Four-side rendering of the Radique Audio RA-Twin II bluetooth adapter for vintage stereo, showing compact design, input/output ports, and controls—ideal for upgrading classic audio systems with modern streaming.

RA-Twin II in a human hand to show scale

Radique Audio

RA-Twin II Bluetooth Adapter for Vintage Stereo – Receiver & Transmitter

Q: Is there a manual in French?

Yes. The full manual is online in English and French , each with a printable PDF.

$39.00

Add Bluetooth to any vintage stereo, amplifier or car stereo, or send your TV or stereo to Bluetooth headphones. Tiny but mighty, and set up in minutes.

RX, TX and Mobile (microSD) modes
Bluetooth 5.4, up to 10 m range
Up to 10 hours per charge, USB-C
Clear online manual in English & French
1-year warranty, Ottawa-based support

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Description
Additional information

Description

Radique Audio · Tiny but Mighty

The Bluetooth adapter for vintage stereo that just works

Stream from your phone to any vintage receiver, amplifier or car stereo, or send your TV or stereo to Bluetooth headphones. The RA-Twin II is pocket-sized, rechargeable, set up in minutes, and backed by our team in Ottawa.

Three modes Why the RA-Twin II Videos Gold Series upgrade RA-USB charger Specs FAQ Manual

The short answer

The RA-Twin II is a pocket-sized Bluetooth 5.4 receiver and transmitter from Radique Audio. In RX mode it adds Bluetooth streaming to any vintage or modern stereo, amplifier or car stereo with a line-level input (AUX, tape, tuner or CD). In TX mode it sends sound from a non-Bluetooth source to Bluetooth headphones or speakers. In Mobile mode it plays MP3s from a microSD card. Up to 10 hours per charge over USB-C, a 1-year Radique Audio warranty, and a clear online manual in English and French.

One adapter, three ways to listen

Slide the switch to match the job. For RX or TX, ask one question: which device has Bluetooth?

RX · Receive Most popular

Phone to vintage stereo. Plug the RA-Twin II into your receiver, amplifier or car stereo and stream Spotify, Apple Music, podcasts or your own library from your phone, tablet or laptop.

TX · Transmit

Stereo or TV to Bluetooth headphones. Plug it into your stereo’s or TV’s audio output and listen on wireless headphones or a Bluetooth speaker, with nobody else disturbed.

Mobile · microSD

No phone needed. Load a microSD card with MP3s and it becomes a tiny music player for jogging, skiing or travel, with wired or Bluetooth headphones.

“I just received my RA-Twin II today… I can’t tell you enough how thrilled I am with this little but mighty product. I am using it to stream music from my laptop’s 400+ GB collection to my Marantz 2220b, also sourced through the wonderful people at Radique. You people rock — keep up the good work!”

Kevin · Google Review

Why the RA-Twin II

Made for vintage gear

The included RCA cable plugs into the inputs almost every classic receiver and amp already has. A ¼” TRS option connects through a headphone jack, and a 3.5 mm cable fits car stereos and AUX inputs.

Bluetooth 5.4

A modern, stable connection with up to 10 m (33 ft) of range in line of sight, and low latency for TV and video.

Up to 10 hours per charge

About 2 hours to charge over USB-C, and it switches itself off after 10 minutes without a source to save the battery.

A pocket MP3 player too

Cards up to 64 GB (about 15,000 songs), including most podcasts and audiobooks. Only 60 × 25 × 13 mm and 15 g.

A manual you can follow

A clear, step-by-step online manual in English and French, with a printable PDF and troubleshooting for every mode.

Real support, 1-year warranty

Questions go to our Ottawa team, not a call centre. And every RA-Twin II helps keep a vintage system playing instead of heading to landfill.

See it in action

Two short videos from our YouTube channel.

Easy setup with a vintage stereo

Step by step: connecting the RA-Twin II and streaming from your phone.

Unboxing and how it works

What’s in the box, and the adapter at work in both modes.

Upgrade to the Gold Series and save

The RA-Twin II comes with a basic cable. Our shielded Gold Series cables are a real step up in sound and shielding, and cost less when bundled.

Gold Series RX Bundle

The RA-Twin II plus our Gold Series 3.5 mm to dual RCA cable: the best way to stream from your phone to a stereo or amplifier. See the RX bundle

Gold Series TX Bundle

The RA-Twin II plus our Gold Series ¼” to ⅛” TRS cable, to send a vintage amp’s headphone output to Bluetooth headphones or speakers. See the TX bundle

Pro tip: keep your amp quiet after streaming. In RX mode the RA-Twin II switches itself off after 10 minutes without a connection. If your amplifier is still on and set to that input, the basic cable can then act like an antenna, and the amp may play noise or distortion. The easy fix: turn the amp off or switch it to another source when you’re done. The permanent fix: our Gold Series 3.5 mm to dual RCA cable, whose heavier shielding stops the noise even after the RA-Twin II switches off.

Radique Audio RA-USB charger plugged into the AC outlet on the back panel of a vintage receiver

Keep it charged at your stereo: the RA-USB

A huge range of vintage receivers and amplifiers have AC outlets on the back panel. Plug our RA-USB multi-port charger into one and your RA-Twin II stays charged right where it lives, with no extra wall outlet and no stray adapter.

With three USB-A ports and a 20 W USB-C port (50 W total), it charges your phone, tablet or earbuds at the same time. It’s also a compact travel charger.

Shop the RA-USB →

What’s in the box & specifications

In the box

RA-Twin II Bluetooth receiver / transmitter
Basic dual RCA to 3.5 mm cable
USB-C charging cable
Insert card with a QR code to this page, where you’ll find the manual and our videos

Want the Gold Series cable instead? The RX bundle and TX bundle save you money over buying separately.

RA-Twin II
Bluetooth	V5.4 EDR · A2DP, HSP, AVRCP
Range	Up to 10 m (33 ft), line of sight
Modes	RX (receive) · TX (transmit) · Mobile (microSD)
Battery	Up to 10 h · about 2 h to charge (USB-C, 5 V / 1 A)
microSD	Up to 64 GB · MP3
Size	60 × 25 × 13 mm (2.36 × 0.98 × 0.51 in)
Weight	15 g (0.53 oz)
Warranty	1 year, Radique Audio

RA-Twin II questions

Will the RA-Twin II work with my vintage receiver or amplifier?

Yes. Any stereo with a line-level input works: AUX, tape, tuner, CD or video. Plug the included RCA to 3.5 mm cable into that input, set the RA-Twin II to RX mode and pair your phone. Don’t use the phono input; it’s designed for a turntable’s much smaller signal.

Can I use it in my car?

Yes. In RX mode, connect it to your car stereo’s 3.5 mm AUX input with a 3.5 mm to 3.5 mm cable (not included) and stream from your phone. The built-in microphone handles hands-free calls; mount the RA-Twin II near your mouth, on the dashboard or sun visor.

Can I listen to my TV or stereo on Bluetooth headphones?

Yes, in TX mode. Connect the RA-Twin II to the TV’s or stereo’s audio output (not an input), put your headphones in pairing mode, and it pairs automatically. For a vintage amp’s headphone jack, use a ¼” to ⅛” TRS cable such as our Gold Series.

How far does it reach, and how long does the battery last?

Up to 10 m (33 ft) with line of sight, and up to 10 hours per charge. A full charge over USB-C takes about 2 hours.

Can I keep the RA-Twin II charged at my stereo?

Yes. Many vintage receivers and amplifiers have AC outlets on the back panel. Plug our RA-USB multi-port charger into one and charge the RA-Twin II over USB-C right at the stereo, with ports to spare for your phone.

Why does my amp make noise after I stop streaming?

After 10 minutes without a connection the RA-Twin II switches itself off, and if the amp is still on and set to that input, the basic cable can act like an antenna. Turn the amp off or switch it to another source when you’re done, or upgrade to our Gold Series 3.5 mm to dual RCA cable, whose heavier shielding stops the noise.

Is there a manual in French?

Yes. The full manual is online in English and French, each with a printable PDF.

Do you ship the RA-Twin II to the United States?

Yes. On Radique Audio products we add the US import duties and fees at checkout and prepay them for you, so there’s nothing to pay at delivery.

What warranty does it have?

A 1-year Radique Audio warranty against defects, with support from our team in Ottawa. See the warranty FAQ.

Set up in minutes, supported for years

Everything you need to get going is in the manual, and our team is a message away.

RA-Twin II manual Manuel en français Email sales@radique.com

$39.00

Additional information

Weight	0.2 lbs
Dimensions	10 × 8 × 1 in

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