Aiwa released the HD-S1 portable DAT recorder in 1990.
The two recorders are identical apart from minor cosmetic changes and the introduction of SCMS compliancy in the HD-S1
The SCMS copy management system (whereby one digital copy may be made which is encoded with an inhibit signal to prevent further digital copying).
The HD-X1 and HD-S1 comprise two modules: the transport and playback circuitry, and a separate plug-in "recording block" carrying an A/D converter.
The unique feature of this unit at this price is that it has a digital audio interface as well as the usual analogue inputs and outputs.
The digital I/O connection actually uses a non-standard mini-jack connector, but a lead was supplied with standard phono connectors on the other end to connect directly to your CD player or to another DAT player
The analogue input/output unit (HD-A1) is in a separate housing which you must attach to the top of the main unit when you wish to use it. This has stereo mini-jack sockets for input and output, and also features record level and balance controls, a Line/Mic switch, and a 20dB Mic attenuator switch.
The HD-A1 also needs a battery, unless the main unit is being powered from an external source.
The units weigh 610g (including battery) and 100g respectively.
The HD-S1 uses the latest one-bit technology, the A/D block being based on Technics's MASH circuit and the D/A on Philips's Bitstream.
Standard DAT subcode read/write protocols are used, with automatic track numbering during recording and all recording start points indexed.
Direct track access is at 120-times normal speed.
| Tape | Digital audio tape |
| Head | Rotating head |
| Tape speed | 8.15 mm/sec |
| Sampling frequencies (record) | 48 kHz, 44.1 kHz, 32 kHz |
| Sampling frequencies (playback) | 48 kHz, 44.1 kHz, 32 kHz |
| Digitization | 16-bit linear |
| Number of channels | 2 (stereo) |
| Frequency response | 20Hz~22,000 Hz |
| S/N ratio | 85 dB or better |
| Dynamic range | 85 dB or better |
| Total harmonic distortion | 0.01% or less (1 kHz) |
| Wow & flutter | Measurable limit (±0.001% W PEAK) or less |
| Headphone connector | Stereo mini jack (max. 15mW + 15mW, EIAJ/32Ω) |
| Digital I/O connector | Stereo mini jack (0.5 Vp-p, input/output impedance 75Ω) |
| Analog input connector (A/D converter) | Stereo mini jack |
| Analog input level (line) | 200 mV, input impedance 47 kΩ |
| Analog input level (mic) | 1 mV (ATT 0 dB) / 10 mV (ATT 20 dB), input impedance 10 kΩ |
| Analog output connector | Stereo mini jack |
| Analog output maximum level | 1.2V RMS (48 kHz), output impedance 47 kΩ |
| Power supply | Rechargeable lead battery DC 6V (PB-20) / Local AC power via AC adaptor DC 7.4V |
| Battery life (playback) | Approx. 55 minutes (EIAJ, 2 hours recharging) |
| Battery life (digital recording) | Approx. 55 minutes (EIAJ, 2 hours recharging) |
| DAT dimensions | 95.0(W) × 38.1(H) × 146.4(D) mm |
| A/D converter dimensions | 94(W) × 37.6(H) × 50.1(D) mm |
| DAT weight | Approx. 610g (with rechargeable lead battery) |
| A/D converter weight | Approx. 100g (without rechargeable lead battery) |
| AC adaptor rated voltage | AC-740E: AC 220V / AC-740K: AC 240V |
| AC adaptor rated input | 18 VA, 50/60 Hz |
| AC adaptor rated output | DC 7.4V, 1000 mA |
| Usable batteries | AIWA rechargeable lead battery PB-20 |
| Accessories | A/D converter HDA-1 (1), Rechargeable lead battery PB-20 (1), AC adaptor AC-740 (1), Connecting cord (2), Wired remote controller (1), Carrying case (1) |
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