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Linear Acoustic UPMAX2251 User Manual

5.1-channel surround-field synthesizer
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MAX 2251
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5.1-Channel Surround-Field Synthesizer
User Guide

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Summary of Contents for Linear Acoustic UPMAX2251

  • Page 1 MAX 2251 5.1-Channel Surround-Field Synthesizer User Guide...
  • Page 3 MAX 2251 5.1-Channel Surround-Field Synthesizer User Guide Release Date: March, 2005 Software Version: 1.021 and Later Linear Acoustic Inc. Phone: 888-292-3117 (US) FAX: 717-735-3612 email: www.LinearAcoustic.com...
  • Page 4 Linear Acoustic be liable for incidental, special, direct, indirect or consequential damages, or loss of use, revenue or profit even if Linear Acoustic or its agents have been advised, orally or in writing, of the possibility of such damages.

  • Page 5: Table Of Contents

    Linear Acoustic upMAX 2251 User Guide Table of Contents List of Figures ........................vi Chapter 1: Introduction ....................5 Principles of Operation ................. 5 Signals and Levels .................. 7 Downmix Compatibility............... 8 Chapter 2: Connections and Setup ................. 9 Unpacking and Inspection..............9 Installation .....................

  • Page 6: List Of Figures

    Linear Acoustic upMAX 2251 User Guide List of Figures Audio Block Diagram ....................6 Rear Panel ........................10 UPMAX 2251 in a commercial upmixing application ..........14 UPMAX 2251 with Dolby DP572 Dolby E Decoder ..........15 UPMAX 2251 in a live sports application ..............16 UPMAX 2251 in a music awards-type program ............

  • Page 7: Chapter 1: Introduction

    Linear Acoustic upMAX 2251 User Guide Chapter 1: Introduction The Linear Acoustic MAX 2251 produces a 5.1 channel audio signal that is perfect for eventual transmission via Dolby Digital (also known as AC-3) to all consumers. The unit accepts a 2-channel input and “upmixes” it to fill as many of the 5.1 output channels as the user selects.

  • Page 8: Audio Block Diagram

    Linear Acoustic upMAX 2251 User Guide Introduction Mix In Ext Lf Level Mix In Ext Rf Level UPMIXER Main Left Out Lf Main Right Out Rf Main In Lt/Rt Center Center Width 80 Hz Surround Main Mix In Out C...

  • Page 9: Signals And Levels

    Linear Acoustic upMAX 2251 User Guide Introduction Two-channel audio is applied via the Lt/Rt Main Input. The audio is upmixed to pro- duce Left, Right, Center, and Surround signals. The Left and Right outputs of the upmixer are passed unmodified to the Left and Right Main Output.

  • Page 10: Downmix Compatibility

    5.1 to 2-channels in the consumer decoder the signal can be heard in surround by the many consumers that only have a matrix surround decoder. An extremely important design goal of the Linear Acoustic MAX 2251 was that the output be downmix compatible. Not only stereo and surround, but also mono- and it had to sound good in 5.1! A tall order that has been satisfied.

  • Page 11: Chapter 2: Connections And Setup

    • Warranty information: Fill out and return the postage-paid warranty card (please) to Linear Acoustic to ensure your software and documentation are kept up to date. • Bag containing one power cord (style matches country unit is shipped to), a handy “sharpie”...

  • Page 12: Rear Panel

    Linear Acoustic upMAX 2251 User Guide Connections and Setup Rear Panel The rear panel of the MAX 2251 contains its electrical I/O. WARNING: Before applying power, check the Voltage Selector switch. 2.3.1 Connection Ports All of the MAX 2251’s connections are on the rear panel and are described in detail below.

  • Page 13: Front Panel

    Linear Acoustic upMAX 2251 User Guide Connections and Setup • AES REF: Connect an AES plant reference signal to this connector (not a video or word clock reference). The signal may be an AES Black or AES signal containing audio.
  • Page 14 Linear Acoustic upMAX 2251 User Guide Connections and Setup The red reset switch on the right is included in case the unit experiences power dis- turbances or incorrect shutdown (i.e. pulling the plug) and enters protection mode. This mode causes the unit to stay in bypass and remain unpowered until someone opens the door and briefly pushes the reset switch.

  • Page 15: Chapter 3: Applications

    Cable and satellite facilities may find it useful as the distribution and transmission sections are usually very close together. For terrestrial emission (transmission) appli- cations such as at DTV stations, the Linear Acoustic OCTiMAX 5.1 may be a more appropriate choice as it contains requisite dynamic range processing and additional useful features such as voice-over.

  • Page 16: Two-Channel Commercials And Interstitial Programming

    Linear Acoustic upMAX 2251 User Guide Applications 3.1.1 Two-Channel Commercials and Interstitial Programming One of the largest complaints viewers of digital and high definition television pro- gramming is the annoying fact that stereo commercials don’t seem to “fit” into the 5.1-channel program.
  • Page 17 Linear Acoustic upMAX 2251 User Guide Applications Note that the two channel material is simply input to the MAX 2251 and a 5.1 channel signal is available at the output. Either of the Commercial or Music presets can be chosen, and are explained in detail at the end of this chapter.

  • Page 18: Sporting Events

    Linear Acoustic upMAX 2251 User Guide Applications 3.1.2 Sporting Events Figure 3-3 shows how a sporting event with a stereo mix, a stereo “natural” or ambi- ence mix, and an optional dry announcer mix can be easily combined into a very con- vincing 5.1-channel program.

  • Page 19: Factory Presets

    Linear Acoustic upMAX 2251 User Guide Applications Standard Two-Channel Mix Linear Acoustic (LtRt or Stereo) MAX 2251 Main Out Main Input Lf/Rf Lt/Rt Main Out 5.1 Channel C/LFE Main Output (Optional) Mix Input A-to-D Main Out Converter C/LFE Ls/Rs Announcer...
  • Page 20 Linear Acoustic upMAX 2251 User Guide Applications MAX 2251 ships with the following factory presets: • Reference Settings - Stock settings, a good place to start from scratch as all set- tings are in a reasonable “detent” position. Start here if you are unsure.

  • Page 21: Chapter 4: Menus

    Linear Acoustic upMAX 2251 User Guide Chapter 4: Menus This chapter discusses how to use the front panel LCD interface to access the menus. Most of it is rather obvious, and a bit of experimentation will quickly make you com- fortable navigating through the submenus.

  • Page 22: Modify Processing Menu; Scroll Down To Access Ext L/R Mix (As Shown On Right Menu)

    Linear Acoustic upMAX 2251 User Guide Menus Figure 4-2 Modify Processing menu; scroll down to access Ext L/R Mix (as shown on right menu) The Modify Processing menu is broken into four major sections, Center channel controls, Low Frequency Effects (LFE) channel controls, Surround controls, and Left Front/Right Front (Lf/Rf) controls.

  • Page 23: Setup Menu

    Linear Acoustic upMAX 2251 User Guide Menus Surround: • Surround Width (not presently active): controls how much separation is produced be- tween the Left Surround (Ls) and Right Surround (Rs) outputs of the upmixer, where 100% means maximum separation and 0% means minimum separation (i.e. mono); De- fault: 0% (fixed) •...
  • Page 24 Linear Acoustic upMAX 2251 User Guide Menus changing a password (if one has been set). Below are detailed descriptions of these submenus: I/O Options gives access to enable the upmixing process, add additional delay to the outputs, and for muting individual channels. Note that GPI control will override up- mix on/off and certain channel mutes.

  • Page 25: Save Preset Menu Before (Left) And After (Right) Saving

    Linear Acoustic upMAX 2251 User Guide Menus • Pink Noise – Equal energy-per-octave noise • White Noise – Equal level-per-octave noise • Brown Noise – Low-pass-filtered noise • Brown Nose – Try it (can’t be serious all the time- we’d crack) •...

  • Page 26: System Info

    Linear Acoustic upMAX 2251 User Guide Menus CAUTION:The system allows overwriting the factory stored presets, please rename! 4.1.3 System Info The System Info menu provides the following statistics: • Firmware Version • CPU Usage – Normally around 20% • Buffer Size •...

  • Page 27: Lock Front Panel

    Linear Acoustic upMAX 2251 User Guide Menus 4.1.5 Lock Front Panel Select this menu to lock the front panel (funny enough).
  • Page 28 Linear Acoustic upMAX 2251 User Guide Menus...

  • Page 29: Chapter 5: Specifications

    Linear Acoustic upMAX 2251 User Guide Chapter 5: Specifications Table 5-1 Electrical Specifications Sampling Rate 48 kHz ( 0.1%), 44.1 kHz ( 0.1%) Main (1-6):14 ms (min.), adjustable up to 500 ms Output Delay LtRt (7-8): 14 ms (min.), independently adj. up to 500 ms...
  • Page 30 Linear Acoustic upMAX 2251 User Guide Specifications Table 5-2 Mechanical Specifications Dimensions 5.25 24 in (13.3 48.3 61 cm) Net Weight 25 lb (12.6 kg) approx. Shipping Weight 32 lb (15.75 kg) approx. Power Requirements 115/220 VAC, switchable, 50–60 Hz...
  • Page 31 Linear Acoustic upMAX 2251 User Guide Specifications Metadata Input Port 9-pin female D-connector with full-duplex RS-485 protocol running at 115 kbps. Pi- nout is compatible with SMPTE 207M. Table 5-4 Metadata Input Port Pinout Connection Shield TX A asynchronous data out –...
  • Page 32 Linear Acoustic upMAX 2251 User Guide Specifications Ethernet Port The Ethernet port is a standard RJ-45 female connector that supports 10 or 100BASE-T. GPI/O Parallel Control Port TTL level controls, active Low. GPI A and B are held low to activate their assigned function, while GPI 1-6 require momentary contact to ground to activate their func- tions.
  • Page 33 Linear Acoustic upMAX 2251 User Guide Specifications Lt/Rt + 7/8 Analog Output 25-pin female D-connector. Uses similar pinout as DA-88 connector except that channel 4 has been replaced by an unbalanced AES digital output, and channels 2, 5, and 6 are not used.
  • Page 34 Linear Acoustic upMAX 2251 User Guide Specifications...

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