Lewitt Audio LCT 640
Multi-Pattern Condenser Microphone
The Authentica LCT 640 is Lewitt Audio’s flagship large-diaphragm FET condenser. It is a multipattern design with a transformerless output and multiple pad and filter options.
The capsule in the LCT 640 is a dual-diaphragm version of the capsule in the fixed-cardioid LCT 540. Both mics use a large-diaphragm design whose backplate drilling pattern closely resembles the Neumann K67. The diaphragm material is 4-micron Mylar, sputtered with gold. The active diaphragm area measures 25.4mm in diameter, within a 33mm capsule.
Pattern control is provided by an electronic pushbutton switch reminiscent of the AKG C414; the mic provides Omni, Wide Cardioid, Cardioid, Hypercardioid, and Figure-8 patterns.
A second pushbutton switch cycles through the four preattenuation pad options: 0dB, -6dB, -12dB, and -18dB. At -18dB, the mic’s max SPL (at 0.5% distortion) is 160dB, suitable for kick drums and loud brass.
A third pushbutton switch cycles through four high-pass filters, offering different slopes and cutoffs:
- -12dB/octave at 40Hz
- -6dB/octave at 150Hz
- -6dB/octave at 300Hz
The currently-selected pattern, pad, and filter options are indicated by LED lights behind the microphone’s faceplate. The pushbuttons operate without causing audible clicks or pops through the signal chain.
The mic’s PCB employs surface-mount components.
The transformerless amplifier circuit is very low-noise: 10dBA in Cardioid, 12dBA in Omni.
The unusually open mesh grille is made of “ruthenium-galvanized” steel, backed by a fine-gauge screen.
Permalink: Lewitt Audio LCT-640
The mic was released in 2010.
|Pickup Patterns||Pads & Filters|
(10 mV/Pa; 20 - 20,000 Hz)
Cardioid (13 mV/Pa; 20 - 20,000 Hz)
Hypercardioid (n/a mV/Pa; 20 - 20,000 Hz)
Bidirectional (9 mV/Pa; 20 - 20,000 Hz)
Wide Cardioid (n/a mV/Pa; 20 - 20,000 Hz)
| Diaphragm diameter: 25.4mm
Capsule diameter: 33mm
Diaphragm gauge: 4 microns
|150 Ohms (Low)||Max SPL: 163 dB
Self-noise: 10.0 dB(A)
|432g (15.24oz)||158mm (6.22'')||n/a||
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