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Found 1 result

  1. 1. The Sennheiser MKH 70 and the Neumann KMR 82 (not the Sennheiser 804/805/815/816/415/416) have an essentially figure of 8 (bi-directional) pattern at low frequencies. So when outdoors if you point them straight up or down you can tune out typical exterior noise which comes along ground level (this technique is useless for airplanes and such). The trick then is to get the desired sound (typically dialogue) into the pattern. As a rough rule of thumb a top line will yield a better signal to noise ratio than if the actor is wearing a Lavaliere and facing the noise. A "lowfer" (slang for booming from below) is especially useful when the actor is standing in front of the offending noise and will have lower noise than if the actor is wearing a lavaliere and facing away from the noise. But booming can be a hassle and you need a good boom operator. 2. Because the Sennheiser MKH series of mics uses RF technology the capsule is immune to humidity and, theoretically, could work under water. Other mics, Schoeps for instance, are sensitive to humidity. When the Neumann KMR 82 first was released I made a test in a steam room for humidity. There were no humidity problems with condensed water dripping off the KMR82-after which I stopped the test and went to an old 815 since it was que track and I didn't want to damage my new Neumann shotgun. 3. Large diaphram capsule microphones (non electrets) typically have a polarization voltage on the capsule, When externally polarized this voltage can attract dirt and humidity compromising the life of the capsule. Many famous mics have the polarization potential on the capsule's exterior. Neumann's U87 is one, Under harsh conditions (when I used them for dirty exteriors) a U87 may need its capsule replacement every 5 years. The older U67 uses the same capsule desigh but has the heat of the internal tube to dry out the capsule. AKG's 414 multipattern mic is especially sensitive. when I used to use the AKG 414 (in figure of eight for the null trick described in Tip #1) a capsule would only last me 2 years. Most Neumann LDCs have external polarization. However, Neumann's more modern U89 is internally polarized and doesn't have these problems. All KM series Neumans are internally polarized and almost immortal. So make it your business to know your mics!
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