Description
This dongle drastically upgrades smartphones. The Cayin RU7 is a USB DAC and headphone amplifier in one, designed to offer a powerful alternative to the normally weak headphone outputs of mobile devices. .
Connected to the USB interface of mobile phones and tablets, the Cayin RU7 converts the songs stored on them or streamed from a music service with the precision of a 1-bit discrete resistor network DAC developed by Cayin.
The RU7 meets the high expectations of demanding hi-fi enthusiasts for mobile music playback and compensates for the limited audio capabilities of smartphones, computers or tablets. To do this, the DAC is simply connected to the USB-C port. Once connected between the playback device and the headphones, the RU7 then takes over the conversion of the digital audio stream into an audible analogue signal.
Signal conversion is carried out by a 1-bit discrete resistor network in a conductive structure with 128 thin-film resistors, arranged in four groups of 32 resistors each, which has already proven its excellent performance in the current Cayin N7 DAP. The DAC also processes PCM signals up to 384 kilohertz and DSD streams up to DSD256.
The RU7 features a 3.5 mm jack socket and a 4.4 mm balanced Pentaconn connection. The sound quality of the four-channel symmetrical technology can get even more out of high-resolution material with the right headphones. The jack connection has an output of 160 mW and the balanced output even 400 mW. The impedance is 32 ohms on both connections. Even performance-hungry headphones should be able to play nicely with the RU7.
The simple, elegant design of the dongle-style mobile converter is also impressive. The rounded edges and black finish ensure a stylish look. The OLED display, with a resolution of 128×64 pixels, provides accurate information on data speed and playback volume.
Accessories include a leather case. There are also magnets with which the DAC can be securely attached to the smartphone case without leaving any residue. With the included USB-C cable, the RU7 can be easily connected to Android smartphones or iPads. A USB-A adapter completes the set.















Agustín del Pozo Luna (verified owner) –
A superb dongle/DAC, with surprisingly powerful output and a sound rich in nuance, offering a wide soundstage and incredible separation of instruments. I was already familiar with its predecessor – in fact, I own the RU6 – so I was confident in my purchase.
The shop as always, fast purchase process, prior communication to confirm stock and at home enjoying it within 48h.
Bomb-proof packaging and details you wouldn't expect.
I will keep buying without a doubt.
Thank you.