Shure Inc KSM44: multipattern condenser microphone features externally biased large dual diaphragms in a side-address design; offers extended frequency response of 20Hz to 20kHz; contains Class A, transformerless preamplifier circuitry; dual one-inch, gold-layered, Mylar diaphragms provide added low frequency response, while improving environmental stability; the diaphragms' thin design reproduces any sound source and achieves a self-noise of 7dB; 800-25-SHURE; 847-866-2200; fax: 847-866-2279;