PA-05 Fully Balanced 10Wx2 Headphone Amplifier for HD800/Arya/HE1000/NAN7 Headphones (for Mundorf Capacitor)

PA-05 Fully Balanced 10Wx2 Headphone Amplifier for HD800/Arya/HE1000/NAN7 Headphones (for Mundorf Capacitor)

Improvements:
- Adjusted circuit parameters, added high-frequency response, and created a certain horizontal sound field.
- Changed the feedback to a pure DC circuit to improve the low-frequency response speed.
- Adjusted the voltage regulator circuit to reduce the internal resistance and ripple of the power supply.

Features:
- True balance, four preamplifiers + four power amplifiers + 4-layer PCB circuit board, 4-channel balance potentiometer.
- Original imported high-quality transformer.
- Balanced four-way amplifier circuit, consisting of 12 sets of fully discrete JFET input amplifier modules for Toshiba, with good linearity and high power. There is no operational amplifier involved in the signal amplification circuit of the whole machine.
- The headphone amplifier also has a preamplifier circuit as a buffer to enhance transparency and sound field.
- Standard configuration includes a Japanese imported blue shell 4-cell balancing potentiometer for ALPS.
- Equipped with front-end RCA and XLR output functions.
- Equipped with RCA and XLR inputs (RCA input uses discrete module conversion balance instead of operational amplifier).
- Two levels of high and low gain adjustable (18dB and 12dB).
- Three headphone output interfaces: 4.4, 6.35, XLR 4-core.
- Four layer circuit board design, low noise, low distortion.
- 360mm wide x 240mm deep x 55mm high, all aluminum chassis.
- The maximum output undistorted voltage of the balanced port is 30VRMS, which is good news for 1-2KΩ high impedance headphones.
- The output internal resistance is as low as 0.5Ω.
- A large number of imported HiFi components, RCA gold-plated interfaces.
- The zero potential adjustment circuit of the output port ensures that the output DC voltage is always below 1mV, and there will be no annoying clicking sound when inserting the earphones, protecting the delicate tablet earphones from the commonly referred "dry burning".
- Overcurrent, output DC, and delayed output protection (startup delay of 12 seconds).
- The working voltage is ±24-28V, higher than the common ±15-18V, with a larger dynamic range and strong output power.
- The power output is 8 medium power transistors, and the output current is more than enough for milliwatt level headphones. The sound is pure and durable, without hair or dryness.

Precaution:
- The front-end module of this machine is in Class A status, and the overall heating is a normal phenomenon.
- Before turning on the power, unplug and plug in various input signal cables and headphones, please lower the volume first to prevent excessive volume from burning out the headphones.
- If the transformer makes a vibration sound, please purify the mains power supply first (isolate it from DC to eliminate interference).
- Do not connect speakers or headphones with an impedance lower than 4ohms.
- The mains power supply must be grounded, otherwise there may be interference sounds, manifested as the disappearance of noise when touching the casing.
- Stacking machinery and equipment may cause electromagnetic interference, resulting in electrical noise.
- When using as a preamplifier, do not insert headphones into the headphone hole or turn down the volume before starting the machine.
- The device comes with a pre-amp, so there is no need to add another pre-amp, as it may increase distortion and affect the listening experience.
- Due to the high output power of this device, it is best to lower the volume when turning it on and off. Especially for tablet headphones, caution should be taken to prevent excessive sound from burning out the headphones. Our store is not responsible for any damage to the headphones caused by improper use (such as excessive volume, unplugging and plugging the input signal line at high volume, or using the tablet headphones as small speakers when empty)

Specification:
- Product size: 360 x 240 x 55mm
- Headphone port output power:
  6.35mm interface: 2.5W/32ohms, 0.75W/300ohms
  4.4mm balanced interface: 10W/32ohms; 3W/300ohms
  XLR balanced interface: 10W/32ohms, 3W/300ohms
- SNR:
  Pre-amp output: -110dB for RCA; -111dB at 2V for XLR
  Headphone output: -105dB for 6.35mm; -108dB at 0.5W for XLR
- Distortion:
  Pre-amp output: 0.0002%, RCA & XLR
  Headphone amplifier output: 0.0004% at 7W
- Frequency response: 8Hz - 100kHz
- Working voltage: 110V/220V
- Static power consumption: 23W
- Maximum power consumption: 85W

Package Included:
- 1 x Headphone Amplifier