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Schoeps話筒麥克風 MK 8 話筒 Schoeps麥克風 MK8 8字形話筒
話筒拾音頭 MK 8
純壓力梯度傳聲器
整個頻率范圍內具有理想的一致性8字形指向
模式
側向拾音(拾取方向和話筒筒身垂直)
很適用于M/S和Blumlein立體聲錄音
這種類型的拾音頭是真正的偶極(雙向)傳聲器,由一個振膜來控制。其主軸和拾音頭的角度為0°
和180°,分別用紅點和黑點做了標識。當制作M/S制式立體聲錄音時,從話筒安裝位置的后側看,其0°軸通常位于左側(從話筒后面看)。
刻在話筒頂端的“8”字形應該位于水平方向,與拾音頭成直角。話筒應該直接放置于“M”通道話筒的正上方或正下方,并盡可能地靠近它。
這種話筒類型使用的純壓感式傳聲器具有如下內
在的高品質特性:
-降低低頻靈敏度。
-指向性與頻率無關。
-會出現近講效應。
MK8的聲音質量清晰并忠實于原音。頻響跌落特性出現在16kHz以上。
當MK8作為點話筒時,必須要注意避免拾取到來自話筒后方的反射聲或多余的直達聲,因為如果拾取到來自后方的聲音其極性會翻轉。這會讓有用聲音的極性抵消,并影響更高頻率上梳狀濾波器的效果。
8字形拾音頭的指向性和心形相同;如果這兩種話筒和音源等距,將會拾取到數量相近的直達聲和混響聲。實際上,這很具有欺騙性,因為8字形拾音頭不會響應來自兩側、主軸上部或下部的聲音,而心形拾音頭則會響應。8字形拾音頭其后突角和前突角具有相同的靈敏度,這樣可以補償數量上的差異-但通常在混響設置中,聲音到達8字形拾音頭的后突角會被延遲,并會擴散到比混響聲能量(心形拾取前方和兩側的聲能)更大的區域;反射聲通常會受到更多的高頻吸收。因此8字形拾音頭雖然在理論上拾取到等量的混響聲能,但在相同的位置和心形拾音頭比較,特性上具有很大的差異。
長度:22mm
直徑:20mm
重量:17g
MK 8 MICROPHONE CAPSULE
PROPERTIES
Figure-8 characteristic (pure pressure-gradient transducer)
Pickup direction: Lateral (perpendicular to the microphone axis)
0°-axis marked with a red dot
Preferred application: M/S, double M/S and "Blumlein" stereo
DESCRIPTION
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.
TECHNICAL SPECIFICATIONS
Pickup pattern
Figure-of-eight
Frequency range : 40 Hz - 15 kHz with CMC6,
40 Hz - 15 kHz with CMC6xt (above 20 kHz, the level of -3 dB for the cutoff frequency is not exceeded despite the xt boost)
Sensitivity : -38,5 dB (V/Pa), 12 mV/Pa with CMC 6
Equivalent noise level (A-weighted) : 17 dB with CMC 6
Equivalent noise level (CCIR) : 26 dB with CMC 6
Signal-to-noise ratio (A-weighted) : 77 dB with CMC 6
Maximum sound pressure level (THD < 0.5 %) : 133 dB-SPL with CMC 6
Length : 34 mm
Diameter : 20 mm
Weight : 18 g
Surface finish : matte gray (g) or custom color