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:

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

120 V AC, 50 Hz (Canadian 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 42)

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)

Optional accessories

Optical Cable

POC-151HG, POC-152HG, POC-MZ1,

POC-MZ2, POC-15B, POC-15AB, POC-

DA12SP

Line Cable RK-G129, RK-G136

Stereo Microphones ECM-717, ECM-MS907,

ECM-MS957

Stereo Headphones* MDR-D77, MDR-D55

51-GB