\u00abCardioid Tube Condenser Microphone.<\/p>\n
The Horch RM4 is a large-diaphragm tube condenser microphone inspired by the Neumann U 47. The RM in the model name comes from R\u00f6hrenmikrofon, the German word for tube microphone.<\/p>\n
The mic uses an ECC81 dual-triode tube in a class A amplifier circuit with a custom-wound nickel\/iron transformer said to be perfectly adapted to the tube.<\/p>\n
The tube\u2019s heater voltage is remotely controllable from the power supply. The Horch PSU is common to all the Horch mics; it has a pattern-control switch that on the RM4 controls the voltage to the tube rather than the relative polarity and gain of the capsule\u2019s diaphragms. By over- or under-driving the tube, the character of the mic\u2019s sound can be altered. Horch describes this feature as an ability to vary the microphone\u2019s saturation,compression, or dynamic range.<\/p>\n
The saturation of the tube is adjustable from a very clear to a high saturated and compressed sound.<\/p>\n
There is no risk of damaging the RM4\u2019s ECC81 tube, as the voltage change is within the tube\u2019s normal range of operation.<\/p>\n
Horch RM4 CapsuleThe capsule is a large-diaphragm design that appears to be modeled to some degree after the Neumann K47. It is a dual-diaphragm, center-terminated design like the K47. Photos suggest that the RM4 capsule shares a backplate drilling style with the K47, in that the outer holes are equidistant from the center (forming a circle).<\/p>\n
However, unlike the K47, the RM4 capsule is a dual-backplate design, and at 32mm outside diameter is slightly smaller than the K47.<\/p>\n
The diaphragms are made of a 4-micron film metallized with a thin coating of platinum. Platinum is said to be lighter and more resistant to corrosion than gold.<\/p>\n
Both front and back diaphragms appear to be wired, although the mic has a fixed Cardioid pickup pattern.<\/p>\n
The RM4 capsule is similar to the capsule of the RM2J. It is manufactured in Germany, presumably by Haun\/MBHO.
\n\u00ab<\/p>\n","protected":false},"excerpt":{"rendered":"
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