ARCAM DELTA Black Box3
¥ 150,000 (around 1990)
Commentary
D/A converter using 1-bit method.
Uses Arkham custom IC.
The D/A converter uses several ICs in the digital processing part, so the rise time of the digital signal is faster, and it acts like an antenna between the circuit trace and the IC, causing high frequency noise.
Arkham's custom-designed ICs take the place of these ICs and the wires connected to all ICs, eliminating the biggest source of noise.
The D/A conversion section uses a 1-bit D/A converter using two Philips SAA7321 s.
A custom IC developed by Arkham Co., Ltd. traces the required signal process in separate mode to reduce distortion and improve linearity at low levels.
The analog filter uses an operational amplifier IC for measuring instruments and is designed with a high-speed DC coupling.
The power supply is equipped with independent transformers for analog and digital circuits and uses seven independent regulators.
The star ground system minimizes power supply ground noise.
It was designed to upgrade hardware.
The printed circuit board of the D/A converter is designed to be interchangeable so that the board can be easily replaced in the future when converter technology advances.
There was a wood case as an option sold separately.
Model Rating
| Type | D/A converter |
| Digital input | Optical, Coaxial * Switch with front panel switch |
| Sampling frequency | 44.1 kHz, 48 kHz |
| Digital system | 1 bit x256 times |
| Number of D/A converters | 4 |
| Frequency characteristic | 10 Hz ~ 20 kHz + 0 -0.5 dB |
| Total harmonic distortion factor | 0.005% (at 0 dB output) |
| Signal-to-noise ratio | 104dB(CCIR) |
| Dynamic range | 96 dB or more |
| Analog output | Main : 2.4V/22 Ω Aux : 1.0V/22 Ω |
| Pwer | 100 VAC, 50Hz/60Hz |
| External dimensions | Width 430x Height 64x Depth 275 mm |
| Weight | 3.5kg |
| Sold Separately | Wooden case (¥ 32,000) |