, Mumbai, Delhi, Chennai, Hyderabad, Pune, Kolkata, Ahmedabad, Jaipur, and Surat.\u003c\/p\u003e\n\u003cp\u003eOur team in Bengaluru is available 24\/7 to support your journey from product selection to project completion.\u003c\/p\u003e","brand":"My Store","offers":[{"title":"Default Title","offer_id":43859600572579,"sku":"TES-EV010229","price":1226.42,"currency_code":"INR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0628\/4479\/7091\/products\/BE-01-1372-250x250.jpg?v=1704354479","url":"https:\/\/www.theengineerstore.in\/zh-hant\/products\/bluetooth-4-0-csr8645-amplifier-board-5w-5w-apt-x-stereo-receiver-amp-module","provider":"The Engineer Store","version":"1.0","type":"link"}