The MK 8 is often used for M/S and double M/S stereo sound in film sound and music recording, in combination with Colette or CCM microphones and/or a CMIT shotgun microphone.
This type of capsule is a pure dipole. The figure-eight pattern of the MK 8 remains constant from low to high frequencies, which is particularly important when used in an M/S setup. Its sensitivity rolls off more at low frequencies than other capsules, but proximity effect (which can compensate, given relatively close placement) is also more pronounced.
Production of the MK 8 is a special technical accomplishment, because in terms of physics, the available force due to the pressure gradient is minimal. Despite this, the MK 8 has excellent frequency and polar response, near-perfect front/back symmetry, and low inherent noise.
The microphone is comparatively sensitive to solid-borne sound as well as wind and breath noise. Good protection should be considered, e.g. suitable wind screening and/or shock mounting.
The pickup direction is lateral, i.e. perpendicular to the microphone housing, and the 0° and 180° axes are indicated respectively by red and black dots on the capsule housing. When recording with M/S, the 0° axis (as viewed from a position behind the microphone) should point to the left, and the "8" engraved on top of the capsule should be precisely horizontal.
SchoepsCCM 8 Microphone
This capsule type is a true dipole (bidirectional) transducer, operating with a single diaphragm. Its main axis is at a right angle to the capsule, and is marked at 0° and 180° with a red and a black dot respectively.
The inherent qualities of a pure pressure-gradient transducer are readily observed in this capsule type:
The directivity index of a figure-8 pattern is the same as that of a cardioid; if microphones with these two patterns are placed at the same distance from a sound source, a quantitatively similar balance of direct and reverberant sound would be picked up. In practice such a comparison would be deceptive, however, since a figure-8 does not respond to sound coming from the sides, from above or from beneath its main axis as does a cardioid. The figure-8 has a rear lobe equal in sensitivity to its front lobe, and this exactly makes up the quantitative difference – but in normally reverberant settings, the sound reaching a figure-8's rear lobe will be delayed and dispersed to a considerably greater extent than the reverberant sound energy which a cardioid picks up from its front and sides; the reflected sound will typically be subject to far more high frequency absorption as well. Thus the reverberant sound energy picked up by a figure-8, though theoretically equal in amount, is quite different in character from that which would be picked up by a cardioid in the same position.
The sound quality of the CCM/MK 8 is clear and neutral.
When an MK 8 is used as a spot microphone, care must be taken to avoid picking up early reflections or unwanted direct sound from its rear, since sound arriving from the back is picked up with full level but reversed in polarity. This could result in partial cancellation of the intended sound, which can lead to comb-filter effects at higher frequencies.
When MS stereo recordings are made, the 0° axis normally faces to the left as viewed from behind the microphone setup. The “8“ engraved on the top of the housing should be aligned on its side so as to appear horizontal, at a precise right angle to the Mid capsule. The microphone should be placed directly above or beneath the “M“ channel microphone, and as close to it as possible.
|Frequency range||40 Hz - 15 kHz|
|Sensitivity||-38,5 dB (V/Pa)|
|Maximum sound pressure level (THD < 0.5 %)||136 dB-SPL (P48)|
|128 dB-SPL (P12)|
|Maximum output voltage||2,6 V (8,3 dbV) with 2 kΩ load|
|Low cut filter||20 Hz, 12 dB/Okt|
|Output impedance||90 Ω @ 1 kHz|
|Maximum cable length||> 400 m|
|SCHOEPS RFI Shield||No|
|Powering standard / Valid range||P48 / >40 V|
|P12 / >10 V|
|Current consumption||4 mA (P48)|
|3,6 mA (P12)|
|Common mode rejection ratio (at 1 kHz)||> 55 dB|
|Minimum recommended load impedance||2 kΩ|
|Output||Lemo (CCM-L) or XLR-3M (CCM-U), analog, 1 channel|
|Surface finish||matte gray (g) or custom color|