Sound Devices A20 Mini Transmitter

Sound Devices A20 Mini Transmitter
Sound Devices A20 Mini TransmitterSound Devices A20 Mini TransmitterSound Devices A20 Mini Transmitter
Sound Devices A20 Mini TransmitterSound Devices A20 Mini TransmitterSound Devices A20 Mini Transmitter
Please note: This product can only be shipped to certain territories, please contact for more information

Sound Devices A20 Mini Transmitter

Sound Devices’ first miniature transmitter incorporates state-of-the-art features such as full remote control via the A20-Remote app, GainForward Architecture, internal 32-bit float recording, a worldwide tuning range of 470 MHz – 694 MHz, and more. The A20-Mini is fully compatible with Sound Devices/Audio Ltd existing A10 Digital Wireless System.

Key Features:

  • Full remote control of the Mini via A20-Remote companion app. Control frequency and RF power, turn the Mini on and off, start and stop recording, mute the microphone, format the media, view the status of all your Minis, and more.
  • GainForward Architecture: set the Mini’s gain levels via trim control (with an 8-Series) or at the A10-RX (other mixers).
  • Full 10 Hz – 20 kHz audio bandwidth; 100% digital RF modulation and transmission. Same excellent range and audio quality as the A10-TX.
  • Worldwide tuning range of 470MHz – 694MHz.
  • Built-in 32-bit float, 48kHz recorder with 64 GB storage for over 80 hours of record time.
  • Offload recorded WAV files via USB-C and optionally conform/convert with SD-Utility.
  • Powering via AAA or NP-BX1 (Li-Ion) with built-in charging for NP-BX1 Li-Ion battery.
  • Internal supercapacitor-powered timecode generator can be jammed via USB-C.
  • Water-resistant with a rounded form factor.


The A20-Mini digital wireless transmitter combines legendary British audio quality with the best of American design. The sleek, rounded form fits perfectly into body contours and underneath tight clothing.

...and control.

Control the A20-Mini from your phone or tablet via Bluetooth 5.2 with companion app A20-Remote. Set frequency and RF power, turn the Mini on and off, start and stop recording, mute the microphone, format the media, view the status of all your Minis, and more. The A20-Mini’s high-efficiency internal 2.4 GHz antenna ensures excellent Bluetooth range.


With the Mini’s GainForward Architecture, easily set the Mini’s gain, low-cut, and limiter directly on your 8-Series. This immediate, local control of gain allows quick adaptation to changing volume levels and saves time during production.

32-bit float recording.

The A20-Mini records in 32-bit float for an astounding >130 dB of dynamic range. This allows for audio gain decisions to be made after recording, with zero loss in headroom or noise performance.

Built-in 64 GB media.

No more SD card management – the ample-sized media stores more than 80 hours of continuous, uncompressed 32-bit float recording. Simply offload the recorded WAV files via the high-speed USB-C port to a computer.

Never lose time.

The Mini’s ultra-accurate 0.2 ppm internal timecode generator can be jammed via USB-C with negligible drift over a 24-hour period.

Flexible, worldwide operation.

With a built-in 470 MHz to 694 MHz UHF tuning range, your Mini can go wherever work takes you.

Power away.

Use off-the-shelf rechargeable or AAA batteries – no adapter needed. 3 AAA batteries or a rechargeable Sony NP-BX1 give you the ultimate in powering flexibility. You can even recharge the NP-BX1 via the Mini’s USB-C.


With its extensive gasketing and waterproof connectors, the A20-Mini can easily withstand water and sweat.

Sound Devices A20 User Guide


Frequency Range 470-694MHz
Transmitters are tunable in 25 kHz steps
Available frequencies are dependent on region
RF Output Power Off
Low - 2 mW
Normal - 10 mW
High - 20mW
Max - 40mW
Modulation Mode Sound Devices proprietary digital RF modulation
Antennas UHF RF: SMA connector, removable
2.4 GHz built-in
Audio Frequency Response 10Hz - 20 kHz, +/- 1 dB re 1 kHz
Audio Input Type Lavalier Microphone via 3-pin LEMO
Pin-1 ground
Pin-2 5V bias
Pin-3 audio/bias (8k ohm to 5V)
Bias Power 5V
Input Impedance 8k ohms
Input Clipping Level +5 dBu
Dynamic Range 130 dB min (A-weighted)
Menu and Controls Power & Pair button protected inside battery compartment
A20-Remote, mobile device application of iOS, iPad and Android
Remote Control A20-Remote Android, iOS, and iPad app via Bluetooth 5.2 LE
Recording Media Internal 64 GB
10% over-provisioned for optimum performance
Recording File Format 32 Bit Float, 48 kHz, Monophonic
Broadcast WAV (<4GB), RF64 WAV(>4 GB)
Simultaneous Record and Transmit mode is not available on A20-Mini units sold or operated in the United States of America.
Timecode (LTC) Input via XL-TC-USBC-LEMO or XL-TC-USBC-BNC: 0.3 V – 3 V p-p (–17 dBu to +3 dBu), 20k ohm impedance
Output via XL-TC-USBC-LEMO:  3 V p-p, 400 ohm impedance
Timecode Cloak 0.2 ppm accuracy
Holds accurate clock for four hours while powered down with batteries inserted, holds for one hour without batteries via internal supercap 
Auto Jams timecode from LTC source via USB-C connector, or from optional PowerStation-8M
Timecode Frame Rates 23.98, 24, 25, 29.97 DF, 29.97 ND, 30 DF, 30 ND 
Frame rates are auto-detected from incoming source
USB-C Mass Storage (USB-C): USB 2.0 high speed for file transfer
Powers A20-Mini
Powering 3x AAA batteries (Energizer Ultimate AAA Lithium primary batteries recommended), or Sony NP-BX1 rechargeable Li-Ion
Built-in Li-Ion charger via USB-C (7.5 W or more needed)
Sony NP-BX1 is rechargeable via optional PowerStation-8M.
Environmental Water Resistant
Operating: -20° C to 60° C, 0 to 90% relative humidity (non-condensing)
Storage: -40° C to 85° C
Dimensions (H x W x D) 75.8 mm x 48 mm x 19 mm
2.98 in x 1.88 in x 0.74 in
Weight 51 g (without batteries)
1.8 oz (without batteries)

Battery Life

Estimated Battery Life, continuous
RF Power & Record Sony NP-BX1 3x AAA (Energizer Ultimate)
A20-Mini On, RF Power Of 8:20 9:30
RF Off, Recording 8:00 8:10
2 mW, Recording 4:30 5:10
10 mW, Recording 3:40 4:20
20 mW, Recording 3:30 4:00
40 mW, Recording 2:50 3:00
A20-Mini Off 6 months 6 months
Charge Time PowerStation-8M 2:30 Not Supported
Charge Time USB 500 mA (A20-Mini Off) 2:40 Not Supported
Estimated Battery Life, 50% off time using A20-Remote
RF Power & Record Sony NP-BX1 3x AAA (Energizer Ultimate)
RF Off, Recording 16:00 16:20
2 mW, Recording 9:00 10:20
10 mW, Recording 7:20 8:40
20 mW, Recording 7:00 8:00
40 mW, Recording 5:40 6:00


Estimates from the user guide.

Delivery Services

At Pinknoise Systems we like to offer our customers a wide choice of delivery options for their orders, and our prices are affordable and competitive. We also use only the best, most reliable couriers and delivery services to get your equipment where it needs to be - quickly and securely. Please find an outline of our services, prices and timescales below.

Delivery Times

Delivery times are based on when the package(s) leaves our premises. Sometimes, due to stock restrictions or a non-completed order, delivery may take longer as there is a delay with couriers, which is unfortunately out of our hands. If your order is urgent, or details change, please do let us know.
For full details, fees, and time schedules, please see our Delivery Information page.

Returns & Refunds

New items: You can return goods you have ordered from us for any reason, at any time within 30 working days of receipt (14 to initiate the process), for a full refund or for an exchange for a different product from our range. Items must be packed suitably and insured for full loss in the event of a delivery problem. Pinknoise Systems will not be responsible for lost or damaged return goods. Lost or damaged goods may affect the level of refund you receive. For full details of our returns policy, please click here.

£1,899.00 £2,160.00
Saving Of:  £261.00 (12%)
(£1,582.50 Exc. VAT)


2 in stock now  

2 in stock now

Delivery hours
UK ORDERS: Order soon for delivery on using our express service

Model:  SD-A20-TX-M
Manufacturer:  Sound Devices

Sound Devices
Contact us for advice

Need advice? Give us a call

(+44) 01453
825 802

International Delivery

International delivery

We ship across Europe and around the world and have a multitude of shipping options available to our international customers during the checkout, including express delivery for urgent orders.


We have a next day shipping option available for the UK with our DPD courier service, which features delivery alerts, personal delivery preferences and driver tracking with the DPD mobile app.


Spread the cost to maximise your capital. Just call our helpful sales team on 01453 825 802, from 9.00am - 5.00pm, to discuss these options and find out what's available to you.

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Sound Devices A20 Mini Transmitter

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