Black HPA-A1000 MK3 Balanced Headphone Amplifier Relay Volume Control OLED HD Screen Preamplifier

Black HPA-A1000 MK3 Balanced Headphone Amplifier Relay Volume Control OLED HD Screen Preamplifier

Key Features:
- 3 sealed ring transformers for TALEMA (2 x amplification circuits, 1 x control circuit).
- The left and right channels are fully independently powered, with a 160000uF large electrolysis filter.
- Discrete voltage regulator power supply.
- 128 level relay volume control, large screen OLED dynamic display.
- Relay controls 3 analog stereo inputs (1 XLR, 2 RCA).
- 2 analog stereo line outputs (1 XLR, 1 RCA).
- Full DC amplifier circuit, accurately reproduces signals.
- 4-channel high-power (7W/50ohms), high swing voltage (32VRMS/600ohms), BTL balanced amplification.
- Full function headphone output port (1 x 4-core XLR, 2 x 3-core XLR, 2 x TRS, 1 x 4.4mm).
- Headphone amplifier output, independent control of front-end output, independent adjustment of gain, direct volume of front-end output.
- Full function protection circuit (overvoltage, overcurrent, zero drift, delayed output).
- Optional remote control (input/output selection, volume control, mute).

Mechanical Parameter:
- Material: 15mm and 5mm (thickness) anodized aluminum for front panel and back panel; 15mm (thickness) aluminum profile heat dissipation ribs (8mm baseboard + 7mm heat dissipation ribs; 4mm anodized aluminum for upper and lower plate
- Chassis size: 398 x 295 x 72mm
- Net weight: 7.6kg

Configuration:
- Input op amp: OP01-BP discrete op amp x 4
- Volume buffering: OP01-BP discrete op amp x 2
- Headphone amplifier gain: NE5532AP integrated op amp x 2
- Preamplifier output: LME49720NA integrated op amp 2 x 2
- Headphone amplifier output: LME49990MAX integrated op amp x 4
- Regulated power supply: PW03-DD discrete power supply
- Note: the op amp power supply voltage of this machine is ±18V. If you need to replace the operational amplifier yourself, please confirm whether the withstand voltage meets the requirements first.

Technical Parameter:
Input Parameter:
- Stereo analog input interface: 1 x XLR female (balanced input); 2 x RCA (single-end input)
- Maximum input voltage: +21dBu (about 9.75V RMS)
- Input impedance: 10kohms

Line Output Parameter:
- Stereo analog line output interface: 1 x XLR male (balanced output); 1 x RCA (single-end output)
- Line output gain: -12/-6/0/+6/+12 dBr
- Maximum output voltage: +21dBu (about 9.75V RMS)
- Output impedance: < 1ohm

Headphone Amplifier Parameter:
- Nominal input sensitivity: +6dBu (about 1.55V RMS)
- Amplifier gain: -4dB for RCA; +2dB for XLR
- Pre-gain: -15/-12/-6/0/+6/+12/+18/+24 dBr
- Frequency range: 5Hz - 250kHz (-0.5dB)
- Output impedance: 0.1ohm for unbalanced output; 0.2ohm for balanced output
- Damping factor, load of 50ohms: 500 for unbalcned output; 250 for balanced output
- Dynamic range: > 135dB (A-weighted)
- Noise: < -104dBu (A-weighted)
- THD+N:
  1kHz, 2 x 10V, 100ohms (1W): <-104dB/<0.00063%
  1kHz, 2 x 4V, 32ohms (0.5W): <-103dB/<0.00071%
- Crosstalk: -105dB for 1kHz; -103dB for 15kHz
- Headphone output interface: 1 x 4-Pin XLR; 1 x 4.4mm, 2 x 1/4” (6.3mm) headphone port; 2 x 3-Pin XLR headphone port (shared composite socket with 6.3mm TRS)

Maximum Output Level (1kHz, THD+N < 0.1%):
- 600ohms: 32.4V RMS, 1750mW
- 300ohms: 29.5V RMS, 2900mW
- 100ohms: 25.6V RMS, 6500mW
- 50ohms: 18.8V RMS, 7000mW
- 32ohms: 13.4V RMS, 5600mW
- 16ohms: 7.2V RMS, 3200mW
- 8ohms: 3.6V RMS, 1600mW
- 4ohms: 1.8V RMS, 820mW

Power Supply Parameters:
- Power supply voltage: AC 230V/115V (optional, default 230V)
- Maximum power consumption: 60VA

Performance:
Output power:
- Under low impedance loads (such as 50Ω), the output power can reach up to 7000mW (7W), indicating that the amplifier can drive most high impedance and low impedance headphones.
- Under high impedance loads (such as 600Ω), the output power is still very strong at 1750mW (1.75W).

Output voltage:
- Under a 600Ω load, the output voltage can reach up to 32.4VRMS, making it suitable for driving high impedance headphones.
- Under a 4Ω load, the output voltage is 1.8VRMS, which is suitable for driving low impedance headphones.

Applicability:
- This amplifier can adapt to headphones ranging from 4Ω to 600Ω, covering a wide range from low impedance in ear headphones to high impedance open headphones.

Summary:
- This is a high-performance headphone amplifier with extremely high output power (up to 7000mW) and wide load adaptability (4Ω to 600Ω).
- Its low distortion (THD+N <0.1%) and high output voltage (up to 32.4VRMS) enable it to drive various high impedance and low impedance headphones.
- The power supply design supports global voltage (115V/230V), with low power consumption (up to 50VA), suitable for long-term use.
- The mechanical design uses high-quality aluminum and steel plates, combining aesthetics and durability.
- This device is very suitable for professional audio engineers, enthusiasts, and users who have extremely high requirements for sound quality and driving capabilities.
- It is a high-performance headphone amplifier with extremely low noise, distortion, and output impedance, suitable for driving various high-sensitivity or high impedance headphones.
- Its wide gain adjustment range (-15dBr to +24dBr) and balanced/unbalanced input-output options make it suitable for a variety of audio devices and headphones.
- High dynamic range (>135dB) and low crosstalk (-105dB) ensure excellent sound quality performance, suitable for users with extremely high sound quality requirements.

Discrete Regulated Power Supply Module:
- Independent regulated power supply of left and right channel.
- 1PCS discrete regulated module of each channel
- Each module output positive and negative 2-channel power supply (default ±18V)
- Input PSRR: -124dB
- Output noise: 3.2uV RMS (20kHz at 5 Vo)
- Load regulation: 2mV
- Output current: 1020mA

For Nichicon UFW Series Audio Capacitors (3300uF x 20pcs, 2200uF x 44pcs):
- Parallel connection of multiple capacitors has the following advantages:
  1. Increase total capacity and transient response
  2. Reduce equivalent series resistance (ESR)
  3. Improve reliability and flexibility
  4. Disperse heat loss and improve stability

128 Levels Relay Volume Control (0-127):
1. For TE IM03 series signal relay: PdRu (palladium nail) + Au (gold) alloy contact, contact resistance < 50mohms
2. For VISHAY BC MMA series high-precision low-temperature drift film resistor:
  Resistance tolerance: ± 1%
  Temperature coefficient: ±25ppm/K
3. Large OLED high-definition display screen, real-time display of current volume value and working status

Relay Volume Control Advantages:
- High consistency of the audio channel, no channel imbalance problem in low volume state.
- Pure sound quality: Relays and resistor networks have little impact on the signal and can maintain high fidelity of the audio signal.
- Non contact noise: There is no mechanical contact during switching, avoiding the noise that may be generated by traditional potentiometers.
- High reliability: The relay has a long lifespan and is suitable for frequent operation.
- Precise control: By combining multiple relays, precise volume adjustment can be achieved.
- No wear and tear: no mechanical contact, stable long-term performance.

Package Included:
- 1 x Headphone Amplifier