Peavey MM-8802 Owners Manual

MM™-8802

MediaMatrix

Break-out-Box (BoB)

User Manual

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.

Intended to alert the user of the presence of important operating and maintenance (servicing) instructions in the literature accompanying the product.

CAUTION: Risk of electrical shock — DO NOT OPEN! CAUTION: To reduce the risk of electric shock, do not remove cover. No user serviceable parts inside. Refer

servicing to qualified service personnel. WARNING: To prevent electrical shock or fire hazard, do not expose this appliance to rain or moisture. Before

using this appliance, read the operating guide for further warnings.

Este símbolo tiene el propósito, de alertar al usuario de la presencia de “(voltaje) peligroso” sin aislamiento dentro de la caja del producto y que puede tener una magnitud suficiente como para constituir riesgo de descarga eléctrica.

Este símbolo tiene el propósito de alertar al usario de la presencia de instruccones importantes sobre la operación y mantenimiento en la información que viene con el producto.

PRECAUCION: Riesgo de descarga eléctrica ¡NO ABRIR! PRECAUCION: Para disminuír el riesgo de descarga eléctrica, no abra la cubierta. No hay piezas útiles dentro.

Deje todo mantenimiento en manos del personal técnico cualificado. ADVERTENCIA: Para evitar descargas eléctricas o peligro de incendio, no deje expuesto a la lluvia o humedad

este aparato Antes de usar este aparato, Iea más advertencias en la guía de operación.

Ce symbole est utilisé dans ce manuel pour indiquer à l’utilisateur la présence d’une tension dangereuse pouvant être d’amplitude suffisante pour constituer un risque de choc électrique.

Ce symbole est utilisé dans ce manuel pour indiquer à l’utilisateur qu’il ou qu’elle trouvera d’importantes instructions concernant l’utilisation et l’entretien de l’appareil dans le paragraphe signalé.

ATTENTION: Risques de choc électrique — NE PAS OUVRIR!

ATTENTION: Afin de réduire le risque de choc électrique, ne pas enlever le couvercle. Il ne se trouve à l’intérieur

aucune pièce pouvant être reparée par l’utilisateur. Confiez I’entretien et la réparation de l’appareil à un réparateur Peavey agréé.

AVERTISSEMENT: Afin de prévenir les risques de décharge électrique ou de feu, n’exposez pas cet appareil à la pluie ou à l’humidité. Avant d’utiliser cet appareil, lisez attentivement les avertissements supplémentaires de ce manuel.

Dieses Symbol soll den Anwender vor unisolierten gefährlichen Spannungen innerhalb des Gehäuses warnen, die von Ausreichender Stärke sind, um einen elektrischen Schlag verursachen zu können.

Dieses Symbol soll den Benutzer auf wichtige Instruktionen in der Bedienungsanleitung aufmerksam machen, die Handhabung und Wartung des Produkts betreffen.

VORSICHT: Risiko — Elektrischer Schlag! Nicht öffnen! VORSICHT: Um das Risiko eines elektrischen Schlages zu vermeiden, nicht die Abdeckung enfernen. Es befinden

sich keine Teile darin, die vom Anwender repariert werden könnten. Reparaturen nur von qualifiziertem Fachpersonal durchführen lassen.

ACHTUNG: Um einen elektrischen Schlag oder Feuergefahr zu vermeiden, sollte dieses Gerät nicht dem Regen oder Feuchtigkeit ausgesetzt werden. Vor Inbetriebnahme unbedingt die Bedienungsanleitung lesen.

GENERAL CAUTIONS AND WARNINGS!

To prevent electrical shock or potential fire hazards, do not expose the MM

™

-8802 to moisture or rain.

Before using this product, read the user manuals for further warnings and cautions.

The following cautions should be carefully observed when installing, wiring or using this product:

DO NOT use any other power supply or cable other than the one provided with this unit.

DO NOT use solvents or other cleaners to clean the unit. Basic external care requires only a damp cloth. Disconnect the power supply cord before cleaning.

Take care when removing the top cover of the unit. Adjustment of internal components should be performed by qualified technical personnel only! Remove the power cable prior to opening the unit.

Read all safety and installation instructions and retain all documentation for further reference.

The MM-8802 should be installed so that its mounting position does not interfere with proper ventilation.

This product should not be installed or placed near a source of heat.

Power supply cords and associated connectors should be unplugged from the power source when the unit is not used for long periods of time, or will be stored.

If this product is to be mounted in an equipment rack, install rear support if required by the rack manufacturer.

Care should be taken to ensure that the installation is clear of possible sources of contamination. Make sure that the product’s ventilation openings are not exposed to possible sources of liquid, gases, or other contaminants.

This product should be inspected by a qualified service technician if the power supply cord or connector has been damaged, if the unit has been dropped, or if a foreign substance has gained access to the interior electronic and electrical components.

The information contained in this manual is subject to change without notice. Peavey Electronics is not liable for improper installation or configuration. The information contained herein is intended only as an aid to qualified personnel in the design, installation and maintenance of engineered audio systems. The installing contractor or end user is ultimately responsible for the successful implementation of these systems.

All creative content, including but not limited to, specifications, layout design, artwork, photography, drawings, illustrations and logos are Copyright © 2001 Peavey Electronics Corporation, all rights reserved, except where noted. MediaMatrix

; MM™; the stylized Delta logo; the MediaMatrix computer logo; the "fast forward", stylized Peavey logo and the Architectural Acoustics brand name are registered trademarks of Peavey Electronics. Un-authorized duplication or distribution is prohibited by law. This manual was designed, written, formatted, pre-press and printed in Meridian, Mississippi, USA. 2001.

Manual by WR.

Pag e 4

Caution!

Thank You!

What’s In The Box?

Description

Features

Assumptions

Installation

Input Devices

Rotary Control

External DC Power Supply

Logic Output Ports

Using Logic Output Ports with LEDs

Using Logic Output Ports With High Current Devices

Hardware vs. Software Devices

Basic MediaMatrix®Connections

Control Voltage (CV) Input Ports

Control Voltage (CV) Connection Examples

Gain Structure

MM-8802 Software Control Device

20-21

MediaMatrix Software Input & Output Wiring Block Devices

22-23

Panel Features

24-25

The Test View

Audio Inputs

MM™-8802 User Manual

Software Devices for Control Ports

Calibrating CV Inputs

Fault Contacts

Switch

Audio

External Control

Setting Full-Scale Input Sensitivity

MediaMatrix®, Meters & the MM-8802

Setting Full-Scale Output Drive

Adjusting Full-Scale Settings in Legacy Mode

Signal Flow

Products

Pag e 5Peavey Electronics Corporation

Table Of Contents

The Legacy Connection

Category 5 (CAT 5) Cabling & Terminations

40-41

Technical Support

Warranty Registration

Frequently Asked Questions (FAQ)

Specifications

44-45

Warranty Statement

The digital audio transport devices and their control panels (Fig. 2)

Recommended Test View Configuration (Fig. 3)

MM-8802 Control Device Features

20-21

Input & Output Wiring Block Device Features

22-23

Panel Features

24-25

Basic MediaMatrix®Connections

Illustrations

Audio Termination, Step by Step

Control Voltage (CV) Input Connections (Fig. 4)

Control Voltage (CV) Circuit (Fig. 5)

Control Voltage (CV) Input Switch Interface Example

Control Voltage (CV) Rotary Control Interface Example

External DC Power Supply Interface Example

Logic Output Port Connections (Fig. 6)

Logic Output Circuit (Fig. 7)

Using Logic Ports & LEDs

Using Logic Ports with High Current Devices

CV Input Values & TTL Logic Output Toggle Buttons (Fig. 8)

CV Input Calibration Controls (Fig. 9)

TTL Logic Output connections and control buttons (Fig. 10)

Calibrating Control Voltage (CV) Inputs, Step by Step

Fault Contacts

Category 5 (CAT 5) Wiring Details

DIP Switch Configuration

Input Devices

Index

47-49

The MM™-8802 control block components and the physical hardware (Fig. 1)

Signal Flow& Meters

11, 18

CAUTION!

The MM-8802 is designed to work in conjunction with MediaMatrix®brand products. The digital interface between the MM8802 and the MediaMatrix product is a crucial link in the successful implementation of your system. Use only high quality Category 5 cables when using the MM-8802 with the MM DSP-RJ DPU card or the X-Frame

™

88 digital processor. If you are using the legacy MM DSP DPU card, you must use the Peavey 9-pin DB-9 legacy cable only. The MM-8802 will not perform properly if other 9-pin cables are used with the legacy products. Installing the MM-8802 with inferior or improper cables could also cause damage to the components in your sound system. Peavey will not be held liable for damage to components or transducers caused by improper use of interface cabling when using MediaMatrix products.

Like other electronic systems, the infrastructure is critical for implementing large systems that transverse large distances. It is important that your conduit systems, wire plants and connector complement are properly designed and installed. The wiring and cabling systems should be thoroughly inspected and each run certified to pass the specified bandwidth prior to the installation of any active electronic component. Failure to implement proper cabling systems may cause your system to perform at inferior levels.

Several associated products are required to complete a working system using the MM-8802. This manual frequently makes reference to these products, but does not provide specific configuration or installation information on them. Please refer to the manuals for these products for information. Every product, both Peavey products and third party devices, must be properly installed for the MM-8802 to operate in accordance with its published specification.

This product is fan-cooled with an exhaust fan on one side of the unit. Air is drawn inward from the other side. Do not block the fan or any vents when installing this product. Proper cooling is essential to maintain proper operation and long-term stability in this product. Install this product in EIA approved equipment racks only.

The illustrations, drawings and renderings contained herein are NOT drawn to scale.

MM™-8802 User Manual

Welcome

Pag e 7Peavey Electronics Corporation

Thank You!

Thank you for purchasing the MM™-8802 Break-out-Box or "BoB" for MediaMatrix

digital audio processing systems. The MM-8802 represents the latest in state-of-the-art audio technology for fixed commercial audio installations.

This manual was written to provide as much information as possible for your new Peavey Architectural Acoustics product. It is our sincere desire that you enjoy your purchase.

We feel that the best way to fully enjoy any purchase is to have an in-depth understanding of the product’s features, functionality and performance characteristics. We hope that this manual, along with the manuals of our other products, will provide this. If you require additional information that this manual does not provide, please let us know. We are always looking for better ways to provide information about our products, and your input is always appreciated.

If you have a comment about this manual, or would like to make a suggestion, please write to: Peavey Electronics Corp., Architectural Acoustics Division, 711 A St., Meridian, MS 39301. Thank you again for using Peavey!

What’s In The Box?

The MM-8802 is packaged in a single container. This container includes the following items:

1- MM-8802 Break-out-Box 1- IEC removable power supply line cord

(120VAC Domestic, 230VAC Export) 17- 3-screw Euro connectors* 2- 16-screw Euro connectors* 1- User Manual/Literature Package 1- Warranty Card

* These items are shipped installed on the MM-8802

If any of these items are missing, please contact your authorized Peavey Architectural Acoustics contractor/dealer or the factory.

Products

This manual covers the MM-8802 Break-out Box for MediaMatrix brand products. The MM-8802 replaces the following products:

MM-8830 Break-out-Box MM-8840 Break-out-Box MM-8848 Break-out-Box

The functionality provided by these legacy products is provided in the new MM-8802, as well as many additional features and improved performance. The MM-8802 is designed to be seamlessly integrated with these products and all MediaMatrix brand products.

MM™-8802 User Manual

Description

Following on the heels of the original MM-8800 Series products, the new MM-8802 represents a significant improvement in audio performance, control functionality, monitoring, installation and cost. New advances in processing and control technology make the MM-8802 the most reliable breakout-box yet. The MM-8802 is designed to work seamlessly with all MediaMatrix

and Architectural Acoustics®products. We are confident that you will find the MM-8802, as well as other Architectural Acoustics products to be of the highest quality available.

The MM-8802 features a new single rack space package with several new and improved features. This 24-bit audio product provides the very best audio performance for MediaMatrix systems and a large array of control features, monitoring and installation benefits. Using state-of-the-art technology and advanced audio converters make the MM-8802 one of best values in the commercial digital audio market.

Designed for high end, fixed-install engineered audio systems, the MM-8802 includes functionality designed for the system designer. These new features make large scale system design, engineering and implementation easier than ever. Among the many features included with the MM-8802 are control logic inputs, logic outputs, fault monitoring, CAT 5 DSP interface and a new single space package featuring front panel metering of audio inputs and outputs. New software control of analog circuitry makes gain management easier and puts control of analog, as well as digital audio, on the desktop.

With a state-of-the-art, studio grade analog section and 24-bit converters, the MM-8802 provides an extremely high performance vs. cost ratio. With integral control ports and support for the legacy MediaMatrix interface, the MM-8802 is a solid, feature-loaded value.

Features

Assumptions

Single EIA rack space package Forced air cooling 24-bit converters Universal sample rate support Eight line level audio inputs (mic or line capable) Software selectable input sensitivity Eight line level audio outputs Software selectable full-scale output level Eight Control Voltage (CV) control inputs Eight TTL logic outputs Independent fault monitoring dry contacts Front panel audio metering Front panel status monitoring Category 5 cabling interface New 50' cable distance Legacy cable support Universal power supply

The MM™-8802 is a very powerful tool. Ease of use, external control options, and a powerful interface make the MM-8802/MediaMatrix

combination perfect for any application, including:

- Theme Parks

- Presentation Rooms

- Board Rooms

- Houses of Worship

- Courtrooms

- Auditorium/Cafetorium

- Lecture Hall Sound Reinforcement

- Meeting Rooms

- Convention Centers

- Stadiums

- Arenas

- Paging

- Background Music

- Retail Spaces

- Restaurants

- Live Performance Venues

The new features, performance advantages and functionality included in the MM-8802 make this product one of the best audio values available. From simple X-Frame

™

systems with basic audio requirements, to full blown, multiple-frame MediaMatrix systems, the MM-8802 is an excellent choice.

The MM-8802 is designed for basic and advanced MediaMatrix systems. It is assumed that you have a working knowledge of MediaMatrix hardware and software, computers and basic Microsoft Windows navigation. If you do not have this knowledge, please refer the configuration and installation of this product to qualified personnel. For indepth information on MediaMatrix, refer to the online help.

Features

Pag e 9Peavey Electronics Corporation

Installation

The MM-8802 is designed to be installed in commercial grade, EIA electronic equipment racks only. Installing this unit in non-EIA racks or in other configurations is not recommended. Failure to install this product in the proper enclosure may void your warranty.

The MM-8802 is forced-air cooled, and care should be taken not to block the air intake or exhaust path. When installed in EIA racks, the MM-8802 can be installed in adjacent rack spaces without additional venting. However, it is recommended that common sense be applied to large installations where multiple units are mounted in a single rack. It is generally accepted that a ratio of one vent for every two MM-8802s is a good rule of thumb that usually provides adequate performance. In installations where adverse conditions exist, and room temperatures are likely to rise, additional vents should be installed.

The MM-8802 can be installed into any EIA rack with an internal depth clearance of 24" or more. This will allow plenty of space for the unit and its associated wiring harness. When dressing off wiring harnesses, take care with CAT 5 cables. Do not tie-wrap bundles of CAT 5 wire too tightly. Leave plenty of room for bends, allowing the cable to progress naturally from the RJ-45 connector. Creating tightly wrapped CAT 5 wire bundles can cause loose crimp joints and defective terminations.

To successfully install your new MM-8802, and perform the testing examples contained in this manual, you will need the following components:

In MediaMatrix, the minimum configuration consists of a single DPU processing engine (X-Frame or frame/DSP card combination), and I/O. Depending on your system, this may consist of several products. When using the MM-8802, at least one unit is required to configure the minimum system. Of course, most systems will include more DPU products and multiple MM-8802s, but this is the most basic configuration.

The use of high quality, network grade CAT 5 cables is required to successfully implement the MM-8802 with new MediaMatrix products. Please refer to the section on CAT 5 cabling later in this manual.

MM™-8802 User Manual

A MediaMatrix®X-Frame™, X-Frame 88, MiniFrame 108nt or 208nt, MM760nt, MM-960nt or MM-980nt Mainframe.

MWare

™

3.1.2, X-Frame 88 2.0 or later software.

PC monitor, mouse and keyboard. For use with the X-Frame products, a separate personal computer running Windows

95, 98, ME, NT 4.0

w/SP6 or Windows 2000 Professional is required.

For frame-based MediaMatrix systems, you will need at least 1 MM DSPRJ or MM DSP DPU card.

Two CAT 5 cables are required for each MM-8802.

An audio source, power amplifier and loudspeaker.

•

Signal Flow

Pag e 11Peavey Electronics Corporation

Signal Flow

Signal flow is the basis for all audio system design. You cannot design and implement integrated audio systems without understanding the basics of signal flow, and how audio is transported between components. It is essential to all aspects of installation and maintenance. With the MM

™

-8802, it is equally important. You should understand the various stages of signal flow

within the MediaMatrix

system to accurately and efficiently configure, adjust, control and maintain the system.

As with all MediaMatrix systems, audio is separated into several fundamental processes. First, there is analog audio, real-world waveforms that are a part of our everyday lives. This is what we hear and speak. Then there is digital audio. Code that represents “samples” of actual analog audio signals. This we cannot hear. And there is the conversion process. Audio must be converted from analog waveforms to digital code and then converted again, back to analog for use in our acoustic world. Look carefully at the illustration below.

In the above example, stereo audio from the CD player gets into and out of the MediaMatrix system via the MM-8802. First, your CD player’s output is connected to the MM-8802’s input. The signal then passes the MM-8802’s analog gain stage and gets converted to digital audio via the analog to digital converter (A/D). When the signal is past, or “after” the A/D converter, it is in the digital domain. After the converter, it exits the MM-8802 via the TX side of the CAT 5 digital interface cable and enters the MediaMatrix DSP. The two audio channels, left and right from the CD player are then “inside” the MediaMatrix digital processing engine or DPU. You use “wire” and audio “devices” to create any signal flow you desire for your CD audio signal. You can split it, process it, mix it, switch it, squash it, loop it, delay it...whatever you need to do, you can do with MediaMatrix. In this example, we have a stereo mixer, stereo compressor and stereo parametric EQ. The signal exits the DPU at the BoB output block. After the signal is processed, it exits the MediaMatrix system and returns to the MM-8802 via the RX side of the CAT 5 interface cable. It then hits another conversion stage, this time a digital to analog converter (D/A) where the digital signal data is returned to analog waveforms. It then goes through a final analog gain stage then shows up at the output terminal of the MM-8802. It is this terminal that gets connected to the next component in your audio system, most often, the power amplifier. (NOTE: When using the 9-pin legacy cable for interfacing the MM-8802, the TX and RX circuits are contained within a single cable.) Notice that the MM-8802 has several software control panels attached to it. There is the master control panel that includes all of the analog audio and external control interface functionality for the MM-8802. There are also control panels attached to the input and output block within the MediaMatrix DPU. Understanding these control panels is vital to good MediaMatrix implementation.

Analog to Digital

Converter

“Inside” the MediaMatrix.

Digital audio domain.

The DSP

MM-8802 Break-out-Box

Analog

Gain Stage

Analog Control

Digital Control

Digital to Analog

Converter

Analog

Gain Stage

External

Control Ports

Output

Drive Level

Input

Sensitivity

Analog audio components

INPUT

OUTPUT

MM™-8802 User Manual

Hardware vs. Software Devices

The MM-8802 is an integration of physical hardware and software. In software, the MM-8802 is represented by several “devices” within the MediaMatrix

MWare™application. These devices include the Control Block, the Input Block and the

Output Block. For proper operation of this product, a thorough understanding of these devices is required.

There is a very basic relationship between the MM-8802 physical product and its accompanying software devices. Of these three devices, one is the “control panel” for the hardware. There are no physical controls on the MM-8802 itself, so all functions for it are accessible only from its software based control panel (except for legacy mode DIP switches, see page 19). This control panel can be found under the Input/Output section of the Device Menu. The figure below illustrates the relationship between the MM-8802 and its software control device.

The second half to this equation is the audio transport. The concept of audio I/O is an extremely important part of configuring MediaMatrix systems. It is the “wire” that gets audio into, through and out of the system. Within MediaMatrix, this process is represented by two I/O blocks with “nodes” on them. These represent the actual input and output points for the system. In the figure below, you can see the two audio blocks. The one with the nodes on the right of the block is an audio “input” block. In other words, audio from the outside of the system enters the DSP at these nodes. The one with the nodes on the left side of the block is an audio “output”. It is at this point where digital audio exits the system. Each of these blocks also has its own control panel. These control panels include level controls and mute buttons for the each audio channel in the digital domain.

Fig. 1, The MM-8802 control block components and the physical hardware.

Fig. 2, The digital audio transport devices and their control panels.

Input Side of

Audio Path

Digital Input

Control Panel

Digital Output

Control Panel

Output Side of

Audio Path

Hardware & Software Basics

Pag e 13Peavey Electronics Corporation

The Test View

In order to properly use this manual, it is recommended that a basic MediaMatrix®view file be configured. This view file should have a minimum number of components and should be configured to install and test a single MM

™

-8802. Eventually however, your view will include many units, and should match exactly your specific system requirements. The following figure is a good example of such a “test” file.

Again, it is very important to understand the relationship between the MM-8802 hardware, the outside audio path and the digital audio path within MediaMatrix. Audio enters and exits the MediaMatrix system at the wire blocks and travels within the MediaMatrix system digitally. The wires represent this audio path within the MediaMatrix system.

Remember, the BoB Control Block includes only the analog audio controls for the MM-8802, while the wiring blocks include the digital audio controls. Both of these control sets are critical to the proper operation of your sound system. Refer to the signal flow block diagram on page 11 for details on this signal flow.

Fig. 3, Recommended Test View Configuration

BoB Control Block

MM-8802 Audio

Output Device

MM-8802 Audio

Input Device

Audio from the “outside”

enters the MediaMatrix

system here.

These wires carry

digital audio within

the MediaMatrix

system

Audio to the “outside”

exits the MediaMatrix

system here.

MM™-8802 User Manual

Audio Inputs

The MM-8802 includes functionality that supports a new modular input architecture. This architecture provides the ability to configure the MM8802’s analog inputs for either microphone or line-level operation. Two internal module bays provide connection to factory installed input modules. These modules consist of the MM-Line 4, which provides four analog line level inputs and the MM-Mic 4, which provides four analog microphone level inputs. A total of two modules are installed at the factory on the MM-

8802. Which modules are installed is up to you!

MM-Line 4

The MM-Line 4 input card includes four line level inputs and installs into slot 1 or slot 2 of the MM-8802 input section. The MM-Line 4 includes full software control of input sensitivity and analog gain. It is possible to install one or two MM-Line 4 modules into the MM-8802.

MM-Mic 4

The MM-Mic 4 input card includes four mic or line level inputs and installs into slot 1 or slot 2 of the MM-8802 input section. The MM-Mic 4 features studio grade microphone preamplifiers, complete with software controllable phantom power and gain controls for each channel. It is possible to install one or two MM-Mic 4 modules into the MM-8802.

With these new modules, the MM-8802 can be configured in a variety of different ways.

• 8 line inputs, 8 line outputs

• 8 mic inputs, 8 line outputs

• 4 mic inputs, 4 line inputs, 8 line outputs

By making the inputs modular, the MM-8802 provides even greater flexibility and makes for much more cost-effective system design.

Inputs

Pag e 15Peavey Electronics Corporation

Input Devices

When looking at the rear panel of the MM™-8802, you can see which module is installed by noting the color of the input connector header. The header for the MM-Line 4 is black, while the header for the MM-Mic 4 is green. The MM-8802’s software control module will indicate which card is installed by illuminating either a “Mic” or “Line” LED on the software control device in the MediaMatrix software. (See page 20). If the “None” LED on the software control module is illuminated, it means that there is no input module present. At the time of this printing, there is no option for using an MM-8802 without any input modules installed. If this LED is illuminated, it may indicate an unsuccessful installation of the input module.

Input Connector Header

Input Channels 1-4

Shown installed with

MM-Line 4 input module

(Black header)

Input Connector Header

Input Channels 5-8

Shown installed with

MM-Mic 4 input module

(Green header)

Software control panel showing a suc-

cessful installation of an MM-Line 4 in

the input bay for channels 1-4.

Software control panel showing a successful installation of an MM-Mic 4 in

the input bay for channels 5-8.

Software control panel showing an

unsuccessful installation OR absence of

any input module for channels 5-8.

MM™-8802 User Manual

Gain Structure

Gain structure is among the most important, often debated and misunderstood topics in the audio industry. For years, engineers have disagreed with each other about proper levels, gain I/O, meters and other issues that affect the way we work. When digital audio came into the mainstream, the topic’s confusion was only compounded, and today, few fully understand the inner workings of gain structure. This is true within MediaMatrix

as well.

Although this manual does not present an exhaustive discussion on the topic, it is important to understand the basics of gain structure, and how it relates specifically to the MM-8802.

When the MM-8802 was designed, several important issues regarding the gain structure of its input and output sections were carefully considered. There were performance issues, interface, ease of use and compatibility issues that played a big part in how the product was eventually designed.

In order to provide support for the thousands of MediaMatrix systems already installed, the MM-8802 was designed with a unique contrast of old and new. Essentially, the MM-8802 operates in one of two modes, “New” or “Legacy” mode. These modes of operation extend to many facets of the MM8802’s functionality, but most significantly to the management of its gain structure.

When running in New mode, the MM-8802 includes functionality that supports software control of all analog settings when using current (MWare

™

V3.1.2 or X-Frame™88 V2.0, or higher) software. When running in Legacy mode, that is, systems that are running older software, the adjustments of Full-Scale Input Sensitivity and Full-Scale Output Drive levels are adjustable from internal DIP switches. In this mode, the MM-8802 acts just like a legacy BoB.

The legacy BoB models (MM-8830, MM-8840, MM-8848) did not include support for software-based analog gain control. The only adjustments that could be made were by internal jumpers for Full-Scale Input Sensitivity and Full-Scale Output Drive level. And, because real-world conditions prevent a universal standard, it was possible that the factory settings would not be appropriate for many projects. The likelihood was that, sooner or later, a contractor would have to open the unit to adjust the analog settings.

It is very important to understand that it is the software that determines what mode the MM-8802 is operating in, NOT the

interface connector. The new software includes support for control of the Full-Scale Input Sensitivity and Full-Scale Output Drive settings directly from the control panel as well as input and output analog gain (trim). When these software controls are available, all internal hardware switches are bypassed.

The software controls are explained on page 21. For legacy operation, you will need to use the MM-8802’s internal DIP switches to adjust analog FullScale Input Sensitivity and Full-Scale Output Drive levels.

+ 35 hidden pages

Peavey MM-8802 Owners Manual

Specifications and Main Features

Frequently Asked Questions

User Manual

Table of Contents

Illustrations

CAUTION!

Thank You!

Products

Description

Features

Assumptions

Installation

Signal Flow

Hardware vs. Software Devices

The Test View

Audio Inputs

Input Devices

Gain Structure