Lewitt LCT 840 Manual de usuario

www.lewitt-audio.com

LCT 840

EMPHASIZE

THE

YOUR

GENUINE

SOUND

LCT 840 Introduction

Thank you that you have opted for a LEWITT product. In this operating manual you will learn more about your LEWITT microphone, its handling

and its proper usage.

With the LCT Authentica Series, LEWITT introduces a new generation of highly versatile wired condenser microphones that all aim for setting

new benchmarks of technology, sound quality and user-friendliness in both professional studio recording and onstage use.

The microphones of the LCT Authentica Series stand for unaltered sound and innovative features: llluminated Settings, Noiseless Push

Buttons, Automatic Attenuation with Clip Detection and History all ensure error-free sonic perfection and peerless ease of use for today’s

demanding recording artists and engineers.

Day after day, be it for live acts, in home studios or in professional studio productions.

LEWITT wishes you a lot of fun and success with this product!

LCT 840 The product

LEWITT’s LCT 840 is a premium-class externally polarized dual-diaphragm tube microphone designed to excel in a

variety of demanding applications. Equipped with a precision-engineered 1-inch capsule, the LCT 840 stands for

exceptionally warm and classic, solid vintage sound. Perfectly suited for miking vocals and instruments, this rugged

multi-purpose microphone allows for highly nuanced and authentic sound reproduction in the studio and even on

stage. Five switchable polar patterns – omni-directional, cardioid, figure-8, wide-cardioid and super-cardioid –

make the LCT 840 a highly versatile tool for professional audio engineers and performers looking for true and

authentic tube sound.

Like all LEWITT mics, the LCT 840 stands out for its extremely low self-noise of 9 dB and effective rejection of off-axis

sounds. The microphone features three levels of attenuation and three switchable high-pass filters, LEDs and

pushbuttons for noiseless handling on the power supply unit (PSU).

Apart from user-friendly operating controls and advanced technological features so essential to memorable

recordings, the LCT 840 also makes an eye-catching design statement: The microphone is equipped with a

plexiglass inspection window on the front side of the body, so the illuminated tube itself is fully exposed. The inside

window surface is coated with a highly conductive, yet transparent film preventing electromagnetic interference.

In short: The unique combination of innovative design, high-end technology and tube-typical sound quality ensures

magic takes.

LCT 840 Features / Top applications

Features

Ultra-thin 1-inch externally biased, gold-layered low-mass diaphragms combined with a dual

triode tube ensures accurate transient response while providing smooth, warm and airy tube

sound

Five consistent directional characteristics – cardioid, omnidirectional, figure-8, broad cardioid

and supercardioid – offer maximum flexibility

Superior dynamic range of 130 dB-A (Tube) and extremely low self-noise of 9 dB-A for

ear-catching realism and distortion-free sonic depth

3-position switchable pre-attenuation pad (0 dB, 10 dB, and 20 dB) for handling extremely high

sound pressure levels and 3-position high-pass filter

Illuminated user interface and jog dials for easy handling even in dark environments

Noiseless pushbuttons for quick and easy attenuation and HPF selection

Unique features like clipping history and automatic attenuation provide error-free studio recording

and unparalleled ease of use

Solid die-cast metal body with a stylish, oversized tube inspection window specially coated for

maximum protection against electromagnetic interference

Custom PSU 840 power supply unit with sturdy full-metal housing and brushed, anodized black

aluminum front

Extra-large hexagonal ruthenium-galvanized steel mesh grille provides an open acoustic environment

and prevents unwanted internal reflections

Corrosion-resistant gold-plated 3-pin XLR output connector

Comes in a black case; includes PSU 840 power supply unit, LCT 40 SHxx shock mount, LCT 40 Tr audio

cable with gold-plated 11-pin XLR connectors and LCT 40 Wxx windscreen

■

Top applications

Lead and background vocals

Acoustic instruments // piano, guitar,

drums, percussion, strings...

Wind instruments // brass and

woodwinds...

Demanding studio applications

■

User-interface

② On / Off switch

③ Status indicator

④ Polar pattern selection, jog-dial

① Mains voltage selection switch ⑤ High-pass filter indications

⑥ Noiseless high-pass filter

push button

⑦ Pre-attenuation indications

⑧ Noiseless pre-attenuation push button

⑨ 3-pin XLR socket

⑩ 11-pol. XLR-Stecker

Mains socket

Fuse

11-pin audio cable

Getting started

■Make sure that the Mains voltage selection ① switch is set

to the correct position.

■Use the 11-pin audio cable to connect the microphone with

the 11-pin XLR socket on the backside of the PSU.

■Use the 3-pin audio cable to connect your mixer with the

3-pin XLR socket ⑩ on the backside of the PSU.

■Put the LCT 840 into operation by activating the On / Off

switch ② on the backside of the PSU.

LCT 840 Using the mic

⑦

③

⑧

④

⑥

⑤

①

②

⑩

⑨

Using the mic

LCT 840

Status indicator ③

■The microphone is in normal working mode if the status indicator is illuminated in white.

■The microphone is in key-lock mode if the status indicator is not illuminated.

■The microphone experiences clipping due to high SPL if the status indicator flashes in red.

■The microphone is in automatic attenuation mode if the status indicator is illuminated in red

■he microphone indicates the clipping history if the status indicator flashes red and white in an alternating sequence.

Polar pattern selection ④

■The currently active polar pattern is illuminated in white.

■Select up to five different directivity characteristics by briefly turning the jog-dial to the right or left.

High pass filter indications ⑤

■The currently active high-pass filter setting is illuminated in white.

Setting a high-pass filter ⑥

■High-pass filters can be set by briefly pressing the noiseless high-pass filter push button ⑥.

Settings are: linear, 12 dB / octave at 40 Hz and 6 dB / octave at 300 Hz.

LCT 840 Using the mic

Pre-attenuation indications

The currently active pre-attenuation setting is illuminated in white.

⑦

■

Setting a pre-attenuation level

⑧

■⑨0 dB,

Pre-attenuation levels can be set by briefly pressing the noiseless pre-attenuationpush button . Settings are: -10 dB

and 20 dB. Pre-attenuation is used in extremely high SPL environments in order to prevent clipping of the microphone, mixer

and other audio equipment

The microphone will automatically adjust to the next higher attenuation level if it experiences clipping due to a high SPL. The microphone

enters and leaves the automatic attenuation mode by constantly pressing the pre-attenaution push button ⑧ for more than 2 seconds. The

microphone is set to automatic attenuation mode if the status indicator ③ is illuminated in red. Please note that the microphone will need

one second to adjust to the new attenuation level in the event of too high sound pressure levels.

Automatic attenuation function

Using the mic

Key-lock function

The noiseless push buttons and as well as the polar pattern jog dial can be locked by pressing the jog dial

knob for more than 2 seconds.

■⑥ ⑧ ④

④

Clipping history

Checking the clipping history lets you know if the microphone had experienced clipping in the past. The microphone displays

the clipping history after constantly pressing the high-pass push button for more than two seconds. When in clipping history

mode the status indicator flashes red and white in an alternating sequence, the polar pattern indications as well as the high-pass

indications are not illuminated. Clipping history mode provides information and works according to the rules listed below:

⑥

②

⑤

LCT 840

■The last manually set attenuation level is indicated by a constantly illuminated attenuation LED. If clipping has occurred in the past this

LED will flash.

■The clipping history information can only be accessed once. Clipping information will be deleted after leaving this mode by constantly

pressing the high-pass filter push button ⑥ for more than two seconds.

■Clipping history information will be deleted once you access the automatic attenuation mode.

■Clipping history information will not be deleted when unplugging the microphone.

LCT 840 Tech graph

Tech graph

Figure 8-

Super-Cardioid

3 / dB unit

16kHz

dB 1 V / Pa ref.

Broad Cardioid-

Omni Directional-

Cardioid

3 dB unit /

3 / dB unit

16kHz

LCT 840 Tech graph

16kHz

dB 1 V / Pa ref.

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