Audio Technica AT875R (超窄指向性電容咪高峰)

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  • 專為影視製作和廣播採訪(ENG/EFP)的音頻收音而設計。
  • 十分短的長度設計(175mm),適合於小型數位攝像機使用。
  • 提供窄角度的超指向性能,給與遠距離的收音效果。
  • 由咪高峰兩旁到後方均有極佳抗噪音能力。
  • 特有的頻率響應,可減低攝像機和手持雜訊。
  • 使用幻象供電工作。

AT875R提供高靈敏度的收音效能,可確保能接收到最大的音源。而在某些情況下,為避免發生超負載輸入而出現破聲情況,需要在咪高峰和前置放大器之間加入AT8202等的電平衰減器。

咪高峰符合RoHS規格,在構造上不含有歐盟禁用的危害性物質。

AT875R咪高峰需使用11V至52V幻象供電工作。

咪高峰的XLRM卡農輸出端為低阻抗平衡輸出,咪高峰音頻信號最終以卡農公頭的2號及3號針腳輸出,而1號針腳則為地線(遮罩)連接。輸出相位將以正相位電平設於2號針腳上。

AT875R 産品規格
元件
固定充電背板,靜電型電容式
指向性
超窄指向性
頻率響應
90Hz~20,000Hz
開通靈敏度
-30 dB (31.6 mV) 以 1V 於 1 Pa
阻抗
100 歐姆
訊噪比
74 dB, 1 kHz 於 1 Pa
幻象供電
11~52V DC 幻象供電
最大輸入聲壓級
127 dB 聲壓, 1 kHz 於 1% T.H.D.
重量
80g
尺寸
175.0 mm 長, 21.0 mm 直徑
插頭
內置三針XLRM卡農公頭
隨機附件
AT8405a ⅝”-27接頭轉軸式支架;
海棉防風罩;
⅝”-27至⅜”-16轉接頭;
便攜袋

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  • Designed for video production and broadcast (ENG/EFP) audio acquisition
  • Extremely short length (175mm) ideal for use with compact digital cameras
  • Provides the narrow acceptance angle desirable for long-distance sound pickup
  • Excellent sound rejection from the sides and rear of mic
  • Tailored response minimizes camera and handling noise
  • Operates on phantom power only

The high sensitivity of the AT875R assures useful output and an excellent match to most input sources. In some cases, however, an attenuator such as the Audio-Technica AT8202 may be required between the microphone and preamplifier to avoid overloading sensitive input stages.

The microphone is RoHS compliant–free from all substances specified in the EU directive on hazardous substances.

The AT875R requires 11V to 52V DC phantom power for operation.

Output from the microphone’s XLRM-type connector is low impedance (Lo-Z) balanced. The signal appears across Pins 2 and 3; Pin 1 is ground (shield). Output phase is “Pin 2 hot” – positive acoustic pressure produces positive voltage at Pin 2.

AT875R Specifications
Element
Fixed-charge back plate, permanently polarized condenser
Polar Pattern
Line + gradient
Frequency Response
90Hz~20,000Hz
Open Circuit Sensitivity
-30 dB (31.6 mV) re 1V at 1 Pa
Impedance
100 ohms
Signal-To-Noise Ratio
74 dB, 1 kHz at 1 Pa
Phantom Power Requirements
11~52V DC Phantom
Maximum Input Sound Level
127 dB SPL, 1KHz at 1% T.H.D
Weight
80g
Dimensions
21mm X 175mm (Diameter X Long)
Connector
Integral 3-pin XLRM-type
Accessories Furnished
AT8405a stand clamp for ⅝”-27 threaded stands;
⅝”-27 to ⅜”-16 threaded adapter;
windscreen;
protective carrying case


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Audio Technica, microphone 咪高峰, 拍攝收音 DSLR camera, 採訪, 有線咪, 電容 (condenser)

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