AKG SolidTube Condenser Microphone Cardioid polar pattern Frequency range: 20Hz-20kHz Impedance: 200 ohms Maximum SPL for 3% THD: 130/145dB. This package includes an external power supply, spider suspension and windscreen in a metal carrying case Studio Mic The Solidtube features a large-diaphragm transducer and a familiar ECC 83 (12AX7) tube The Solidtube also provides a -20dB preattenuation pad for use on extremely loud sources such as guitar amplifiers, etc , and switchable bass cut and Ground Lift on the power supply