DENON DA-S1
¥ 780,000 (around 1993)
Commentary
D/A converter with ALPHA processors.
The ALPHA processor (Adaptive Line Pattern Harmonized Algorithm) is used in the D/A converter, and digital data is stored based on digital data so that it approaches the analog waveform existing in nature.
It also functions as the world's first adaptive digital filter (Automatic Low Pass filter Harmonic Adjustment) that automatically adjusts the cutoff band based on the input signal even when a CD with a different recording method is applied.
Equipped with five types of digital interface, it supports ST-Link, Tos-Link, balanced line (AES/EBU balanced transmission) XLR, unbalanced line (two wire coaxial unbalanced transmission) RCA and BNC.
When used with the DP-S1, synchronous drive by ST Gen-Lock is also possible. The master clock of the D/A converter operates the IC of the CD transport side at the same timing, eliminating clock jitter caused by digital transmission.
The clock oscillation circuit is equipped with two modes simultaneously, Level I and Level II, and strictly complies with the sampling frequency of commercial and consumer equipment specified by EIAJ standard.
An FET-input discrete non-feedback class A DC amplifier is mounted on the analog output stage to obtain low impedance and wide dynamic range.
In addition, the DC component is cut by the DC servo to protect the amplifier and speaker from damage.
The output stage of the D/A converter is balanced by generating an inverted signal from the output of the digital filter by digital calculation, which increases the accuracy and enables more accurate signal transmission.
Equipped with Λ S. L. C., eliminating 0 cross distortion.
Digital and analog circuits and left and right channels are separated in the layout.
Uses a copper plated shield structure.
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Model Rating
| Type | D/A converter |
| Number of channels | 2 Channel |
| Frequency characteristic | 2 Hz to 20 kHz ± 0.2 dB |
| Signal-to-noise ratio | 120dB |
| Dynamic range | 100dB |
| Total harmonic distortion factor | 0.0015% |
| Channel separation | 120dB |
| Wow and flutter | Measurement limit (± 0.001% W. peak) or less |
| Output voltage | Unbalance : 2.5 Vrms (10k Ω load) Balance : 2.5 Vrms (at 10k Ω load) |
| Pwer | 100 VAC, 50Hz/60Hz |
| Power consumption | 27W |
| External dimensions | Width 434x Height 141x Depth 419 mm |
| Weight | 20.0kg |