Dual Tube design, input tube is a 12AX7 and output tube is a 12AU7. Bass cut filter and -10db pad. Hand crafted true condenser capsule. 35mm gold/mylar diaphragm. Cardiod directional pattern. 20hz to 20khz frequency range with 35.48mV/Pa (-29db) sensitivity. 135/145 Max SPL and 75 db signal to noise ratio. 19 db self noise, 150hz pass filter switch, an -10db preattenuation pad. Dedicated power supply unit included THE GEMINI CONCEPT: DUAL-TUBE DESIGN -Most microphones use a transformer to optimize the mic's output impedance and couple the mic to the mic preamplifier. With the Gemini II, this optimization is accomplished with a second vacuum tube, negating any high-frequency rolloff typically incurred with a transformer. -This provides the Gemini II with a sparkling, pristine high-end typically only found in the most expensive solid-state microphones, while maintaining the rich, thick tonality of a tube mic. Not just for vocals, the bass cut filter and -10dB pad make the Gemini useful for loud and heavy sources like drum room mics and booming timpani. HANDCRAFTED CAPSULE & LARGER-THAN-LIFE SOUND: -The Gemini II has a 1 1/4” capsule that is handcrafted and individually tuned in our very own factory. -Thanks to a larger-than-life capsule, true condenser technology and ultra-precision parts, the Gemini II delivers a massive sound right out of the box. In addition, the Gemini II’s hand-made metal housing and gold-sputtered diaphragms, ensure maximum reliability in any and all sonic settings.