Musical Fidelity MX-HPA - fully balanced headphone amp Class A
May 15, 2015 at 9:03 AM Thread Starter Post #1 of 1


100+ Head-Fier
Apr 1, 2013
Plan to have a listen soon. Always liked the MF stereo stuff (the big amps) and MF has been creating headphone amps longer than most companies. Hopefully MF adds more detailed info regarding power output on other headphone loads.
MX-HPA - Overview
The incredible studio reference MX HPA fully balanced headphone amp has been a labour of love for everybody at Musical Fidelity. As some of you may have noticed we have been making headphones for some time and have always been great headphone fans. Although the M1 HPA is very good we wanted to make something which was incredible.
The MX HPA fully balanced headphone amp is the result of decades of experience of making high quality headphone amplifiers. Relatively, the MX HPA has about the same performance into headphones as the incredible Titan has into loudspeakers. That is; awe inspiring, incredible, limitless and any other hyperbole you can imagine. It is really incredible.
MX-HPA - Design and Build
The MX HPA’s technical performance is stunning.  Typically distortion from 20 Hz to 40 kHz is less than 0.005%.  This is serious stuff.  Signal noise ratio is better than 120dB (‘A’ weighted).  Needless to say frequency response is ruler flat from 10 Hz to 20 kHz (-0.1dB). 
It is capable of a short term peak of 10 watts (for one cycle).  It has 2 gain positions; 18dB (8X) and 24dB (15X).  Inputs are either balanced or single ended.  It will automatically convert single ended inputs to balanced. The MX HPA is genuinely fully balanced from beginning to end.

MX-HPA - Specifications
Power 1.8 Watts per channel into 8 Ohms (27dBW)
Maximum output voltage 19 Volts RMS, 20Hz to 20 kHz
Onset of clipping (54 Volts peak-to-peak) balanced
Line input
THD+N >0.005% typical, 20Hz to 20 kHz
Signal / noise ratio >120dB ‘A’-weighted
Input impedance 50k Ohms
Frequency response +0, –0.1dB, 10Hz to 20 kHz
Gain, LO position (volume max) 18db (8x)
Gain, HI position (volume max) 24dB (15x)
Line level inputs
1 pair line level XLR (balanced) connectors
1 pairs line level RCA connectors
Headphone outputs
1 pair 3-pin XLR/¼” stereo Jack combined sockets
Power requirement
Mains voltages 90-250VAC 50-60Hz universal worldwide supply
Consumption >0.25 Watts standby (Orange LED lit)
15 Watts maximum (Blue LED lit, full power output)
Unit only, unboxed 2.2 kg (5 lbs) In shipping carton 3.7 kg (8¼ lbs)
Width 220 mm (8⅔”)
Height (including feet) 53 mm (2”)
Depth (front to back) inc. terminals 240 mm (9½”)
Hi-Fi News Measured specs
Maximum output (re. 1% THD into 47kohm) 9.3V
Max. power output (re. 1% THD into 25ohm) 1215mW
Output Impedance (20Hz-20kHz) 3.58-4.05ohm
Maximum gain +13.7dB (High gain mode)
A-wtd S/N ratio (re. 0dBV) 98.6dB
Frequency response (20Hz-20kHz/25ohm) +0.00dB to –0.33dB
Distortion (20Hz-20kHz, re. 40mW) 0.00035–0.0065%
Hi-Fi News Review
Revistaonoff Review (Spanish)
HiFi test (German)




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