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Lexicon CP-1 Owner's Manual

Digital audio environment processor
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Panorama Ambience
Reverb
Surround
CP-1
Digital Audio
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Owner's
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Summary of Contents for Lexicon CP-1

  • Page 1 Panorama Ambience Reverb Surround CP-1 Digital Audio Environment Processor Owner's Manual...
  • Page 2 Unpacking and Inspection After unpacking the CP-1, save all packing materials in case you ever need to ship the unit. Thoroughly inspect the CP-1 and packing materials for signs of damage. Report any shipment damage to the carrier at once; report equipment malfunction to your dealer.

  • Page 3: Safety Suggestions

    Read Instructions Read all safety and operating instruc- tions before operating the unit. Retain Instructions Keep the safety and operating instruc- tions for future reference. Heed Warnings Adhere to all warnings on the unit and in the operating instructions. Follow Instructions Follow operating and use instructions. Heat Keep the unit away from heat sources such as radia- tors, heat registers, stoves, etc., including amplifiers which produce heat.

  • Page 4: Table Of Contents

    CP-1 Digital Audio Environment Processor 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 Calibration of the Speaker Set-Up and Configuration Using The Programs...

  • Page 5: Controls And Indicators

    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 6: The Front Panel

    CD player. The MONITOR button selects SOURCE I/II or TAPE IN. The Tape inputs are provided to accommodate a recorder if the CP-1 occupies a previously used tape monitor loop.

  • Page 7: The Rear Panel

    Surround programs to malfunction. Inputs and outputs for an additional audio or video tape deck (audio portion only) or to replace the monitor loop occupied by the CP-1. Two sets of main inputs, selected by the SOURCE I/II buttons. The Rear Panel...

  • Page 8: The Remote Control

    The REVERB programs, like AMBIENCE, simulate rooms of three sizes with the aid of side and rear channels. These programs have fewer specific initial reflections than AMBIENCE but richer and smoother reverberant decay. REVERB is especially good for simulating large, highly reverberant spaces. Lexicon BANK BINAURAL PARAM LARGE...
  • Page 9 PARAM can also put the CP-1 into TEST mode. (See page 19.) EFFECT: UP and DOWN adjust the level of all signals added by the CP-1. BALANCE: F and B adjust the levels of the rear speakers relative to the sides and fronts.
  • Page 10 Controls and Indicators Lexicon Page 6...

  • Page 11: Connection And Calibration

    CP-1 Digital Audio Environment Processor 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 12 Connect the CP-1’s MAIN outputs to your main stereo channels. Connect any additional amplifier/speaker combinations to the remaining outputs on the CP-1: SIDE to the side amplifiers, REAR to the rears, CENTER to the center- channel amplifier and SUB WOOFER to the subwoofer amp.

  • Page 13: Setting The Main Input And Output Levels

    SYSTEM VOLUME -64 dB. Turn on the main stereo power amplifier, then hold the VOLUME UP button until the CP-1’s volume is at -05 dB. If the back-panel potentiometers are turned all the way down, as they should be, you will not hear any sound yet.

  • Page 14: Output Levels

    Page 10 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 to keep in mind when calibrating the system is to keep these potentiometers set as low as possible.

  • Page 15: Calibration Of The Panorama Program

    Find a mono source, such as an announcer on FM radio or a mono film, and listen for a tightly focused center image of speech or singing. If the image is off-center, adjust the CP-1's BALANCE control. (The narrower the monaural image, the better Panorama will work.) Perform the following setup from a relaxed, comfortable position in your listening chair with your head facing the center point between the speakers.
  • Page 16 The Panorama Program is now calibrated. To store it, see page 27. Use PARAM to display the final values of LISTENER POS and SPEAKER ANGLE. Note these values and use them for all forms of Panorama, including the Panorama subsections of AMBIENCE and REVERB. Lexicon...

  • Page 17: Speaker Set-Up And Configuration

    Press the BANK button and hold it for a few seconds. The display will read: LCD CONTRAST ADJ with a bright bar. The CP-1 is now in Configuration mode. Within this mode, operations are carried out using only the three PARAM buttons. Configu- ration mode will be canceled if any other button is pressed or if 10 seconds pass without a button push.
  • Page 18 Consider at least 45-60 watts minimum for your rear channel amplifier. The CP-1’s Configuration routine allows a wide range of choices in speaker and room set-ups to maintain optimal performance as your system ex- pands. If you are starting with a conventional two-channel system, in what order should you add additional channels? The answer depends on whether you are primarily interested in audio or video.
  • Page 19 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 main loudspeakers.
  • Page 20 They also work well on normal speaker stands. Placing the speakers too high in a narrow room may reduce the spaciousness, since this makes the sound come from the ceiling instead of the side walls. Lexicon Center Phantom Button IN Best...
  • Page 21 100Hz 12dB/octave). Instead, we recommend using the main outputs as follows. Connect the CP-1 main (front) and left and right outputs to the inputs of the subwoofer crossover. Then connect the subwoofer output (high pass fil- tered version of the input) to the amplifier driving the main speakers. This has the advantage of bi-amping the main speakers —...
  • Page 22 Speaker Set-Up and Configuration Lexicon Page 18...

  • Page 23: Using The Programs

    Pushing one of the buttons numbered 1 through 12 during normal opera- tion will load that program. Whenever the CP-1 is turned on, it will load the program that was running when it was turned off. Each program has a number of parameters that you can vary with the three PARAMETER keys.
  • Page 24 Panorama works with just two loudspeakers. If side speakers present, Panorama disables them and substitutes its own simulation. The front speakers are driven entirely from the CP-1’s digital circuits. Panorama will also send a stereo difference signal (left channel minus right or vice-versa) to the rear loudspeakers if you have them.

  • Page 25: The Programs: Panorama

    CP-1 Digital Audio Environment Processor EFFECT LEVEL sets the amount of crosstalk cancellation, and thus the 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 26: Ambience

    At very high values the decay is audibly less smooth than in the Reverb programs, which are more effective at simulating very live spaces. Lexicon Range Rectangle, Fan 329 Hz-14.1 kHz...
  • Page 27 CP-1 Digital Audio Environment Processor 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 adjusts the strength of the signal used to expand the stereo image outward from the front two speakers.

  • Page 28: Reverb

    AMBIENCE and REVERB, and has been given its own button on the remote. It should be set as high as possible without making the extra speakers individually audible. Lexicon Range 0.32 - 2.8 sec 0.64 - 5.6 sec 1.28 - 11.2 sec...
  • Page 29 PANORAMA EFFECT adjusts the strength of the signal used to expand the stereo image outward from the front two speakers. Its initial value is zero, unless you have configured the CP-1 for no side loudspeakers. LISTENER POS compensates for the relative distances of the two speakers from the prime listening area.

  • Page 30: 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 31 CP-1 Digital Audio Environment Processor Parameter FRONT EFFECT REAR EFFECT REAR ROLLOFF BASS BLEND AUTO AZIMUTH/BAL REAR DELAY REAR NOISE CHIP CALIBRATE SET PROGRAM NAME MEMORIZE PROGRAM Parameter REAR DELAY AUTO AZIMUTH/BAL BASS BLEND CALIBRATE SET PROGRAM NAME MEMORIZE PROGRAM REAR DELAY in both STEREO LOGIC and PRO LOGIC is adjustable.
  • Page 32 LOGIC becomes the equivalent of a simple non-steered Dolby Surround decoder. If you have no rear speakers, REAR EFFECT should be set to 0. The CP-1 will set this parameter automatically when you specify a speaker configuration with no rear channels. (See page 13.) Dolby Surround decoding specifications call for a special form of Dolby B- type noise reduction.

  • Page 33: To Rename And Store A Register

    Any changes in the parameters of a program in the USER bank will be automatically recorded and stored for future use. The CP-1 also allows you to store a new version of any PRESET or USER program in any USER register.
  • Page 34 Using the Programs Lexicon Page 30...

  • Page 35: Troubleshooting

    Power turn-on with large power amps may cause power sags that will confuse the CP-1. To prevent this, plug the CP-1 into an AC outlet on a different branch circuit, or turn on one amplifier at a time.
  • Page 36 The CP-1 does generate minimal amounts of RF energy and is in compliance with FCC rules. If some interfering noise is noted, move AM loop and FM "T" type antennas away from the CP-1 and reorient them as necessary. Use shielded cable for FM and antenna feeds.
  • Page 37 Possible Cause and Solution Restoring defaults If severe power surges or sags cause problems with CP-1 memory storage, or you simply want to start with a clean slate in the User registers, you can restore factory presets into the User registers with the following procedure.
  • Page 38 Troubleshooting Lexicon Page 34...

  • Page 39: Theory And Design

    CP-1 Digital Audio Environment Processor 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...
  • Page 40 When this is done the room becomes quieter and clearer but not in any way like the original hall. The Lexicon CP-1 resolves this deficiency by supplying appropriate signals to loudspeakers at the sides of the listener or by modifying signals to the...
  • Page 41 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 42 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. In Panorama the front speakers are driven entirely by the front digital outputs of the CP-1.
  • Page 43 Although the CP-1 provides adjustments to compensate for off-center listening and for varying speaker angles, maintaining a consistent listening position is still important and becomes more so with increasing frequency.
  • Page 44 And, unlike previous versions of this technique, the Panorama program adds virtually no coloration to the original signal. Panorama is used in two ways in the CP-1. First, there are the three Panorama programs, designed to reproduce as closely as possible the sound actually recorded by the engineer.
  • Page 45 Panorama is also used as an element in the Ambience and Reverberation programs, where it can synthesize side loudspeakers which are not present in the installation. In this mode the stereo inputs to the CP-1 are fed directly to the front loudspeakers, with the digital outputs of the CP-1 mixed in according to the setting of the Effect Level control.
  • Page 46 . (You can perform this experiment for yourself with the CP-1 using the Ambience program: Try the side speakers both in their usual positions and in the front corners. If your...
  • Page 47 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 48 The remaining music and effects are directed to the input of a room simulation program that creates a space the size of a large room or small theater. The Lexicon...
  • Page 49 The CP-1 is one of a few consumer products to offer full Pro Logic Dolby Surround decoding, and it is the only one that operates entirely in the digital domain.
  • Page 50 Pro Logic decoders sense both the direction of the loudest sound and the difference in level between it and any ambient information. They then use this information to direct the steering. The accuracy with which this is done Lexicon...
  • Page 51 CP-1. The CP-1 Decoder The CP-1 decoder is unusual in a number of ways. First of all, it is entirely digital. (Most surround decoders advertise that they are digital because there is a digital delay line for the surround channel but the matrix and the logic decoding are done in analog.)
  • Page 52 Design Page 48 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 53 When we tried this with the CP-1 we made an interesting discovery. When the Left and Right loudspeakers are spread wide enough to fall within 20 degrees of the listeners' sides, there is a tremendous change in the impact of the film.
  • Page 54 The CP-1 can be used to create a similar set-up in the home by connecting the side speakers to the rear amplifiers. However, our experiments indicate that most people find this far from optimal.
  • Page 55 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).
  • Page 56 Theory Design Lexicon Page 52...

  • Page 57: Specifications

    17"W x 12.5"D x 2.5"H 11 lbs. Rack-mount adapter, Lexicon Part# 021-06639 Specifications subject to change without notice. Specifications 10 Hz - 100 kHz, +1, -3dB* 10 Hz - 16 kHz, +1, -3dB* Patents are pending on the CP-1 Page 53...
  • Page 58 3 Oak Park Bedford, MA 01730 USA Telephone 781-280-0300 FAX 781-280-0490 www.lexicon.com 06/00 | Lexicon Part #070-06619 | Rev 3.0 Printed in the United States of America...

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