Inter-m IMX-824, IMX-832, IMX-840 Operation Manual

Operation Manual

Mixing Console (24ch/32ch/40ch)

IMX-824/832/840

MIXING CONSOLE

Contents

Welcome

Warning.........................................................................................................................................1

Unpacking......................................................................................................................................2

Installation

Environment....................................................................................................................................2

Important Safety Instructions.............................................................................................................2

Introduction .....................................................................................................................................3

Features............................................................................................................................................3

Mono Input Channel ......................................................................................................................4

Stereo Input Channel .....................................................................................................................8

Sub-Group/Aux Master..............................................................................................................12

Mix Master/MTX Master.............................................................................................................15

EFX Return Input...........................................................................................................................18

Monitor and Talk Back ................................................................................................................20

Cable and Connector Configurations........................................................................................23

VU-11 Meter Unit(Option)...........................................................................................................25

Applications ..................................................................................................................................26

Block Diagram ..............................................................................................................................27

Appendix.......................................................................................................................................28

Specifications ................................................................................................................................29

Service

Procedures....................................................................................................................................32

Schematic.....................................................................................................................................32

Parts List .......................................................................................................................................32

Variations and Options ...............................................................................................................32

Warranty .......................................................................................................................................32

MIXING CONSOLE

IMX-824/832/840

Welcome

A personal welcome to you from the management and employees of Inter-M

All of the co-workers here at Inter-M are dedicated to providing excellent products with inherently good value, and we are delighted you have purchased one of our products.

We sincerely trust this product will provide years of satisfactory service, but if anything is not to your complete satisfaction, we will endeavor to make things right.

Welcome to Inter-M, and thank you for becoming part of our worldwide extended family!

RISK OF ELECTRIC SHOCK

DO NOT OPEN

CAUTION

CAUTION: TO REDUCE THE RISK OF ELECTRIC SHOCK.

DO NOT REMOVE COVER (OR BACK).

NO USER-SERVICEABLE PARTS INSIDE.

REFER SERVICING TO QUALIFIED SERVICE PERSONNEL.

WARNING

To prevent fire or shock hazard, do not expose the unit to rain or moisture.

*Do not install this equipment in a confined space such as a book case or similar unit. *The apparatus shall not be exposed to dripping or splashing and no objects filled with liquids, such vases, shall be placed on the apparatus. *Worded: “WARNING FOR YOUR PROTECTION PLEASE READ THE FOLLOWING-WATER AND MOISTURE: Unit should not be used

near water(e.g. near a bathtub, washbowl, kitchen sink, laundry tub, in a wet basement, or near a swimming pool, etc). Care should be taken so than objects do not fall and liquids are not spilled into the enclosure through openings.”

This symbol is intended to alert the user to the presence of uninsulated “dangerous voltage” within the product’s enclosure that may be of sufficient magnitude to constitute a risk of electric shock to persons.

This symbol is intended to alert the user to the presence of important operation and maintenance (servicing) instructions in the literature accompanying the appliance.

Caution: To prevent electric shock do not use this (polarized) plug with

an extension cord, receptacle or other outlet unless the blades can be fully inserted to prevent blade exposure.

Attentions: Pour prévenir les chocs électriques ne pas utiliser cette

fiche polarisée avec un prolongateur, une prise de courant on une autre sortie de courant, sauf si les lames peuvent étre insérées à fond sans en laisser aucune partie à découvert.

MIXING CONSOLE

IMX-824/832/840

Installation

Environment

Never place this product in an environment which could alter its performance or reduce its service life. Such environments usually include high levels of heat, dust, moisture, and vibration.

Important Safety Instructions

1. Read these instructions.

2. Keep these instructions.

3. Heed all warnings.

4. Follow all instructions.

5. Do not use this apparatus near water.

6. Clean only with dry cloth.

7. Do not block any ventilation openings. Install in accordance with the manufacturer’s instructions.

8. Do not install near any heat sources such as radiators, heat registers, stoves, or other apparatus (including amplifiers) that produce heat.

9. Do not defeat the safety purpose of the polarized or grounding-type plug. A polarized plug has two blades with one wider than the other. A grounding type plug has two blades and a third grounding prong. The wide blade or the third prong are provided for your safety. If the provided plug does not fit into your outlet, consult an electrician for replacement of the obsolete outlet.

10. Protect the power cord from being walked on or pinched particularly at plugs, convenience receptacles, and

the point where they exit from the apparatus.

11. Only use attachments/accessories specified by the manufacturer.

12. Use only with the cart, stand, tripod, bracket, or table specified by the manufacturer, or sold with the apparatus.

When a cart is used, use caution when moving the cart/apparatus combination to avoid injury from tip-over.

13. Unplug this apparatus during lightning storms or when unused for long periods of time.

14. Refer all servicing to qualified service personnel. Servicing is required when the

apparatus has been damaged in any way, such as power-supply cord or plug is damaged, liquid has been spilled or objects have fallen into the apparatus, the apparatus has been exposed to rain or moisture, does not operate normally, or has been dropped.

S3125A

Unpacking

Please take a few minutes to read this manual to familiarize yourself with important information regarding product features, and operation.

As with most electronic devices, ORIGINAL PACKAGING (OR EQUAL) IS REQUIRED in the unlikely event that the product needs to be returned for servicing.

S3125A

MIXING CONSOLE

IMX-824/832/840

Features

- FLEXIBILITY OF CHOICE

Three frame sizes accommodating 24, 32 or 40 Mono inputs channels. Optional VU meter-bridge.

- FULL FUNCTION INPUT CHANNELS

Mono channels are equipped with Individual 48-volt phantom power supply, 4-band equalizer with two swept mid frequencies, swept frequency high-pass filter, 8 Auxiliary sends with pre-fader signal switching, Direct output, Full LCR or LR+Mono routing system, 100mm high-quality fader, 4 MUTE-groups and 4 segment signal metering.

- LCR PANNING

All the Inputs and Sub-groups can be routed to Left, Right and Center/Mono bus providing ultimate control over sound stage positioning and construction.

- 2 STEREO INPUT CHANNELS

Full function Stereo Input Channels with 4-band EQ.

- DUAL PURPOSE CONSOLE - “FADER FLIP” FUNCTION

Audio Sub-group masters and AUX masters have a “FLIP” facility providing easy configuration for FOH and MONITOR application.

- 4 MATRIX OUTPUTS

4 Matrix sends from all the Sub-groups and MIX L, C, R outputs.

- MUTE GROUPS

4 MUTE Groups allows preset MUTE scenes. This advanced MUTE circuit gives silent muting.

- 6 STEREO RETURNS

Each Stereo Return has 3-band EQ, 2 AUX sends, full Sub-group assignment, 60mm high quality fader and solo system.

- FULL TALK-BACK SYSTEM

Talk-Back assignment to AUX, Groups, MIX outputs can be selected. Matrix outputs have Talk-Back enable switches.

Introduction

Thank you for choosing the IMX-800 SERIES professional mixing console. Your IMX-800 SERIES benefits from over 20 years of Inter-M’s professional audio design and manufacturing experience. This operation manual should quickly acquaint you with the console’s features and controls, while offering some suggestions for its use in various applications. Although we believe the information in this guide to be reliable, we do not assume responsibility for inaccuracies. We also reserve the right to make changes in the interest of further product development.

MIXING CONSOLE

IMX-824/832/840

Mono Input Channel

1. FRONT PANEL

1. 48V PHANTOM POWER

This provides +48V phantom power to XLR input. DO NOT use unbalanced sources with the phantom power switched on. The voltage on pins 2 & 3 of the XLR connector may cause serious damage.

Please make sure the fader is at the position before switching phantom power on or off to avoid loud pops through the sound system loudspeakers (the “pop” sound may damage the loudspeaker system components).

2. -26dB PAD

Reduces input level at both the jack and XLR sockets by 26dB. This control helps prevent high-level source signals from overloading the input preamplifier circuit.

3. GAIN

The input signal’s gain is continuously variable from +16dB to +60dB (-10dB to +34dB with the pad enabled). The actual value of the gain required will depend upon the source and should ideally be set such that peaks in level on the input should not cause the input amplifier to overload. If the peak level indicator LED located near the channel fader flashes frequently (or is constantly illuminated), the gain is set too high. An optimal setting for the gain control is indicated by the +12 indicator LED flashing occasionally with normal program material.

4. POLARITY REVERSE

Reverses input signal’s phase, or more accurately, polarity. This function is commonly needed where two microphones are used facing each other (for example when using a microphone on both the top and bottom of a snare drum). There are no hard and fast rules on this, but give it a whirl and let your ears decide.

5. HPF

The 12dB/octave High-Pass Filter is a useful tool in combating undesirable low frequency content, such as microphone handling noise, wind noise, or bass build-up on stage. The

FREQ control varies the cut-off frequency from 20-400Hz. The IN switch inserts the HPF into the signal path.

6. EQUALIZER

Mixer’s equalizer is a 4-band Baxandall type. LF and HF bands are shelving response, with fixed frequencies of 80Hz and 12kHz respectively. Its two bell-response MID bands are semi-parametric, meaning that the center frequency of the curve can be varied. The IN switch inserts all four bands into the signal path, which is useful when checking the effectiveness of your EQ settings

MIXING CONSOLE

IMX-824/832/840

7. AUXILIARY

Your IMX-800 SERIES has 8 auxiliary sends. These are commonly used for effects, stage monitors and any additional sends, e.g. camera sound. Each control varies the amount of signal sent to the related Auxiliary bus from

to +6dB. Ordinarily, auxiliaries are fed post fader, meaning that the channel’s fader level will affect the level sent to the auxiliary. PRE switches in the auxiliary section change the signal source to pre fader. These are grouped to allow maximum flexibility.

8. BLEND

Adjusts level balance between MIX L/R buses and MIX C bus. This does not affect GROUP buses. At the L/R (fully anticlockwise) position, the stereo image is made up using only the L and R buses. By turning BLEND control clockwise, the C bus is introduced. At the C (fully clockwise) position, signals panned centrally will only appear on C output. This is shown in the diagram below.

9. PAN

Controls the signal’s position in the stereo image. This affects both main MIX outputs as well as any groups to which the channel is routed. Panning left sends the signal to odd numbered groups only, and panning right sends it to even numbered groups only. If, for example, you are panning from hard left to center, you will notice a 3dB drop in the left channel as you do so. This “panning law” ensures that signals sound equally loud at all pan positions.

MIXING CONSOLE

IMX-824/832/840

10. MUTE

This removes the channel’s signal from all MIX, group and auxiliary buses, although audio will continue to pass through any attached insert devices. If it is preferable for pre-fader auxiliary sends to be unaffected by a channel’s mute status, this can be achieved by changing an internal jumper setting. If the button is not engaged, but it is half-bright illuminated, this means that MUTE GRP, which described below, is active.

11. CHANNEL LEVEL

Displays the channel’s pre-fader signal level. The “SIG” lamp indicates the presence of signal at around 12dB below nominal level. The “PK” lamp warns of signal levels approaching the upper headroom limit, which means about 3dB to the clip point. We recommend that you reduce the input gain to avoid unpleasant distortion!

12. BUS ROUTING SWITCHES

Connects the channel signal to each Sub-GROUP and MIX buses. After-fader signal is fed via PANPOT section. GROUP 1-2, 3-4, 5-6, 7-8 behaves as stereo path by panning. ODD numbers are left, and EVEN are right. GROUP 1-2, 3-4, 5-6, 7-8 are standard L/R(STEREO) mixes that may be panned L to R. The “LCR” switch sends the signal to the MIX L, R, and C busses. The “MONO” switch sends the signal only to the MONO/C bus. When the “MONO” switch is selected, the MONO/C signal is not affected by the PAN or BLEND controls.

13. MUTE GRP

These switches assign the channel to any combination of four mute groups. When a mute group master is activated, all channels assigned to that group will be automatically muted, and the MUTE switch will turn on at half bright.

14. SOLO

Routes the signal to the solo bus for isolated auditioning and detailed metering.

15. CHANNEL FADER

A professional 100mm fader gives you smooth, high-resolution control over the channel level.

MIXING CONSOLE

IMX-824/832/840

2. REAR PANEL

1. DIRECT OUT

As standard, the direct out jack socket carries the channel’s post-fader signal at a nominal level of 0dBu. It is possible to feed this output from several points in the signal chain: PreEQ, Pre-Fader, Pre-Insertion and Post-Fader, by altering internal jumper settings.

2. INSERT

1/4” TRS jack for inserting external audio devices into the signal chain. The send is post-filter, pre-EQ. The tip is wired to a ground compensated send, unbalanced return is via the ring and sleeve. Nominal I/O level is 0dBu.

3. HI-Z INPUT

Use this input when connecting sources such as instruments, keyboards or playback devices. This balanced input signal is summed with the XLR input, but you needn’t worry about phantom power; that will only be supplied from the XLR. Available input level is about 26dB higher than the XLR input, and impedance of this input is approximately 30k ohms. If using an unbalanced source, please make sure to link Sleeve and Ring together to avoid unwanted noise.

4. MIC INPUT

Microphone inputs are on Female XLR. The impedance of this input is approximately 2k ohms.

MIXING CONSOLE

IMX-824/832/840

Stereo Input Channel

1. FRONT PANEL

1. GAIN

Gain is variable from -10dB to +20dB.

2. R POLARITY INVERT

Reverses phase or, more accurately, polarity of the right channel only.

3. L+R

Sums left and right inputs together to make a mono signal.

4. EQUALIZER

Here is a four-band traditional Baxandall equalizer. LF and HF filters have a shelving response at 80Hz and 12kHz respectively. High Mid and Low Mid bands have a bell response centered around 3.15kHz and 315Hz respectively. The IN switch inserts all four bands into the signal path, which is useful when checking the effectiveness of your EQ settings.

MIXING CONSOLE

IMX-824/832/840

5. AUXILIARY

6. BLEND

7. PAN

Controls the signal’s position, or balance, in the stereo image. This affects both main MIX outputs as well as any groups to which the channel is routed. For example, with the balance control set to hard left, only the left signal will be sent to odd numbered buses. Similarly, with the balance control set to hard right only the right signal will be sent to even numbered buses. If, for example, you are panning from hard left to center, you will notice a 3dB drop in the left channel as you do so. This “panning law” ensures that signals sound equally loud at all pan positions.

+ 24 hidden pages

Inter-m IMX-824, IMX-832, IMX-840 Operation Manual

Specifications and Main Features

Frequently Asked Questions

User Manual