Shure VP88 Handleiding

Shure Microfoon VP88

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Model VP88 User Guide

27C3043 (Rev. 7) Printed in U.S.A.

FEATURES

•

Time-coherent, Mid-Side (M-S) design for optimal

stereo imaging.

•

Built-in stereo matrix for direct control of the stereo spread; di-

rect M-S outputs provided.

•

40 to 20,000 Hz frequency response.

•

Low noise and distortion, wide dynamic range.

•

Switch-selectable, low-frequency roll-off (12 dB/octave

below 80 Hz) for reduced pickup of ambient noise and stand

vibration.

•

Phantom power or 6V camera battery with LED power

indicator.

•

Internal shock mount for reduced stand vibration and

handling noise.

•

Impact resistant, durable construction.

•

Integrated heavy-duty “pop” screen.

•

Windscreen, swivel mount adapter, and Y-cable

included.

GENERAL DESCRIPTION

The Shure Model VP88 is a stereo microphone equally effective

in studio broadcasting applications as in the field for electronic

news gathering (ENG).

This stereo microphone combines two condenser cartridges in a

single housing, in a mid-side (M-S) microphone cartridge configu-

ration. One cartridge (Mid) faces forward to capture on-axis sound

in a cardioid pattern. The other cartridge (Side) is bi-directional,

capturing sound from either side.

Containing three settings for different degrees of stereo image

separation, the VP88 contains an internal M-S matrix that can be

bypassed if an external matrix is used, or if stereo imaging is done

in post-production. External switches control output mode, stereo

imaging, low-frequency roll off settings, and battery on/off.

When the VP88 is set for stereo mode operation (H, M, or L), the

left and right signals should remain fully separated and kept at

equal levels to maintain a balanced stereo effect.

MOUNTING

The VP88 can be mounted on a standard microphone floor

stand, fishpole or boom. Make sure the front of the grille faces the

sound source and the top of the microphone faces up, so that the

the resulting stereo image matches the left and right components

of the sound source.

MICROPHONE ORIENTATION

FIGURE 1

A88SM External Shock Mount

The optional A88SM Shock Mount provides optimum isolation

from stand-transmitted shock and vibration. The A88SM is ideal for

critical studio applications and contains a standard mounting foot

for use with most electronic news gathering (ENG) video cameras.

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POWER

Phantom Power

The VP88 can operate on an internal 6V battery or phantom

power from any microphone mixer or console providing 9 to 52

Vdc, or by a phantom power supply such as the Shure PS1A. Each

balanced audio cable pair (pins 2 and 3: Mid/Left; pins 4 and 5:

Side/Right) carries the supply current to the microphone, and the

cable shield (pin 1) is the ground return.

The Mid or Side output can be used individually with either

phantom or battery power. When operating in the Stereo mode

without battery, both Mid/Left and Side/Right outputs must be

phantom powered.

Battery Power

If phantom power is not available, move the Battery switch to the

Batt On position. The adjacent LED will flash indicating at least five

hours of useful battery life, and if no flashing is observed the

battery should be replaced. The battery does not drain when

phantom power is applied.

Installing and Replacing the Battery

The VP88 uses a 6V cylindrical battery commonly used in

cameras. Average battery life depends on the type of battery:

typically 70 hours for silver oxide/lithium and 40 hours for alkaline.

LIST OF REPLACEMENT AND COMPATIBLE BATTERIES

TABLE 1

To install or replace the battery, proceed as follows:

1. Disconnect the microphone cable and unscrew the VP88

lower handle.

2. Carefully slide the lower handle away from the grille,

exposing the battery compartment. If necessary, remove

the old battery.

3. Insert the new battery, observing the polarity marking in the

battery compartment.

4. Slide the lower handle back into position and tighten.

CONNECTIONS

Use the supplied Y-splitter cable to connect the VP88 to two

inputs of a mixer or console.

The red connector, marked “M” and “L”, carries the Mid signal (in

MS mode) or left signal (in stereo mode).

The green connector, marked “S” and “R”, carries the Side signal

(in MS mode) or right signal (in stereo mode).

For stereo mode operation, connect the left (L) splitter connector

to the Channel 1 input and the right (R) splitter connector to the

Channel 2 input of the mixer or console. Set the Channel 1 pan pot

to full left and the Channel 2 pan pot to full right.

NOTE: Use the Shure C110 Extension Cable (available as an ac-

cesory) for extended cable runs between the VP88 and a

mixer or console.

Using an Additional Microphone

A second (mono) microphone can be used for interviewing or

close miking. Turn its channel pan pot to the center position and

set its level independently.

Monitoring

To check the balance for the mono listener, monitor sound in

mono mode as well as stereo. Since the side signal is cancelled in

mono, the mono output will be equal to the cardioid Mid cartridge

signal only, regardless of the side level control setting.

Minimizing Wind and Breath Noise

The integrated pop filter provides reduction of breath and wind

sound. Use the removable foam windscreen for high intensity wind

and speaking conditions.

LOW-FREQUENCY ROLLOFF

A low-frequency rolloff (12 dB per octave cut below 80 Hz) rolloff

can be useful in reducing pickup of low-frequency noise and vibra-

tion. Set the upper control switch on the VP88 to either of the two

low-frequency rolloff positions, depending on whether phantom or

battery power is being used. See Figure 2.

ROLLOFF SELECTION SWITCH

FIGURE 2

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Panasonic 4G13 - 4LR44

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OUTPUT MODE

The lower control sets the VP88 to either MS Mode, or one of

three Stereo modes. (L, M, or H). See Figure 3.

OUTPUT MODE SELECTION SWITCH

FIGURE 3

Stereo Output Mode

In Stereo Mode, the VP88 uses its internal matrix to mix the Mid

and Side signals and provide Left and Right stereo outputs. The

three settings (H, M, and L), determine the strength or width of the

stereo effect, as described below. Nominal Left and Right pickup

patterns are shown in the following series.

NOTE: The mono sum (Left + Right) in any Stereo position is al-

ways equal to the Mid signal, ensuring mono compatibil-

ity.

L (Low): Figure 4. Side level 6.0 dB lower than Mid level. The

stereo image spread of the stereo images is small. Use this setting

for distant miking, or in situations where the microphone direction-

ality cannot be well controlled, such as hand-held use. In the L

position, the microphone also picks up the least amount of ambient

sound from the side, and can be used to reduce high ambient noise

or reverberation. The L setting can be useful if the area being

miked is already very wide. However, the degree of stereo effect

may be compromised in narrow performing areas.

M (Medium): Figure 5. Side level is 1.9 dB lower than Mid level.

The increased side ambience pickup and stereo spread make the

M setting ideal for most applications.

H (High): Figure 6. Side level is1.6 dB higher than Mid level. The

H position provides the most side ambience pickup and the

greatest amount of stereo spread. This setting is only appropriate

if a high degree of ambience pickup is acceptable and the perform-

ing area is not excessively wide.

MS Output Mode. Figure 7. In MS mode, the VP88's internal

stereo matrix is bypassed. The signal from the mid cartridge is sent

to the red connector on the Y-splitter cable (M) and the side

cartridge output is sent to the green connector (S). The Side

on-axis sensitivity (90° from the front axis of the microphone) is 1.6

dB higher than the on-axis sensitivity of the Mid output. The sen-

sitivities of the Mid and Side outputs are equal at 45° off the front

axis of the microphone.

The polarity of the left lobe of the Side output matches the

polarity of the Mid output. The right lobe of the Side output is

opposite polarity.

LOW STEREO (L)

FIGURE 4

MEDIUM STEREO (M)

FIGURE 5

HIGH STEREO (H)

FIGURE 6

MS OUTPUT MODE

FIGURE 7

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Product specificaties

Merk:	Shure
Categorie:	Microfoon
Model:	VP88
Kleur van het product:	Zwart
Hoogte:	290 mm
Soort:	Microfoon voor studio's
Connectiviteitstechnologie:	Bedraad
Diameter:	39.7 mm
Geluidsdrukniveau:	129 dB
Aansluiting:	XLR-3
Hoofdtelefoon uit:	Nee
Verpakkingsinhoud:	Y-cable\nwindscreen\nswivel adapter
Microphone direction type:	Tweerichtingsmicrofoon
Spreekspoel types:	Condensor
Frequentie microfoon:	40 - 20000 Hz
Gewicht microfoon:	417 g