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Cyrus SoundKey Portable Headphone Amplifier Teal


Online Price

€ 89.00

Retail Price € 139.00

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Product information

Find more about Cyrus SoundKey Portable Headphone Amplifier Teal

All 4 colors are available.


Designs and specifications are subject to change without notice. 

Dimensions (W x H x D), 2.7 x 5.375 x 0.5 inches, 68 x 137 x 12 mm 
Weight, 6.2 oz, 175 grams 
Frequency Response, 20 Hz - 200 kHz 
Audio-in Level, 1 Vrms 
Line-out Level, 1 Vrms 

Recommended Headphone Impedance: 16 Ohm - 300 Ohm 

Maximum Headphone Output Power (Per Channel): 
300 mW into 16 Ohm 
220 mW into 32 Ohm 
30 mW into 300 Ohm 

Headphone Amplifier Output Impedance: 0.5 Ohm 

Output Jacks: 
3.5 mm stereo headphone 
3.5 mm stereo line-out 

Input Ports, Analog: 3.5 mm stereo audio-in 
Digital: USB A for iPod / iPhone / iPad; USB micro-B for smartphones with USB OTG feature and computers. 

DAC Chip: ESS Sabre32 Reference ES9028-Q2M 

Input Format: 
Stereo PCM, Stereo DSD (DoP v1.1 or native) 
PCM Sampling Frequencies, 44.1 kHz  -  384 kHz, 16 / 24 / 32-bit 
DSD Sampling Frequencies, 2.8224 MHz (DSD64), 5.6448 MHz (DSD128), 11.2896 MHz (DSD256, native mode only) 

USB 2.0, USB Audio 2.0 

Included Accessories: 
Power Supply Unit (Rapid Charging Charger) 
USB A - USB micro-B data and rapid charging cable 
USB A - Lightning data cable (for Apple devices) 
USB micro-B to micro-B data cable (for Android and other smartphones) 
3.5 mm - 3.5 mm stereo audio cable 
Silicone rubber band (2 pieces) 
User guide and warranty documents 

Built-in Battery type, 3000 mAh lithium polymer rechargeable battery 
Battery Operation Time, Approx. 13 hours for analog source via Audio-in; approx. 7 hours for digital sources via USB 

Charging Time: Approx. 1 hour 30 minutes 

Put simply, Cyrus’ soundKey improves your music...vastly 

You think the sound is ok when you plug your expensive headphones into your phone? Wait until you hear this!

To explain a bit more scientifically, music is stored on your phone in various types of digital files. The DAC (Digital-to-analogue Converter) in most phones, laptops and tablets is designed to hit a cost – that means it’s never going to deliver the kind of audio quality that your music files or streaming services are actually capable of delivering.

SoundKey unlocks your audio, by accessing the raw digital files on your device and processes them using our special hi-fi DAC and amplifier. The analogue music output from soundKey delivers much more detail, more impact, greater precision and a good dollup of WOW.

How is soundKey different to other DACs?

Firstly, the size and design. If you are using your phone as your source of music, you are likely to be on the move. Therefore, being small and lightweight is key. The Cyrus soundKey weighs around 16 grams, so it’s no extra burden on your pocket or bag. From a design perspective, smooth rounded edges enable it to feel more like an integral part of the cable without catching or snagging on anything.

Secondly, the Cyrus soundKey has been designed to be an extremely low current device. Why is this important? We have deliberately not put a separate battery inside the Cyrus soundKey to keep it small, light and prevent you from having yet another thing you need to charge. Therefore it relies on the battery in the phone to provide it with power. The more power an external DAC draws, the quicker it will drain your phone battery. Other DACs typically drain 100mA - Cyrus soundKey has been designed to draw only 50mA.

Finally, it’s made by us, Cyrus. We have over 30 years of designing and tuning audio components to bring the very best out of a product, and provide a better music experience for our customers.

Q. Which devices is Cyrus soundKey compatible with?

Android: OTG compatible devices, running OS 5.0 (Lollipop) and above

Apple: Devices running iOS 7.0 and above, using the Apple Lightning to USB Camera Adapter

Windows Phones: USB dual role devices, running Windows mobile 10 or later

Laptops: Works with any computers with USB connection

Q. What headphones will the Cyrus soundKey drive?

Headphones with impedances between 16 & 64 Ohms.

Higher impedances will work, but will not be able to be louder

Q. What is the output power of the soundKey?

2 x 138mW into 16 Ohms at 1% THD+N.

Q. Will the Cyrus soundKey work with Bluetooth wireless headphones?

No, the soundKey is designed to work with wired headhphones.

Q. How much power does the soundKey use?


Q. What quality files can the soundKey play?

Can handle High Resolution audio files up to 24bit/96kHz.