Leaf Audio PA-04 Fully Balanced HiFi Class A Remote Control Preamplifier R2R Relay Volume Control

Features:
- Equipped with remote control, relay R2R volume control, without distortion issues.
- Treble and bass adjustment ±16dB (can be completely turned off).
- Fully balanced amplification, even treble and bass adjustments are balanced control.
- Three adjustable gains.
- Four sets of inputs (2 balanced + 2 single-ended).
- VU mechanical meter header design, flexible and smooth.
- 100VA high-power transformer, with sufficient energy and tension in sound.
- All aluminum casing, rust free.
- Ultimate performance indicators, frequency response of 10-200KHZ, full frequency distortion below 0.0002%.

Specifications:
- Product size: 430 x 230 x 73mm
- SNR:
  RCA: 120dB, 2V RMS OUT, G=1
  XLR: 128dB, 4V RMS OUT, G=1
  RCA: 128dB, 16V RMS OUT, G=8
  XLR: 138dB, 32V RMS OUT, G=8
- THD+N:
  RCA: 0.0003%, 2V RMS OUT, G=1
  XLR: 0.00015%, 4V RMS OUT, G=1
  RCA: 0.001%, 16V RMS OUT, G=8
  XLR: 0.0005%, 32V RMS OUT, G=8
- Intermodulation distortion: 0.0002%, 1kHz
- Output impedance: 100ohm for RCA, 200ohm for XLR
- Input impedance: 47Kohm for RCA, 47Kohm for XLR
- Frequency response: 5Hz - 200kHz±0.5dB
- Treble and bass adjustment range: ±16dB
- Gain select: 1X, 4X, 8X
- Working voltage: 110V/220V (optional)
- Quiescent dissipation: 23W

Details:
- Unconventionally using a 100W high-power transformer, with sufficient air supply and accurate sound, without the need for a shielding cover or any current noise.
- The volume adjustment circuit uses high-quality relays for Omron, paired with imported wafer resistors for VISHAY and relay R2R resistor array volume control circuit.
- Large capacitor filter, two channel uV level independent linear regulator circuit, high-performance, low distortion guarantee.
- Four-channel balanced amplification, HiFi dedicated power tube output, high output current, high swing amplitude, and sufficient force.
- MCU + motor volume potentiometer controls the relay to adjust the volume, and the sound quality is lossless. (*Note: this potentiometer does not directly control the volume, but controls the output level of the MCU to drive different relays to open and close to achieve the purpose of controlling the volume. There will be no problem of biased sound or poor contact noise over time.)
- Four channel independent amplification, four layer circuit board design, high-quality components, creating high performance.

Package Included:
- 1 x Preamplifier