The LCT 550 is the first and only large-diaphragm studio microphone ever to achieve 0 dB-A self-noise*, and thus the world’s quietest. That makes it possible to capture even extremely weak signals with great precision and detail.
The Austrian-developed LCT 550 sets new standards in terms of more than just self-noise. A dynamic range of 140 dB-A guarantees the best-possible results even in challenging settings. The three pre-attenuation levels (0 dB, -6 dB and -12 dB) increase maximum SPL to as high as 155 dB-A. The LCT 550 also offers a clipping history as well as an auto-attenuation mode that automatically switches to the next level of attenuation if the signal is too strong. For the elimination of structure-borne noise, there are two high-pass filters: 80Hz, 12dB/octave and 160Hz, 6dB/octave.
Manufacturing tolerances have been minimized thanks to highly precise calibration of the capsule and the electronics – which means that any two microphones from this series, set identically, will always form a matched pair at +/- 0 dB!
* 0dB-A electronics only, 3 dB-A according to IEC 60268-1 due to Brownian motion (in simple terms: the sound caused by the movement of air molecules ...)
Acoustical operating principle pressure gradient transducer, externally polarized
Transducer Ø 25.4 mm, 1 inch
Polar pattern cardioid
Frequency range 20 ... 20.000 Hz
Sensitivity 36 mV / Pa (-29 dBV)
Signal / noise ratio 91 dB-A
Equivalent noise level 0 dB-A, electronics only, 3 dB-A, according to IEC 60268-1 due to Brownian Motion
Dynamic range of FET mic. Amp. 140 dB-A
Max. SPL for 0,5 % THD
143 dB, 0 dB pre-attenuation
149 dB, 6 dB pre-attenuation
155 dB, 12 dB pre-attenuation
Pre-attenuation pad 6 dB, 12 dB switchable
Bass cut filter slope 12 dB / octave at 80 Hz, 6 dB / octave at 160 Hz
Rated impedance < 150 ohms
Rated load impedance > 1.000 ohms
Supply voltage 48 V +/- 4 V
Current consumption 5.5 mA
Connector gold plated 3-pin XLR
Dimensions 158 x 52 x 36 mm, 6.22 x 2.04 x 1.42 inch
Net weight 425 g, 14.9 oz.