Similar to the M177 except with an adjustable Polar Pattern, the M179 features a dual sided, externally biased capsule with a gold sputtered 1.1" diaphragm. The M179 has a high speed, low noise operational amplifier head amp, coupled with a new discrete high efficiency power supply circuit. This results in incredibly low noise, low distortion and fast transient response. The M179 will even work with 24-volt phantom supplies! The M179 also features a non-capacitive 20 dB pad switch and an 80 Hz high-pass filter.