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OmnidirectionalCardioidHypercardioidBidirectionalWide CardioidLewitt Audio LCT 640

Multi-Pattern Condenser Microphone

The Authentica LCT 640 is a large-diaphragm FET condenser from Lewitt. 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.

Lewitt Audio LCT640 Cutaway ViewA 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

Lewitt LCT640 Side ViewThe 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.

Lewitt Audio LCT 640 KitThe mic ships with a shockmount (Lewitt p/n LCT 40 SHx), foam windscreen (p/n LCT 40 Wx), leather storage pouch (p/n DTP 40 Lb), and a foam-lined black aluminum flightcase.

Permalink: Lewitt Audio LCT-640

The mic was released in 2010.


Frequency Response - OmnidirectionalClick Graph to Compare!
LCT 640 Omnidirectional Frequency Response Chart
Frequency Response - CardioidClick Graph to Compare!
LCT 640 Cardioid Frequency Response Chart
Frequency Response - HypercardioidClick Graph to Compare!
LCT 640 Hypercardioid Frequency Response Chart
Frequency Response - BidirectionalClick Graph to Compare!
LCT 640 Bidirectional Frequency Response Chart
Frequency Response - Wide CardioidClick Graph to Compare!
LCT 640 Wide Cardioid Frequency Response Chart
Pickup Patterns Pads & Filters
Omnidirectional (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)
  • Pad: -6dB (Via Switch)
  • Pad: -12dB (Via Switch)
  • Pad: -18dB (Via Switch)
  • Filter: -12 dB/octave @ 40Hz (Via Switch)
  • Filter: -6 dB/octave @ 150Hz (Via Switch)
  • Filter: -6 dB/octave @ 300Hz (Via Switch)
Capsule Dimensions Impedance SPL/Noise
Diaphragm diameter: 25.4mm
Capsule diameter: 33mm
Diaphragm gauge: 4 microns
150 Ohms (Low) Max SPL: 163 dB
Self-noise: 10.0 dB(A)
Weight Length Max Diameter Interface(s)
432g (15.24oz) 158mm (6.22'') n/a
  • 3-pin XLR male (1)
Power Specifications
  • Requires phantom power
  • Phantom voltage: 48 ± 4v

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