SONY FLX-1
¥ 39,800 (around 1991)
Commentary
A CD system that combines a table-top style CD player and an octagonal style speaker with a built-in amplifier.
It was named the Flexy system.
Player part
The D/A converter uses a high density linear converter system and is equipped with a pulse 4D/A converter.
The Pulse D/A converter consists of a current source and an electronic switch. It expresses music waveform by switching two values of 0 and 1 at high speed. By this, the amplitude level is always constant and changes only in the time axis direction. The PLM (Pulse Length Modulation) wave is output. By passing it through a low-pass filter, unwanted high-frequency noise outside the audio band is removed and music waveform is obtained.
To reduce quantization noise in the audible band up to 20 kHz, the pulse D/A converter is equipped with a multi-stage noise shaping operation that employs 64 times oversampling and the Sony Extended Noise Shaping method. Oversampling reduces quantization noise in the audible band by increasing the sampling frequency. Noise shaping reduces quantization noise in the audible band by feeding back the requantization error to the input side when the number of bits is reduced. These technologies ensure a high dynamic range.
The pulse D/A converter operates at 45 mega pulses per second, and it completely eliminates differential non-linear distortion, glitch, and 0 cross distortion, which were difficult with conventional methods.
The FLX-1 uses a single-mode pulse D/A converter. A single pulse D/A converter provides a 4D/A output that outputs positive and negative LR signals.
In order to take advantage of the pulse D/A converter, the high-density linear converter system is equipped with a 45-bit noise-shaping digital filter in the front stage. This circuit performs high-precision oversampling and first order noise-shaping operation on the result to ensure a high dynamic range.
A direct digital sink is included to eliminate jittering issues.
In this system, the master clock is formed on the same chip as the pulse D/A converter, and jitter is eliminated in principle by eliminating jitter immediately before the electronic switch, which is the final stage of the pulse D/A converter.
The player has an external input terminal that can be connected to a Walkman or radio.
Rotary volume is used for the volume part.
Built-in Program Edit, Delete Play and Delete Shuffle functions.
Equipped with clock display function of AM/PM12 hour display.
Equipped with a timer function that sounds a disk performance or buzzer when the time comes. Two timers can be set.
It also has a sleep function that automatically lowers the volume and turns the power off when the set time (30 minutes, 60 minutes, until the end of disc) comes.
It is equipped with an alarm function, and when the set time (up to 99 minutes in 1 minute unit) comes, the time can be notified by a disc or buzzer.
Equipped with a dimmer function, the display brightness can be reduced when the power is turned off or between 12 : 00 PM and 5 : 59 AM.
The relay A-B repeat function can be operated from the remote control.
A-B Repeat If you press the A-B Repeat button again during a performance, the original point B becomes the new point A.
Speaker part
By adopting an octagonal design for the speaker section, both vertical and horizontal placement are possible.
Other
There are 2 color variations, black and white.
Wireless remote control is included.
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Model Rating
| Type | Personal CD system |
| <Player Part> | |
| Reading system | Non-contact optical reading (using semiconductor laser) |
| Laser | GaAlAs double hetero diode |
| Number of revolutions | 200 ~ 500 rpm |
| Error correction method | Sony Super Strategy Cross Interleaved Read-Solomon Code |
| Number of channels | 2 Channel |
| Frequency characteristic | 2 Hz to 20 kHz ± 0.5 dB |
| Total harmonic distortion factor | 0.008% or less (EIAJ) |
| Signal-to-noise ratio | 100 dB or more (EIAJ) |
| Wow and flutter | Below the limit of measurement (± 0.001% Wpeak) (EIAJ) |
| Output level | 0 V ~ 2 Vrms (Variable) |
| Headphone output level | 10 mW (32 Ω) |
| Power consumption | 8W |
| External dimensions | Width 141x Height 60x Depth 220 mm |
| Weight | 1.1kg |
| Speaker Unit | |
| Method | 1-Way, 1-Speaker, Bass Reflex System, Magnetic Protection Design (EIAJ) |
| Units Used | For all bands : 8 cm cone type |
| Maximum power output | 4W+4W |
| Power consumption | 12W |
| External dimensions | Width 120x Height 232x Depth 120 mm |
| Weight | Approx. 2.6 kg (2 Pieces 1 Set) |
| <Others> | |
| Attachment | Wireless Remote Control RM-DD1 |