Lexicon CP-1 - REV 2.0 Owner's Manual
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Lexicon CP-1 - REV 2.0 Owner's Manual

Lexicon CP-1 - REV 2.0 Owner's Manual

Digital audio environment processor
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Panorama Ambience
Reverb
Surround
CP-1
Digital Audio
Environment
Processor
Owner's
Manual

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  • Page 1 Panorama Ambience Reverb Surround CP-1 Digital Audio Environment Processor Owner's Manual...
  • Page 2 1,004,603 and 1,037,877. "Dolby" and the double-D symbol are trademarks of Dolby Laboratories Licensing Corporation. Copyright 1991 Lexicon, Inc., 3 Oak Park, Bedford, MA 01730 USA All Rights Reserved. Telephone: (781) 280-0300 Fax: (781) 280-0490 Patents are pending on the CP-1 Printed in the United States of America Lexicon Part #070-06619 Rev.

  • Page 3: Safety Suggestions

    Safety Suggestions Read Instructions Read all safety and operating instruc- qualified service personnel when: tions before operating the unit. the power supply cord or the plug has been damaged, objects have fallen, or liquid has been spilled into the Retain Instructions Keep the safety and operating instruc- unit, tions for future reference.
  • Page 4 Lexicon...
  • Page 5 CP-1 Digital Audio Environment Processor Owner's Manual...
  • Page 6 Lexicon...

  • Page 7: Table Of Contents

    CP-1 Digital Audio Environment Processor Table of Contents Controls and Indicators Introduction The Front Panel The Rear Panel The Remote Control Connection and Calibration Installation Connections to Other Equipment Setting the Main Input and Output Levels Calibration of the Panorama Program Speaker Set-Up and Configuration Using The Programs To Load, Modify...

  • Page 8: Controls And Indicators

    Controls Indicators CP-1 Digital Audio Environment Processor All of the programs in the Lexicon CP-1 Digital Audio Environment Introduction Processor have a common goal: to draw you, the listener, more deeply into a musical performance or a film. For music the CP-1 uses unique digital processing to re-create either the original recording space or a new one of your choosing.

  • Page 9: The Front Panel

    Controls and Indicators Lexicon The Front Panel exicon DIGITAL AUDIO ENVIRONMENT PROCESSOR C P - 1 SOURCE TAPE POST SYSTEM EFFECT POWER MUTE MUTE INPUT LEVEL BY S URROU N D SOURCE MONITOR TAPE Source The SOURCE buttons select one of two identical stereo pairs of audio inputs.

  • Page 10: The Rear Panel

    Controls and Indicators CP-1 Digital Audio Environment Processor The Rear Panel LEVEL TAPE REAR SIDE MAIN INPUTS OUTPUTS Stereo outputs for rear and side power amplifiers, with level adjusting Rear and Side knobs. The procedure for balancing these outputs (as well as the center Outputs channel and subwoofer) with the main pair begins on page 9.

  • Page 11: The Remote Control

    Controls and Indicators Lexicon The Remote Control PANORAMA BANK NORMAL WIDE BINAURAL AMBIENCE PARAM MEDIUM LARGE SMALL REVERB SMALL MEDIUM LARGE SURROUND MONO STEREO EFFECT BALANCE VOLUME SYSTEM EFFECT DOLBY SURROUND B B Y Y SURROU N D MUTE PRO - LOGIC...
  • Page 12 Controls and Indicators CP-1 Digital Audio Environment Processor Surround The SURROUND programs work with film sound tracks to recreate the theater experience. MONOLOGIC (10) expands the music and effects on monaural films into the additional channels while leaving the dialog in the front center.
  • Page 13 Controls and Indicators Lexicon Page 6...

  • Page 14: Connection And Calibration

    Installation The CP-1 may be installed on a shelf or in a standard 19" equipment rack, using the optional rack-mounting hardware (Lexicon part #021-06639). Connect the power cord to a wall outlet or to a switched outlet on the back of your preamplifier.
  • Page 15 Connection Calibration Lexicon TAPE INTEGRATED AMP, TAPE PREAMP or RECEIVER CENTER MAIN CENTER REAR REAR CP-1 INPUTS AMPS VCR, TV, VIDEO SIDE AUDIO CONTROL CENTER WOOFER SIDE TAPE AMPS OUT/IN Connecting the CP-1 SUBWOOFER in a Tape Monitor Loop CASSETTE DECK...

  • Page 16: Setting The Main Input And Output Levels

    Level. Turn on the CP-1. For the first two seconds the display should read: LEXICON CP-1, with a software version number and a copyright notice. For another two seconds there will be a configuration message, then a program name will appear. When the power-up routine is finished, aim the remote control at the unit and push the EFFECT MUTE button (bottom row, right).

  • Page 17: Output Levels

    Connection Calibration Lexicon Output Levels The output level potentiomenters (the small knobs above the output con- nectors on the CP-1 rear panel) allow you to balance the sound levels of all the channels in your system relative to each other. The most important thing...

  • Page 18: Calibration Of The Panorama Program

    Connection Calibration CP-1 Digital Audio Environment Processor Calibration of the Panorama Program PANORAMA works by canceling the sound going from each speaker to the opposite ear. The effectiveness of the program is highly dependent on the geometry of your front loudspeakers, the room and your listening position. The correct timing of the canceling signal varies with the angle between your main speakers.
  • Page 19 Connection Calibration Lexicon go on to step 6; otherwise, perform step 5. 5. Push PARAM twice so the display reads: SPEAKER ANGLE. If the sweet spot from step 2 (LEFT ONLY) is to the left of the sweet spot from step 4 (Right ONLY), push PARAM UP once.

  • Page 20: Speaker Set-Up And Configuration

    Speaker Set-Up and Configuration CP-1 Digital Audio Environment Processor Configuration Choose the diagram from the Speaker Configuration Chart that corre- sponds to your room and note its number. Press the BANK button and hold it for a few seconds. The display will read: LCD CONTRAST ADJ with a bright bar.
  • Page 21 Speaker Set-Up and Configuration Lexicon Notes on How much power do you need? That depends on a number of variables — How efficient are your speakers? How big is the room? How loud do you Amplifiers play the system? Generally, the demands on the side and rear channels are higher for film sound than for music.
  • Page 22 Speaker Set-Up and Configuration CP-1 Digital Audio Environment Processor If your center channel speaker is smaller than the left and right fronts, increasing BASS BLEND will remove low bass from the center and increase it in the left and right speakers. The center channel is so important that if it is not possible to have an extra center speaker it is frequently better to plug the center output of the CP-1 into the audio input of your video monitor and use its built-in speaker (if it has one) than it is to run the dialog through the...
  • Page 23 Speaker Set-Up and Configuration Lexicon For Music Center Phantom Center Phantom Center Phantom Button IN Button IN Button IN Good Better Best If your main interest is music, you will most likely begin with two high- quality main speakers (Configuration 1). Here the Panorama program alone will add substantial enhancement in spatial impression, image size, image depth and freedom from coloration of central sources.
  • Page 24 Speaker Set-Up and Configuration CP-1 Digital Audio Environment Processor The Subwoofer Output is a monaural signal created by summing the left, Subwoofer Connections right and center outputs, then filtering out frequencies above 100 Hz at a rate of 12 dB per octave. Connecting a subwoofer to the CP-1 rear-panel Subwoofer Output, adds bass energy without removing any from your main speakers.
  • Page 25 Speaker Set-Up and Configuration Lexicon Page 18...

  • Page 26: Using The Programs

    Using the Programs CP-1 Digital Audio Environment Processor To Load, Modify and The CP-1 contains four basic programs: Panorama, Ambience, Reverb and Surround. Each program has three variations which occupy one row on the Store Programs remote control. Pushing one of the buttons numbered 1 through 12 during normal opera- To load a program: tion will load that program.
  • Page 27 The Programs: Panorama Lexicon Panorama Panorama extracts the natural ambience from recorded music and moves it outward from the speakers, producing greater width and depth of image and a feeling of enhanced spaciousness. The program adds no additional sound but expands the existing stereo image. Panorama also works with Dolby Stereo movies, bringing the surround track outward into the room.

  • Page 28: The Programs: Panorama

    The Programs: Panorama CP-1 Digital Audio Environment Processor EFFECT LEVEL sets the amount of crosstalk cancellation, and thus the Effect Level apparent front width. It is the most important user adjustment to Panorama, and has been given its own button on the remote. When EFFECT LEVEL is all the way down, Input Balance, LF Width and the rear outputs are still active.

  • Page 29: Ambience

    The Programs: Ambience Lexicon Ambience Ambience generates the appropriate early reflections for stereo simulation of one of six different halls — one rectangular hall and one fan-shaped hall in small, medium and large sizes — and sends the reflections to the side and rear speakers.
  • Page 30 The Programs: Ambience CP-1 Digital Audio Environment Processor Rolloff ROLLOFF mimics the absorption of the air in the hall and its initial value is therefore more pronounced (the rolloff begins at a lower frequency) the larger the space. Panorama Effect PANORAMA EFFECT adjusts the strength of the signal used to expand the stereo image outward from the front two speakers.

  • Page 31: Reverb

    The Programs: Reverb Lexicon Reverb The Reverberation program differs from Ambience in that it does not simulate the early reflections of specific halls, but emphasizes rich, smooth reverberant decay in small, medium or large spaces. It works well for simulating a space with a long reverberation times relative to its size, such as a reverberant chamber, church or the like.
  • Page 32 The Programs: Reverb CP-1 Digital Audio Environment Processor Mid RT MID RT (Midrange Reverberation Time) is the time required for midrange sounds to decay 60 dB in level. Your choice of small, medium or large synthesized space determines both the initial value and the available range of MID RT.

  • Page 33: Surround

    STEREO LOGIC is meant for playing music through a system whose speakers are laid out primarily for films. PRO LOGIC is Lexicon’s all-digital implementation of the Dolby Pro Logic Surround decoding process. The term Dolby Stereo refers to both movies and equipment used exclusively for theatrical presentation.
  • Page 34 The Programs: Surround CP-1 Digital Audio Environment Processor Stereo Logic Parameter Initial Value Range FRONT EFFECT 0-16 REAR EFFECT 0-16 REAR ROLLOFF 14.1 kHz 329 Hz-14.1 kHz Automatic BASS BLEND 0-16 AUTO AZIMUTH/BAL Off, On REAR DELAY 8 ms 0-32 ms REAR NOISE CHIP Off, On CALIBRATE...
  • Page 35 The Programs: Surround Lexicon Program Parameters cont'd Auto Azimuth/ The AUTO AZIMUTH/BAL parameter should be set to ON for films, OFF Balance for music. When it is on, special digital circuits continually monitor the dialog and adjust both the relative level and time offset of the two channels to keep the dialog properly centered.

  • Page 36: To Rename And Store A Register

    Using the Programs CP-1 Digital Audio Environment Processor To Rename and Store a Register The previous sections describe the CP-1’s four basic programs and all of their variable parameters. Any changes in the parameters of a program in the USER bank will be automatically recorded and stored for future use. USER banks store automatically.
  • Page 37 Using the Programs Lexicon Page 30...

  • Page 38: Troubleshooting

    Troubleshooting CP-1 Digital Audio Environment Processor Troubleshooting If you encounter a problem, please review the items in the following checklist. Also be sure to thoroughly check all other connected components such as speakers, receiver/amplifier/preamp, VCR, TV, CD player, etc. Problem Possible Cause and Solution Make sure INPUT LEVEL on the CP-1 front panel is turned up.
  • Page 39 Troubleshooting Lexicon Problem Possible Cause and Solution Muffled sound in L&R channels When no center channel is used, the rear-panel phantom button must be pushed IN. Center channel sound muffled The center channel amp may be connected to the subwoofer jack on the CP-1 rear panel.
  • Page 40 LCD contrast and Configuration settings, since they will have been reset to factory defaults.) If you cannot solve functional problems through these proce- dures, consult your dealer or Lexicon/Customer Service Depart- ment. DO NOT, UNDER ANY CIRCUMSTANCES, OPEN THE UNIT. DOING SO WILL VOID YOUR WARRANTY, AND MODIFICATIONS MAY RENDER THE UNIT UNSERVICE- ABLE.
  • Page 41 Troubleshooting Lexicon Page 34...

  • Page 42: Theory And Design

    Theory Design CP-1 Digital Audio Environment Processor Lateral Sound Concert Hall Acoustics For decades the study of concert-hall acoustics relied on certain basic measurements to characterize halls, the main one being the time it takes a sound to drop in level (decay) by 60 decibels. This is called the reverberation time or RT and is approximately the same as the time it takes a hand clap to subside to inaudibility.
  • Page 43 The Lexicon CP-1 resolves this deficiency by supplying appropriate signals is cramped, but tolerable. The overall to loudspeakers at the sides of the listener or by modifying signals to the...
  • Page 44 Theory Design CP-1 Digital Audio Environment Processor sides. Both methods depend on having the added sound come from a different direction than the original music, and each method has some advantages. With either method of generating SI there is an additional choice the CP-1 allows the user to make: the sideways energy cues of the original recording can be extracted by the CP-1, or a different hall sound can be generated and supplied from the correct directions.
  • Page 45 Theory Design Lexicon The Panorama Program Loudspeakers placed on either side of the listening position are the most effective and foolproof way to produce added Spatial Impression. Since it is not always possible to have side loudspeakers, the CP-1 uses crosstalk elimination to simulate them when they can’t physically be there.
  • Page 46 Design CP-1 Digital Audio Environment Processor quency. Lexicon’s implementation, called the Panorama program, was designed using measured data on sound diffraction around the head to shape the frequency spectrum of the canceling signal. This signal is then itself canceled by a second signal, and so on, so that both the crosstalk and the...
  • Page 47 Theory Design Lexicon In a well-damped room with loudspeakers mounted on stands away from the walls, the Panorama effect can be very exciting, giving the closest possible approximation to the actual hall used for the recording. With true binaural recordings (made with a modern dummy head with accurate external ears and proper equalization) the playback can be uncannily realistic.
  • Page 48 The reflections were determined by computer ray-tracing using architectural data, augmented by Lexicon’s 15 years of experience with digital concert-hall simulation. The Ambience simulation is done in stereo. Instead of feeding combined left and right channels to the processor, the CP-1 has two input points corre- sponding to instruments placed on the left or right side of the stage.
  • Page 49 Theory Design Lexicon be the sound that comes from the sides. Early research with quadraphonics involved extensive experimentation with speaker placement, and confirmed that additional speakers beside the listener sounded better than the conventional approach of putting pairs of speakers in front and behind. Our research into speaker placement with...
  • Page 50 Theory Design CP-1 Digital Audio Environment Processor music. If you have no side loudspeakers, both Ambience and Reverb contain versions of the Panorama program that will simulate them within a narrow area between the speakers. Choosing one of the speaker configurations with no side speakers (see page 13) will automatically turn the Panorama Effect on and mix the side outputs into the main outputs.
  • Page 51 Theory Design Lexicon The Surround sides to the front, while leaving the side outputs on.) Programs The Surround programs: Mono Logic, Stereo Logic and Pro Logic, are specifically designed for film sound or for systems set up primarily for Mono Logic enhanced film viewing.
  • Page 52 Theory Design CP-1 Digital Audio Environment Processor room simulator has outputs for left, right, side and rear surround speakers. The monaural input sound from the film is unchanged in the center speaker, so that all the dialog and music that the director expected to come from the screen still does, with no modification or reverb.
  • Page 53 Theory Design Lexicon placements. Dolby Surround Decoding When the movie is shown the two Dolby Stereo tracks must be decoded and separated into the original four. The Dolby Surround decoder does this in a rather rudimentary way: it supplies a signal to the center channel which is just the sum of the two input channels.
  • Page 54 Theory Design CP-1 Digital Audio Environment Processor is even more important in a home decoder than in a professional model, because the small size of the playback room makes decoding errors more audible than they are in a theater. The level detection must be very fast, and the matrix must adapt very quickly or there will be a time lag between the audibility of a sound and its correct steering.
  • Page 55 Theory Design Lexicon result is superior steering. An added benefit is that the CP-1 is the only Pro Logic decoder which needs no front panel input balance control; the user need not bother with this adjustment. You can check the quality of the...
  • Page 56 Theory Design CP-1 Digital Audio Environment Processor sounds appear in the front left and right speakers (and the side left and right speakers, if present). The Rear Noise Chip parameter is preset to OFF, meaning that the high- frequency sound in the rear channels is set solely by the Rear Rolloff parameter.
  • Page 57 Theory Design Lexicon sound does not. Occasional extra wide sound effects can seem peculiar at first for being so much wider than the screen but when the mix is good the emotional impact of the wide sound can be very great. The disparity between the size of the video screen and the size of the sound is usually easy to accept, and the added impact is hard to give up once you have heard it.
  • Page 58 Theory Design CP-1 Digital Audio Environment Processor References 1. Schroeder, M.R., Gottlob, D. and Siebrasse, K.F.,"Comparative Study of European Concert Halls: Correlation of Subjective Preference with Geo- metric and Acoustic Parameters", J. Acoust. Soc. Am., vol. 56, pp. 1195-1204 (1974). 2.
  • Page 59 Theory Design Lexicon Page 52...

  • Page 60: Specifications

    85dB min, A-weighted, Ref. 1 kHz max level Voltage: 120V/60 Hz 100V/50-60 Hz 220V/50 Hz 240V/50 Hz Dimensions: 17"W x 12.5"D x 2.5"H Weight: 11 lbs. Optional Equipment: Rack-mount adapter, Lexicon Part# 021-06639 Specifications subject to change without notice. Patents are pending on the CP-1 Page 53...
  • Page 61 Lexicon, Inc. 3 Oak Park Bedford, MA 01730 USA Telephone 781-280-0300 FAX 781-280-0490 Lexicon Part #070-06619 Rev 2.0 Printed in the United States of America...

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