SpecificationsSystemAudio playing system

MiniDisc digital audio system

Laser diode properties

Material: GaAlAs

Wavelength: λ = 790 nm

Emission duration: continuous

Laser output: less than 44.6 µW

(This output is the value measured at a distance of 200 mm from the lens surface on the optical pick-up block with 7 mm aperture.)

Recording and playback time

Maximum 80 minutes (MDW-80, stereo recording)

Maximum 160 minutes (MDW-80, monaural recording)

Maximum 74 minutes (MDW-74, stereo recording)

Maximum 148 minutes (MDW-74, monaural recording)

Revolutions

400 rpm to 1,800 rpm (CLV)

Error correction

Advanced Cross Interleave Reed Solomon Code (ACIRC)

Sampling frequency

44.1 kHz

Sampling rate converter

Input: 32 kHz/44.1 kHz/48 kHz

Coding

Adaptive TRansform Acoustic Coding (ATRAC)

Modulation system

EFM (Eight to Fourteen Modulation)

Number of channels

2 stereo channels

1 monaural channel

Frequency response

20 to 20,000 Hz ± 3 dB

Wow and Flutter

Below measurable limit

Inputs

Microphone: stereo mini-jack, 0.35–1.38 mV

Line in: stereo mini-jack, 69–194 mV

Optical (Digital) in: optical (digital) mini-jack

Outputs

i/LINE OUT*: stereo mini-jack Headphones: maximum output level 5 mV + 5 mV, load impedance 16 ohm

LINE OUT: 194 mV, load impedance 10 kilohm

*The i/LINE OUT jack connects either headphones or a line cable.

GeneralPower requirements

Sony AC Power Adaptor (supplied) connected at the DC IN 3 V jack:

230–240 V AC, 50/60 Hz (UK and Hong Kong model)

220–230 V AC, 50/60 Hz (Other European model)

100–240 V AC, 50/60 Hz (Other models) Nickel metal hydride rechargeable battery NH- 14WM (supplied)

LR6 (size AA) alkaline battery (not supplied)

Battery operation time

See “Battery life” (page 40)

Dimensions

MZ-R90

Approx. 78.9 ⋅ 17.3 ⋅ 72.0 mm (w/h/d) (31/8 ⋅ 11/16 ⋅ 27/8 in.)

MZ-R91

Approx. 78.9 ⋅ 18.0 ⋅ 72.0 mm (w/h/d) (31/8 ⋅ 23/32 ⋅ 27/8 in.)

Mass

MZ-R90

Approx. 105 g (3.7 oz) the recorder only Approx. 148 g (5.2 oz) incl. a recordable MD, and NH-14WM nickel metal hydride rechargeable battery

MZ-R91

Approx. 110 g (3.8 oz) the recorder only Approx. 153 g (5.4 oz) incl. a recordable MD, and NH-14WM nickel metal hydride rechargeable battery

Supplied accessories

AC power adaptor (1)

Headphones with a remote control (1) NH-14WM nickel metal hydride rechargeable battery (1)

Dry battery case (1)

Rechargeable battery carrying case (1) Carrying pouch (1)

AC plug adaptor (World model only) (1)

Optional accessories

Optical Cable

POC-151HG, POC-152HG, POC-MZ1, POC-MZ2, POC-15B, POC-15AB, POC- DA12SP

Line Cable RK-G129, RK-G136

49-GB