Coles Electroacoustics 4155

Notes: FLAG - very thin manufacturer documentation: the entire product page description is 'Very rugged case with sintered disk and can be used with different impedance capsules.' No spec PDF is published (unlike the 4038/4030L/4050/4104/4115, which all have downloadable datasheets). No frequency response, sensitivity, max SPL, dimensions, weight, or price are published anywhere on the manufacturer site. Topology is set to 'ribbon' by inference only, since Coles' entire microphone line is ribbon-based and this model sits under their 'ALL MICROPHONES' listing -- this is NOT explicitly confirmed on the product page and should be treated as a judgment call. Polar pattern left blank because the page explicitly notes it accepts 'different impedance capsules,' which could imply interchangeable elements rather than a single fixed pattern. The name 'Bus Microphone' is unexplained on the site; its intended application (public transit vs. broadcast 'OB bus' vs. other) is unconfirmed -- left blank rather than guessed.