The ARM-1S is an active, phantom powered, ribbon microphone with a short (1″) ribbon.

The HUM Audio Devices ARM-1 S is an active, phantom powered, ribbon microphone with a short (1″ / 25mm) ribbon.  The HUM ribbon has a huge, larger than life, sound with a lot of depth and detail and, at the same time, preserves the classic ribbon sound flavour so much beloved by musicians and engineers.

The ARM-1S is basically the same as the ARM-1L, the only difference being the length of the ribbon (1″ for the 1S and 2″ for the 1L).

The microphone has an integral swotchable high-pass filter: off / 100Hz / 50Hz (see picture).

The difference in sound:
ARM-1L is more contoured, great to add some character to the sound.
ARM-1S is smoother and tonally balanced.


ARM-1S (white suspension)
ribbon element:    1″ long (1.8µ aluminum foil)
polar pattern:    Figure-8
supply:    Phantom +48V (+/- 5V)
frequency response:    40Hz – 14kHz (+/-3dB)
sensitivity:    -39dB (1V/Pa)
max. SPL:    138dB
output impedance:    22Ω (electronic)
recommended load impedance:    150Ω or greater
HPF:    50Hz (6db/octave)
anti-vibration system: Dual (external shockmount and internal vibration  isolators)


Mic body
Length: 286.5mm
Diameter: 60mm (upper)
Spider external diameter:  126mm

Flight Case
Length:  320mm
Width:  230mm
Height:  155mm

User Manual

This is a new microphone – more details will be added here as they become available.