B5 ES9038Q2M Bluetooth DAC Headphone Amp (B5c with QCC5125 BT5.1 & 2pcs OPA1612) + B5 Remote Control

B5 ES9038Q2M Bluetooth DAC Headphone Amp (B5c with QCC5125 BT5.1 & 2pcs OPA1612) + B5 Remote Control

B5C Version:
* Chipset: Single ES9038Q2M
* Bluetooth: 5.1 (QCC5125)
* Output: RCA / 3.5mm headphone jack
* Input: Bluetooth / USB / Optical / Coaxial
* Includes: Bluetooth antenna and power adapter
* Not included: Signal cables and display screen
* Features two OPA1612 op-amps and Taiwan Taitien crystal oscillator which can by replaced by gold-plated crystal oscillator

Advantages of the B5 Series:
* Supports Remote Control: It allows long-distance control of volume, input switching, and power on/off
* Socketed Op-Amp Design: Pre-installed IC sockets allow op-amp replacement without soldering (unlike designs without sockets that require soldering).
* Type-C 5V Power Supply: Highly compatible. It supports standard phone chargers for Android.
* Dual ± Voltage Supply for Op-Amps: This provides proper power to maximize op-amp performance, as single-voltage circuits tend to underperform.
* High 12V Supply for Op-Amps: It unleashes the full potential of op-amps (many only use 9V).
* Software-Controlled Power On/Off: It prevents speaker pop noises; supports a remote control to turn on/off and adjust volume (mechanical toggles are cheaper but more prone to wear).
* Clean Front Panel Design: No visible screws on the front — much more refined and three times more costly than screw-fixed panels.
* Independent Linear Power Supply (LDO) Circuit: It provides clean and stable power for the ES9038Q2M DAC chip (often omitted in cost-cutting designs).
* Bluetooth Chip: The audio decoder uses QCC5125 (Bluetooth 5.1) or QCC3084 (Bluetooth 5.4). It supports mainstream Bluetooth modes and is for LDAC, aptX HD, etc.

B5 Use Cases:
* Use a mobile phone as a player, transmit audio via Bluetooth to the decoder, and convert it to RCA output for the amplifier.
* For TV sound, transmit it via coaxial cable to the decoder, and convert it to 3.5mm output for powered speakers.
* For computer sound, transmit it via USB cable to the decoder, using it as an external sound card for the computer.
* For set-top boxes, transmit audio via optical cable to the decoder, and connect it to a 2-channel home theater system.

Features:
Input Interface
* The decoder uses either a QCC5125 Bluetooth 5.1 chip or a QCC3084 Bluetooth 5.4 chip.
* USB supports connection to a computer as an external sound card (cannot connect to a phone via USB).
* Multiple input channels: It supports USB, Bluetooth, optical, and coaxial inputs.
* Equipped with a volume control knob, it can be used as a preamplifier.

Filtering Operational Amplifier
* It uses an active LPF and I/V conversion design. Compared to passive RC (resistor-capacitor) structures, this design better improves the system's audio response speed, resulting in lower signal distortion and more dynamic, powerful music.

Four Dual Op-Amps
* The internal board reserves IC sockets, so swapping op-amps no longer requires soldering. You can plug and replace different op-amps to match various music styles, offering more flexibility and fun.

Microcontroller Software Control
* The decoder uses a microcontroller (MCU) solution. The software control optimizes the performance of the ES9038Q2M chip. It is rare at this price point to achieve automatic recognition of input signals via panel button power on/off and employs pop elimination technology.
* Pop resolution: Track switching, fast-forwarding, sample rate changes, etc., are all handled by MCU software control.

Output Protection
* It uses an original HF relay with a delayed power-on engagement and immediate power-off.
* Shock prevention: This avoids popping noises during power-on and power-off, protecting the speakers from damage.

ES9038Q2M Decoding
* The decoder adopts the ES9038Q2M decoding solution. This chip features a 32-bit/384kHz DAC architecture and time-domain jitter elimination technology, with a dynamic range of 129dB and distortion of -120dB. It is a rare high-performance DAC chip in the industry today, providing transparent sound, high density, and rich detail.

Signal Pass-Through
* It disables volume control to maintain a direct output level, minimizing signal interference and delivering more authentic sound.

Internal Components
* Original LPF Filter Capacitors for WIMA: Used for low-pass filtering.
* HF Relay: It prevents power-on/off popping noises.
* Four Dual Op-Amps: They support active LPF and I/V conversion; op-amps are socketed for easy swapping.
* Optical and Coaxial Inputs: 192kHz / 24-bit sampling rate.
* Smart Software Control Chip: Eliminates popping sounds via intelligent processing.
* Optional BT Capacitors for Nichicon: Used for ±12V power supply filtering.
* Volume Knob: Short press to switch input channels.
* 3.5mm Analog Output: Can connect to active speakers and earphones.
* Chip-Level Negative Voltage Circuit: It provides dual voltage (positive and negative) to op-amps.
* LDO Power Supply: Three AMS1117 regulators deliver independent, low-noise, high-PSRR (Power Supply Rejection Ratio) power to chips.

Specifications:
* Dimensions: 126mm (Length) × 95mm (Width) × 30mm (Height)
* Weight: 260g
* External Power Supply: 5V / 2A (Type-C socket, can connect to computer)
* Digital Input Ports: Bluetooth 5.1 or 5.4, Optical, Coaxial, USB sound card
* Analog Output Ports: 3.5mm / RCA (Output level: 2Vrms)
* Bluetooth Specifications: For LDAC, aptX-LL, aptX-HD, SBC, AAC
* USB Sound Card Specifications: 44.1–96kHz / 24-bit
* Coaxial Input Specifications: 44.1–192kHz / 16–24 bit
* Optical Input Specifications: 44.1–192kHz / 16–24 bit
* Power Consumption: 5W (Standby < 0.1W)

Attention:
* Features for LDAC and aptX require phone support.

Packing List:
* 1 x Main Unit
* 1 x 3dBi Bluetooth Antenna
* 1 x 5V Power Adapter
* 1 x Product Certificate of Conformity
* 1 x Warranty Card
* 1 x Remote Control

Packaging Details:
* Weight: 0.55kg