3Com CP-1 - Manuals

Page 1 CP-1 Digital Audio Environment Processor Introduction Controls and Indicators 1 All of the programs in the Lexicon CP-1 Digital Audio EnvironmentProcessor have a common goal: to draw you, the listener, more deeply intoa musical performance or a film. For music the CP-1 uses unique digitalproc...

Page 2 Lexicon The Front Panel Source The SOURCE buttons select one of two identical stereo pairs of audioinputs. Ordinarily Input I will be connected to the main outputs of yourstereo preamp and the second input will be a spare. In video installations,Input I will be connected to the main audio out...

Page 3 CP-1 Digital Audio Environment Processor The Rear Panel Rear and SideOutputs Stereo outputs for rear and side power amplifiers, with level adjustingknobs. The procedure for balancing these outputs (as well as the centerchannel and subwoofer) with the main pair begins on page 9. Main outputs, ...

Page 4 Lexicon The Remote Control The Programs The REVERB programs, like AMBIENCE, simulate rooms of three sizeswith the aid of side and rear channels. These programs have fewer specificinitial reflections than AMBIENCE but richer and smoother reverberantdecay. REVERB is especially good for simulati...

Page 5 CP-1 Digital Audio Environment Processor Surround Controls and Indicators * The first push of either of this pair of buttons displays the current value for five seconds; another push during that time increases or decreases the displayed value. Holding the button down for 1 second engages auto...

Page 7 CP-1 Digital Audio Environment Processor 2 Connection and Calibration Installation • Make sure the remote control receiver, located on the right side of the front panel, is unobstructed. The remote control must be in line of sightto this receiver for proper operation. The CP-1 may be placed i...

Page 8 Lexicon ConnectionandCalibration VCR or CASSETTE DECK AUDIO OUT I II TAPE OUT/IN REAR MAIN SIDE SIDE AMPS CP-1 INPUTS VCR, TV, VIDEO CONTROL CENTER REAR AMPS CENTER AMP SUBWOOFER AMP CENTER SUB WOOFER INTEGRATED AMP, PREAMP or RECEIVER TAPE IN TAPE OUT Connecting the CP-1 in a Tape Monitor Lo...

Page 9 CP-1 Digital Audio Environment Processor Connection and Calibration Push the INPUT I button on the front panel. Push the MONITOR SOURCEand TAPE PRE buttons. Turn the INPUT LEVEL knob all the way down(counterclockwise). The CP-1 has its own volume and balance controls, which you will be usingi...

Page 10 Lexicon ConnectionandCalibration 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 allthe channels in your system relative to each other. The most important thingto keep in mind when calibrating the...

Page 11 CP-1 Digital Audio Environment Processor Connection and Calibration PANORAMA works by canceling the sound going from each speaker to theopposite ear. The effectiveness of the program is highly dependent on thegeometry of your front loudspeakers, the room and your listening position.The corre...

Page 13 CP-1 Digital Audio Environment Processor Speaker Set-Up and Configuration Configuration Speaker Configurations 3 Press the PARAM UP or DOWN buttons until the contrast of the display isat a maximum as seen from your listening chair. Then push PARAM toenter the Configuration menu. Consulting t...

Lexicon Page 14 SpeakerSet-Up andConfiguration Notes on Amplifiers 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 youplay the system? Generally, the demands on the side and rear channels arehigher for film sound th...

Lexicon Page 16 1 Center Phantom Button IN Good 9 Center Phantom Button IN Best Better Center Phantom Button IN 5 If your main interest is music, you will most likely begin with two high-quality main speakers (Configuration 1). Here the Panorama programalone will add substantial enhancement in spati...

Page 17 CP-1 Digital Audio Environment Processor Subwoofer Connections The Subwoofer Output is a monaural signal created by summing the left,right and center outputs, then filtering out frequencies above 100 Hz at arate of 12 dB per octave. Connecting a subwoofer to the CP-1 rear-panel Subwoofer Out...

Page 19 CP-1 Digital Audio Environment Processor To Load, Modify andStore Programs 4 Using the Programs The CP-1 contains four basic programs: Panorama, Ambience, Reverb andSurround. Each program has three variations which occupy one row on theremote control. Pushing one of the buttons numbered 1 th...

Page 20 Lexicon Panorama The Programs:Panorama The location of the front speakers and the listening position are crucial toPanorama’s effectiveness and for best results your system and the CP-1together should be set up and calibrated according to the procedure on page10. The strength of the Panorama...

Page 22 Lexicon Ambience The Programs:Ambience Ambience generates the appropriate early reflections for stereo simulationof one of six different halls — one rectangular hall and one fan-shaped hallin small, medium and large sizes — and sends the reflections to the side andrear speakers. For systems ...

Page 23 CP-1 Digital Audio Environment Processor The Programs: Ambience ROLLOFF mimics the absorption of the air in the hall and its initial value istherefore more pronounced (the rolloff begins at a lower frequency) thelarger the space. Rolloff PANORAMA EFFECT adjusts the strength of the signal use...

Page 24 Lexicon Reverb The Programs:Reverb The Reverberation program differs from Ambience in that it does notsimulate the early reflections of specific halls, but emphasizes rich, smoothreverberant decay in small, medium or large spaces. It works well forsimulating a space with a long reverberation...

Page 26 Lexicon Surround The Programs:Surround Treble Mono Logic Program Parameters Effect Level The term Dolby Stereo refers to both movies and equipment used exclusively for theatricalpresentation. When one of these movies is transferred to commercial video media, the specialaudio encoding of the ...

Page 27 CP-1 Digital Audio Environment Processor The Programs: Surround REAR ROLLOFF controls the treble attenuation and should be adjusted onmusic for maximum airiness and spatial realism without causing specificinstruments to seem to come from behind you. Stereo Logic’s REARROLLOFF parameter conta...

Page 29 CP-1 Digital Audio Environment Processor To Rename andStore a Register Storing a Register Naming a Register Using the Programs Restoring OriginalSettings 2. Push program # to select a position 1.Push Param to SET PROGRAM NAME 3.Push UP/DOWN to select a character See also TEST MODE, page 17. ...

Page 31 CP-1 Digital Audio Environment Processor 5 Troubleshooting Troubleshooting If you encounter a problem, please review the items in the followingchecklist. Also be sure to thoroughly check all other connected componentssuch as speakers, receiver/amplifier/preamp, VCR, TV, CD player, etc. Probl...

Lexicon Page 32 Troubleshooting 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. Re...

Page 33 CP-1 Digital Audio Environment Processor Troubleshooting Problem Possible Cause and Solution Restoring defaults If severe power surges or sags cause problems with CP-1 memorystorage, or you simply want to start with a clean slate in the Userregisters, you can restore factory presets into the...

Page 35 CP-1 Digital Audio Environment Processor Lateral Sound For decades the study of concert-hall acoustics relied on certain basicmeasurements to characterize halls, the main one being the time it takes asound to drop in level (decay) by 60 decibels. This is called the reverberationtime or RT 60...

Lexicon Page 36 } Side sound must be within this angle. TheoryandDesign Understanding the importance of lateral reflections enabled more accurateevaluation of architectural acoustics. The best halls were usually found tohave high lateral energy for obvious architectural reasons, such as a longnarrow...

Page 37 CP-1 Digital Audio Environment Processor Theory and Design sides. Both methods depend on having the added sound come from adifferent direction than the original music, and each method has someadvantages. With either method of generating SI there is an additionalchoice the CP-1 allows the use...

Lexicon Page 38 the left speaker. The main problem with a first-order device is that the subtracting signal isalso heard by the opposite ear. In our example, the canceling signal from theright loudspeaker will diffract around the head to the left ear, interferingwith the left-speaker sound and produ...

Lexicon Page 44 The Surround Programs TheoryandDesign enhanced film viewing. Mono Logic is a stereo conversion program for monaural film sound tracks.A quick look through any video rental selection will prove the usefulness ofsuch a program; the vast majority of titles are mono. The problem of mono-...

Lexicon Page 46 Simple logic decoders turn down theleft and right speakers during dialog.This seriously affects music and ef-fects. speakers, effects are smeared and often unconvincing . Pro Logic Decoding A Pro Logic decoder, like the professional Dolby Stereo cinema processor,both enhances the dia...

Page 49 CP-1 Digital Audio Environment Processor Theory and Design sounds appear in the front left and right speakers (and the side left and rightspeakers, 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 Rea...

Page 51 CP-1 Digital Audio Environment Processor 1. Schroeder, M.R., Gottlob, D. and Siebrasse, K.F.,"Comparative Study ofEuropean Concert Halls: Correlation of Subjective Preference with Geo-metric and Acoustic Parameters", J. Acoust. Soc. Am., vol. 56, pp. 1195-1204(1974). 2. Barron, M., a...

Page 53 CP-1 Digital Audio Environment Processor 7 Specifications Patents are pending on the CP-1 Unprocessed channels: 10 Hz - 100 kHz, +1, -3dB* Processed channels: 10 Hz - 16 kHz, +1, -3dB* *Ref. 1 kHz Frequency Response: Front: Less than .05%, 1 kHz, max level Sides: Less than .05%, 1 kHz, max l...