Related Manuals for Bang & Olufsen Beogram 4000c
Summary of Contents for Bang & Olufsen Beogram 4000c
- Page 1 Beogram 4000c Technical Sound Guide Bang & Olufsen A/S This manual is for information purposes only and is not legally binding. November 27, 2020...
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Page 2: Table Of Contents
..........16 5 Beogram 4000c Specifications... -
Page 3: History
History 1.1 The mechanical the groove became smoothed. bi-directional. When current is sent phonograph through a wire, a magnetic field is It was ten years later, in 1887, that the generated around it. However, it is also German-American inventor Emil true that moving a wire through a In 1856, Édouard-Léon Scott de Berliner was awarded a patent for a... -
Page 4: The Physics
The physics curves when they pass Time = 0 ms, you’ll see that the higher the frequency, the higher the slope of the 2.1 Amplitude vs. Velocity line, and therefore the higher the velocity of the stylus. It is this second interaction that is at -0.2 the heart of almost every modern -0.4... -
Page 5: Mono To Stereo
higher frequencies. Upon playback, the slipping out of the groove when it is level of the treble is reduced; the too shallow, or suffering from higher the frequency the lower the excessive wear if the groove is too output. This reduces the problem of deep. - Page 6 However, both of these systems were only capable of recording a single channel of audio information. In order to capture 2-channel stereo audio (invented by Alan Blumlein in 1931) the system had to be adapted somehow. The initial challenge was to Figure 2.11: Example of two different find a way of making a disc player that signals encoded on the two channels of...
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Page 7: The Cartridge, Stylus, And Tonearm
The cartridge, stylus, and tonearm 3.1 MMC: Micro Moving Cross As mentioned above, when a wire is moved through a magnetic field, a current is generated in a wire that is proportional to the velocity of the movement. In order to increase the output, the wire can be wrapped into a coil, effectively lengthening the piece of wire moving through the field. -
Page 8: Signal Levels
push-pull wiring of the coils effects, should be loud enough to mask The “flat line” on the left of the plot is “reduces harmonic distortion the noise that is inherent in the the result of the noise floor of the induced by the non-linearity of recording or transmission itself. - Page 9 The question of Beogram 4000c clipping the Line input music because the grooves are how much distortion is “too much” can stage of a device connected intentionally spaced further apart, as is then be debated –...
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Page 10: Tip Shape
vinyl and the tip of the stylus. In When a record is mastered (meaning, general terms, as we’re already seen, when the master disc is created on a Flat face there is a groove with two walls that lathe) the groove is cut by a heated vary in height, almost independently stylus that has a specific shape, shown and the tip of the stylus traces that... - Page 11 simply too big to accurately track the conical stylus in Figure 3.13. 20 kHz tone. 12" 33 1/3 RPM 7" 45 RPM -100 Distance from centre of disc to stylus (mm) Groove length (µm) -100 Figure 3.11: The relative speed of the Groove length (µm) stylus to the surface of the vinyl as it tracks from the outside to the inside ra-...
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Page 12: Bonded Vs. Nude
Figure 3.16: An example of an elliptical 1.3 g for the Beogram 4000c in order stylus on the left vs. a line contact Pra- mass dramatically, so it is preferred if manik grind on the right. -
Page 13: Compliance
1 kg mass, If a turntable is very poorly adjusted, since you are trying to overcome the Today, the Beogram 4000c is supplied then a high tracking force and a high inertia of all 1500 kg, not the 1 kg that with an SMMC20CL cartridge made by stylus compliance (therefore, a “soft”... -
Page 14: Audio Specifications
However, that output signal is specification (such as a single number In the case of the Beogram 4000c, the first filtered to ensure that the level for “Wow and Flutter”, for example) frequency response is measured from detection is not influenced by... -
Page 15: Measurement And Weighting
• How much does the speed over time very slowly. Any variation tone varies over time, and it is this change? that happens slower than once every 2 variation that is measured and seconds (in other words, with a analysed. •... -
Page 16: Expressing The Result
comparing one Wow and Flutter looking at the peak deviation to give a be less than 1% for 95% of the time measurement value should be kind of “worst-case” scenario. In this you are listening to music. The interpreted very cautiously... method, the 3150 Hz tone is played principal reason this method was not from a disc and captured for as long a... -
Page 17: Beogram 4000C Specifications
Beogram 4000c Specifications Turntable Maximum Typical Output Level, 35.4 mm/sec, 1 channel, 1 kHz* 354 mV RMS Maximum Output > 8.0 V Peak Deviation from RIAA standard, 20 - 20,000 Hz < ± 1.0 dB ± 0.6 dB Channel difference, 20 - 20,000 Hz <... -
Page 18: Further Reading
Further Reading Audible Effects of Mechanical Resonances in Turntables; Brüel and Kjær Application Note (1977) Audio Measurement Handbook; Bob Metzler, Audio Precision Inc. (1993) Basic Disc Mastering; Larry Boden (1981) Handbook for Sound Engineers: The New Audio Cyclopedia; ed. Glen Ballou (1987) How the Stereo Disc Works;... - Page 19 IEC Publications • 98: Recommendations for Lateral-Cut Commercial and Transcription Disk Recordings • 98: Processed Disk Records and Reproducing Equipment • 386: Method of Measurement of Speed Fluctuations in Sound Recording and Reproducing Equipment...