Phase Linear Model 1000
Autocorrelator Noise Reduction System
You have just purchased the most advanced and most versatile noise reduction and dynamic range recovery system available. Proper use of your Phase Linear 1000 will allow you to reproduce music with less noise and greater dynamic range than previously thought possible. We hope you will read this manual thoroughly in order to appreciate all the benefits of the 1000.
Recording studios and record processing companies employ a number of "necessarily evil” techniques brought about by the state of the recording art. Taken together, these techniques may be described as processes which serve to limit and restrict the dynamic range of recorded material. Unfortunately, their use is necessary in order to put the tremendous dynamic range of live music onto the surface of modern phonograph discs and tapes. When used properly, the Phase Linear 1000 will significantly correct these shortcomings inherent in the recording process.
Before leaving our factory your Phase Linear 1000 was tested and certified to be in perfect operating condition. This manual has been prepared to help you operate your Phase Linear as well as keep it in perfect condition. Your Phase Linear when used with care befitting all fine instruments, is capable of truly providing a lifetime of musical fulfillment.
CONNECTIONS
1.Check front panel to insure:
a.The power switch is in the off position.
b.The 1000’s tape switch is in the source position (out).
2.Connect tape output on your receiver (preamp) to the input on the 1000 and connect the 1000’s outputs to your receiver’s (preamp) tape input jacks.
3.Plug in the 1000’s AC cord while leaving the unit turned off.
4.Turn on your receiver (preamp), and then turn on the 1000.
5.The tape monitor on your receiver or preamp should be in the monitor position.
6.Refer to the Operating Instructions for correct operation and adjustment of the Correlator and Peak Unlimiter circuits.
AUXILIARY EQUIPMENT
Outboard units such as Dolby or DBX may be used with your 1000 but the 1000 must be placed “after” the units in the signal path and “before” any equalizer in signal path, or as shown.
Any source played through the 1000 will be processed. It is not necessary, therefore, to process a signal prior to recording since it will be processed on playback. However, if you wish to make a tape to be played back on another system, simply install the 1000 between source and the tape recorder.
Note: It is not advisable to use the Expander during recording since it will stress the recorder’s dynamic range capability.
FRONT PANEL CONTROLS
Unlimit Threshold Lamp: Provides visual indication of peak unlimit operation. This lamp should come on during the peaks in the program material but should not stay on all the time.
Unlimit Threshold: Rotate clockwise to increase dynamic range of program material. Adjust so that unlimit indicator lamp illuminates on peaks and extinguishes between musical peaks. This knob adjusts both the peak unlimiter and the downward expander.
Low Frequency Calibration: Adjusts low frequency noise reduction. Once this is adjusted properly it should not be changed unless your cartridge or turntable is changed. An incorrect setting of this control will cause a loss of bass response. (See Operating Instructions)
Correlation Threshold: Rotate counterclockwise to remove noise from program material. Correct adjustment is indicated by absence of random hiss and presence of all high frequencies associated with the musical program. Incorrect adjustment is indicated by complete loss of high frequencies or by presence of noise in the program. Typically, proper settings are found in the eleven to three o’clock positions though this setting will vary with the source material.
Power Indicator: Illuminates when unit is on.
Power: Press in to turn unit on.
Autocorrelator: Press in to activate correlator.
Peak Unlimiter: Push in to activate Peak Unlimiter/Downward Expander.
Tape Source: Press in to use tape path on Model 1000.
OPERATING INSTRUCTIONS
AUTOCORRELATOR
The AUTOCORRELATOR is a noise reduction system designed to remove noise from any signal source. The following steps should be used to adjust the AUTOCORRELATOR:
Step 1: Rotate the CORRELATION THRESHOLD control fully clockwise.
Step 2: Check to insure that the Correlator is turned on.
Step 3: Put on a good quality record, advance the treble controls to full maximum on your preamplifier or receiver. Select a portion of the record in which hiss may readily be heard against the musical program. Slowly rotate the Correlation Threshold counterclockwise. As the control is progressively rotated counterclockwise, a point will be reached at which the record hiss drops to a very reduced level while the high frequencies of the musical program remain unaffected. Further counterclockwise rotation will have no effect on the program until a rather extreme counterclockwise rotation results in an abrupt and complete loss of high frequencies associated with the music. The Correlator is said to be "in lock” when the threshold control is set anywhere within the two limits outlined above. The correct setting is midway between these
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