Specifications

Supported file formats


Music
Audio Formats (Codec)
MP3
Media File format: MP3 (MPEG-1 Layer3) file format
File extension: .mp3
Bit rate: 32 to 320 kbps (Supports variable bit rates (VBR))
Sampling frequency (*1): 32, 44.1, 48 kHz
WMA
Media File format: ASF file format
File extension: .wma
Bit rate: 32 to 192 kbps (Supports variable bit rates (VBR))
Sampling frequency (*1): 44.1 kHz

(*1) Sampling frequency may not correspond to all encoders.

Maximum recordable number of songs and time (Approx.)

The approximate times are based on the case in which you transfer only 4-minute songs in the MP3 format. Other playable audio file format song numbers and times may differ from MP3 format.


NWZ-B172/B172F
NWZ-B173/B173F
Bit rate
Number
Time
Number
Time
48 kbps
1,250
83 hr. 20 min.
2,550
170 hr. 00 min.
64 kbps
880
58 hr. 40 min.
1,950
130 hr. 00 min.
128 kbps
440
29 hr. 20 min.
970
64 hr. 40 min.
256 kbps
220
14 hr. 40 min.
490
32 hr. 40 min.
320 kbps
170
11 hr. 20 min.
390
26 hr. 00 min.

Maximum recordable time (Approx.)

The times below are estimated for the case where only FM (NWZ-B172F/B173F only) or voice audio files are stored. The time may differ, depending on the conditions under which your Walkman is used.


NWZ-B172/B172F
NWZ-B173/B173F
Codec (*1)
Time
Time
[Voice Record Codec]:[High]
21 hr. 30 min
47 hr. 40 min.
[Voice Record Codec]:[Mid]
43 hr. 10 min
95 hr. 20 min.
[Voice Record Codec]:[Low]
86 hr. 30 min
190 hr. 40 min.
FM recording
10 hr. 40 min
23 hr. 50 min.

(*1) Your Walkman uses MS-ADPCM codec for recording the sound and the FM programs.

Maximum recordable number of files or folders (Approx.)

  • Files: 2,640

  • Folders: 500

Capacity (User available capacity) (*1)

NWZ-B172/B172F: 2 GB (Approx. 1.61 GB = 1,717,579,944 bytes)
NWZ-B173/B173F: 4 GB (Approx. 3.53 GB = 3,784,388,776 bytes)
(*1) Available storage capacity of your Walkman may vary.
A portion of the memory is used for data management functions.

Output (headphones)

Frequency response
20 to 20,000 Hz (when playing data file, single signal measurement)

FM radio (NWZ-B172F/B173F only)

  • Preset: 30 presets

  • FM Frequency range: 87.5 to 108.0 MHz (The frequency is changed by 0.1 MHz.)

IF (FM)

Unsupported

Antenna

Headphone cord antenna

Interface

Headphone: Stereo mini-jack
Hi-Speed USB (USB 2.0 compliant)

Operating temperature

5 °C to 35 °C (41 ºF to 95 ºF)

´╗┐Power source

  • Built-in 170 mAh rechargeable lithium-ion battery

  • USB power (from a computer via a USB connector of your Walkman)

Charging time

USB-based charging
Approx. 70 minutes

Battery life (continuous playback)

Actual battery life may vary depending on settings. The estimated battery usage hours shown below are based on typical usage conditions with “Basic setting of battery life measurement” as shown in the table below.
Note
  • Even if your Walkman is turned off for an extended period, a small amount of battery power is still consumed.

  • Battery life may vary depending on volume setting, conditions of use, and ambient temperature.



Music
Playback at MP3 128 kbps
Approx. 18 hours
Playback at WMA 128 kbps
Approx. 17 hours
FM radio (NWZ-B172F/B173F only)
Receiving FM broadcasting
Approx. 6 hours
Recording
Approx. 3 hours
Voice recording
Recording
Approx. 6 hours

Your Walkman settings which affect battery life



Setting
Default settings
Basic setting of battery life measurement
Bass function
[BASS] (*1) [Details]
Activate
Deactivate
[Music Settings]
[Equalizer] (*2) [Details]
[None]
[None]
[Rec Settings]
[Voice Record Codec] [Details]
[Mid]
[Low]
[Common Settings]
[Power Save Mode] (*3) [Details]
[Save ON Normal]
[Save ON Super]
[LED] (*1) [Details]
[LED ON]
[LED OFF]

(*1) Setting to activate [BASS] and [LED ON] shortens the battery life by about 50%.
(*2) Setting [Equalizer] to other than [None] shortens the battery life by about 50% compared with the [None] setting.
(*3) The [Save ON Normal] setting shortens the battery life by about 30% compared with the [Save ON Super] setting.
The [Save OFF] setting shortens the battery life by about 70% compared with the [Save ON Super] setting.

Display

3-line LCD

Dimensions (w/h/d, projecting parts not included)

88.8 × 22.5 × 15.0 mm (3 1/2 × 29/32 × 19/32 inches)

Dimensions (w/h/d)

89.2 × 24.0 × 15.0 mm (3 5/8 × 31/32 × 19/32 inches)

Mass

Approx. 28 g (Approx. 1.0 oz)

Design and specifications are subject to change without notice.