Phase Linear 4000
the stereo preamplifier designed to correct the shortcomings in the recording process. Noise inherent in tapes, FM broadcasts, and records is reduced to virtual inaudibility. Dynamic range reduced during recording is selectively restored to closely approximate the original information. This means that for the first time you can hear your music against a silent background. Now your music can extend upwards to life like levels - a kettle drum will have the power of a kettle drum - a cymbal will ring with the intensity of a cymbal.
How else would you describe a preamplifier with:
A peak Unlimiter that restores dynamics lost in recording to closely approximate the original
A Downward Expander that reads "gain riding" and expands dynamics down to precisely the intended level
An Auto-Correlator that makes record/tape hiss and FM broadcast noise virtually vanish without affecting musical content
Plus and Active Equalizer that gives you flat energy distribution over the full audio spectrum. Joystick Balance and Step Tone Controls that allow precise music tailoring to your listening environment and SQ and Phase Linear differential logic for Quad Sound.
The 4000 is an advanced stereo preamp that actually puts back in what recording studios take out, lets your music (at last) reach life-like levels without distortion; lets you (for the first time) hear your music from a silent background. It is , in a word , incredible.
Specifications
Total Distortion: less than 0,25%,. Typically 0,2%
Total Noise:
High Level : 83 dB below 2 V
Phono : 72 dB below a 10 mV reference
Input Impedance
Phono : No less than 47 k Ω (20 Hz - 20 kHz)
High Level : 50 k Ω
Gain:
Phono : 65 dB
High Level : 15 dB
Output Voltage: Full output 8 V RMS. better than 2 V into 47 k Ω or greater
Frequency Response:
Phono : ±1 dB of RIAA from 20 Hz to 20 kHz
High Level : ±1 dB from 30 Hz to 20 kHz
Tone Controls
Bass : Monotonically increasing and decreasing, dual hinge points, +-8 dB at 20 Hz.
Hinge points switch selectable beginning at 40 Hz or 150 Hz.
Treble : Monotonically increasing and decreasing, dual hinge points, ±8 dB at 20 kHz.
Hinge points switch selectable beginning at 2 kHz and 8 kHz.
Active Equalizer: 6 dB /octave boost below 50 Hz
Peak Unlimiter (Nominal peak unlimit rate attack threshold, front panel variable) 0,5 dB/micro second for +6 dB peak unlimit operation
Nominal Amplitude Attack Threshold: 0,2 V peak at input to peak unlimiter
Downward Expander: Donward expansion commences at -35 dB . Ultimate limit is -41 dB. Unlimiter window is 35 dB wide, upper and lower thresholds are simultaneously variable by front panel in limit threshold control.
Four Channel Facilities: Build in CBS SQ system with Phase Linear developed differential logic for enhanced four channel separation.
Semiconductor Complement: 45 Transistors; 9 ICs; 57 Diodes; 2 Zener regulators; 2 LED
Auto Correlator (Noise Reduction Systems):
High Frequency noise reduction commences at 2 kHz and is 3 dB, reaching 10 dB from 4 kHz to 20 kHz.
Low Frequency noise reduction begins at 200 Hz, ultimately reaching 20 dB at 20 Hz.
passive Subsonic filter rejection of -35 dB at 5 Hz.
Weighted overall noise reduction is -10 dB from 20 Hz to 20 kHz.
Tape Monitor: Two tape switches permitting any input source to be recorded on either of two tape machines, play back selection of either machine, or copy of tape machine 2 on to 1 while listening to a second source.
Power Switching Capability: Switched outlets are capable of switching up to 25 ampers
Power Consumption:
Preamplifier : 40 watts
Size (W x H x D): 19" x 7" x 10"
Weight: 18 pounds
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