Sony ICD-SX733 Digital Flash Voice Recorder

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Product Highlights

  • Built-In 4GB Flash Memory
  • microSD Expansion Slot
  • Up to 159 Hours Record Time
  • Record as WAV or MP3 Files
  • Automatic / Manual Recording Levels
  • 5-Second Pre-Record Buffer
  • Key Control & Voice-Up Features
  • Dual A/D Convertors
  • Built-In Rechargeable Battery
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The Sony ICD-SX733 Digital Flash Voice Recorder features 4GB of internal flash memory and can capture audio as PCM WAV or MP3 files. It is capable of recording up to 159 hours of audio at 48kbps MP3 quality. The SX733 has selectable automatic or manual record levels, allowing you to let the device adjust recording levels itself or control the levels yourself. The unit is powered by its built-in rechargeable battery. Sony includes a USB cable, a pair of stereo headphones, a carrying case, and a stand.

3-Element Microphone
The 3-element microphone array featuring adjustable sensitivity and zoom functionality.
Dual AD Convertors
The dual analog to digital converters work in tandem to deliver wider dynamic range with minimized distortion. The result is recordings that capture everything from the quietest whisper to the loudest noise in the room and all things in between
Memory Card Expansion Slot
A built-in Memory Card Expansion Slot (microSD/M2) allows for additional recording time via removable flash memory. It can also be used to transfer recordings to a computer. Thanks to the cross-memory recording feature, the recorder can automatically extend a recording from the built-in flash memory to the micro SD card without interruption
Pre-Record Mode
Pre-Record mode, when activated, buffers sound for five seconds prior to the moment when the Record key is depressed so you never miss a word or note
Playback Convenience-Key Control
With Key Control, playback speed can be adjusted from 0.25 times to 3.00 times in natural tones by means of a digital processing function. You can even adjust playback in semitones higher or lower, each in 6 steps
Playback Convenience-Voice Up
When activated, the Voice Up function amplifies low volume sounds so that distant voices and other sounds can be heard
Type Digital
Mode Mono
Recording Format LPCM
Bit-Depth 16
Bit-Rate 48 Kbps - 320 Kbps
Sample Rate 16kHz - 48 kHz
Recording Time PCM Mono: 5.3 Hours Recording in LPCM Format
HQ Mono: 39.75 Hours Recording in MP3 Format
SP Mono: 159 Hours Recording in MP3 Format
Microphone Type Internal Stereo - 3 Elements
Microphone Sensitivity Manual SENS Setting
Auto SENS Setting
Frequency Response 40 Hz - 20 kHz @ 44.1 kHz Sample Rate / 16 Bit LPCM
40 Hz - 20 kHz @ 44.1 kHz Sample Rate / 320 kbps MP3
40 Hz - 18 kHz @ 44.1 kHz Sample Rate / 192 kbps MP3
40 Hz - 16 kHz @ 44.1 kHz Sample Rate / 128 kbps MP3
40 Hz - 14 kHz @ 44.1 kHz Sample Rate / 48 kbps MP3
Playback Formats MP3
Speaker Yes
Speaker Size 0.4 x 0.2"
Power Output 150 mW
Display Size/Type LCD Backlit
Erase Protect Yes
Message Folder 400 (Maximum)
Voice E-Mail Function Yes
On Screen Clock Yes
Safety Lock Yes
Search Cue
Easy Search
Track Mark
Battery Type 1 x Built-in Rechargeable Lithium-ion Battery
Battery Life (approx.) Playback: 19 Hours @ 44.1 kHz 16 Bit PCM (WAV)
Playback: 17 Hours @ 44.1 kHz 192 Kbps MP3
Playback: 19 Hours @ 44.1 kHz 48 Kbps MP3
Internal Memory Installed: Flash Memory - 4 GB
Available: Flash Memory - 3.2 GB
Compatible Memory Cards microSD
Connectors 1/8" mini Female Headphone Out
1/8" mini Female Microphone In
USB USB 2.0 (A)
System Requirements Windows XP (SP3), Vista (SP2), 7, 8 
Mac OS X 10.3.9 to 10.8
Dimensions (WxHxD) 1.6 x 4.3 x .6" (40.64 x 109.22 x 15.24 mm)
Weight 2.89 oz (82 g)
Packaging Info
Package Weight 0.45 lb
Box Dimensions (LxWxH) 6.1 x 4.4 x 1.3"
Sony ICD-SX733 Digital Flash Voice Recorder
  • USB Connection Support Cable
  • Stereo Headphones
  • Carrying Case
  • Stand
  • Limited 1-Year Warranty

    by PowerReviews
    SonyICD-SX733 Digital Flash Voice Recorder

    (based on 1 review)

    Ratings Distribution

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    Reviewed by 1 customer

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    (7 of 7 customers found this review helpful)


    Noisy preamp

    By Jean

    from Malaysia

    About Me Budget Shopper

    Comments about Sony ICD-SX733 Digital Flash Voice Recorder:

    The sony ICD-SX733 came together with headphones and a soft protection bag.

    Pro: very well-build, small size fits easily in a pocket, integrated retractable male USB plug
    Contra: Noisy pre-amp (hiss)

    The item is perfect to record and transcribe a lecture but the preamp has, with integrated and external microphones, too much hiss for a direct use in quality voice over and "you tube" productions. The poor quality of the preamp makes the advertisement of "CD quality" misleading for an item that is dedicated to microphone recording.
    However, hiss can be reduced to acceptable levels using the integrated noise reducing filter and post production treatment. I am using the sx733 with an Azden EX-503 lav microphone and post production treatment (audacity).

    • Primary use:
    • Personal

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