Type: Ture condenser pressure gradient microphone with 1 in (25 mm) diameter dual diaphragms and vacuum tube preamplifier Vacuum tube:6072(selected from 12AT7) Capsule capacitance:50pf Polar pattern:Omnidirectional,cardioid,figure 8, and six intermediate stages(silent switching) Open circuit sensitivity @1KHz:-36dBV(0dBV=1V/Pa)for all patterns Frequency range:20 to 20,000 Hz Rated output impedance:<200 ohms Recommended load impedance:>1000 ohms Max.SPL(1% THD @1000hz):134 dB S/N ratio re 1Pa:74dB Dynamic range (max SPL to A-weighted noise level):116dB Ambient temperature range:140F to 1400F(-100C +600C) Relative humidity range:90% (680F,200C),85%(1400F,600C) Connector:7-pin XLR (gold plated) Mic cable:7-pin XLR cable (XC-7P),30 ft (10 m) Dimensions:Diameter:2.36 in(60 mm),length:7.1 in (180 mm) Net weight:29 oz(800 g) Power requirement:dedicated powering unit (115/230vac selectable) Dimensions:2"x5.5"x7"(51 mm x140 mm x178 mm) Weight:3.25 1bs (1.46 kg).