Robson HA1

Robson HA1

Years of research into a dedicated headphone amplifier which can drive the most difficult of loads with ease has culminated into a design based around the most dynamic amplifier modules in their class. 

A dual mono design throughout using N-core technology and fully balanced with our own pre-amp internal buffer stage and a 4 pole Swiss Alps volume control. 

Internal wiring uses Duelund Coherent Audio copper and cotton in oil wire for input signal path and Harmonic Technology UP-OCC wire for output signal path. 

The HA1 headphone amplifier has been primarily designed to perfectly match the incredible HiFiMan Susvara and HE100se headphones along with matching headphone cables specifically deigned for each headphone and available as a package deal.

HA1 features

  • N-core technology, dual mono design
  • Specific high quality internal wiring
  • Fully balanced with switchable un-balanced
  • 4 pole balanced Alps volume control
  • Same form factor as the MV3, SA1 and MC1 amplifiers

Please enquire about Burr hardwood front panel options.

PRICE -  HA1 - £1800.00

PRICE - HA1 + HiFiMan Susvara + 3m cable - £5500.00

PRICE - HA1 + HiFiMan HE1000se + 3m cable - £3800.00 


Output power 4W RMS into 30 ohms ohms 

2.5W RMS into 60 ohms 

Class of operation Class D
Minimum load 4 ohms
Frequency response and Distortion  10Hz to 50kHz @  0.0015%
Signal to noise ratio 121dB
Output impedance 1.5 mohms
Peak output current 12 amperes
Damping factor >1000
Power consumption 350W
Input voltage 240V/50Hz
Output connectors Silver plated 4 pin XLR or 6.3mm jack
Input connectors True Balanced  XLR or unbalanced RCA
Input impedance 47Kohms
Size 240W x 320D x 115H (mm)
Weight 5Kg

Robson HA1 - Image Gallery