YJCO HiFi Amplifier Audiophile TPA3116 BT5.4 PCM5102 NE5532 USB TF AUX FLAC 100W×2 4Ω DC18-24V Home Digital Audio Amp D100U

D100U User Guidelines:1. This amplifier only supports passive speakers on its output ports. Do NOT connect active speakers or constant-voltage loudspeakers.2. The amplifier runs on DC 18V–24V power supply. Output power rises with voltage, yet the input voltage must never exceed 24V; exceeding the limit will permanently damage the amplifier. The DC power plug is 5.5×2.1 mm, configured as center-positive, sleeve-negative.3. Bluetooth device name: YJCO. The amplifier automatically switches to Bluetooth input once paired with a cellphone. You can also manually switch to Bluetooth mode using the MODE button on the front panel.4. USB flash drives and TF memory cards must be formatted to the FAT32 file system, otherwise the amplifier cannot read the storage devices. If your drive uses another format, reformat it to FAT32 on a computer with Disk Genius before copying music files.5. The EQ button on the remote cycles through multiple sound profiles, including Standard, Jazz, Pop and Classical.6. The numeric buttons on the remote enable direct track selection during USB/TF card playback. For instance, tapping the number “2” three times jumps straight to Track 222. This rule applies to all track numbers.7. Never connect the negative terminals of the left and right channel outputs together. Shorting these terminals will burn out the amplifier hardware.Specifications:Model: D100UInput Options: AUX, USB Flash Drive, TF Card, Bluetooth (BT)Output Connector: Crystal Screw Terminal BlockDAC Decoding Chip: PCM5102Main Control Chip: JieLi ChipPower Amplifier Chip: 2 × TPA3116Bluetooth Version: Bluetooth 5.4Frequency Response: 20 Hz – 20 kHzOperational Amplifier Chip: 2 × NE5532Supported Bluetooth Codecs: SBC / AAC, 16 Bit, 44.1 kHz ~ 48 kHzUSB / TF Card Supported Audio Formats: PCM 16bit (44.1kHz~48kHz), MP3, AAC, APE, FLAC, WAVOperating Power Input: DC 18V – 24VOutput Power: 100W × 2 @ 4 Ohms (Tested at 24V input)Total Harmonic Distortion (THD): 0.2%Signal-to-Noise Ratio (SNR): 90 dBBluetooth Effective Transmission Distance: 10 metersOverall Dimensions: 130mm × 128mm × 35mmNet Weight: 460 gDC Power Jack Size: 5.5 mm outer diameter / 2.1 mm inner diameter