Mass Fidelity Relay Hi-Fi Wireless Bluetooth Receiver Review

Sound quality of Bluetooth wireless music has got more attention than before, recently a HiFi standard Bluetooth receiver by Mass Fidelity has launched with the name "Relay". After reviewing this receiver, I can finally use the words "Bluetooth" and "high-quality audio" in the same sentence.





Relay Bluetooth Receiver_1

Costly Hardware

Streaming music wirelessly from your smartphone to any sound system in True high fidelity is only aim of Mass Fidelity. They dedicated themselves to this the last three years, and they finally brought us this Hi-Fi Wireless Bluetooth Receiver. Relay is excellent in every respect, its hardware is totally different compared with those products under 100 bucks. Home electronics, other wireless devices and fluorescent lights can produce electromagnetic radiations when operation. If that radiations were picked by a wireless receiver without filtering mechanism, the noise like "buzz" is given out as a result. Relay’s Grounding Scheme includes three separate ground domains and a bulk decoupling capacitor to eliminate any possible radiations or ground loops, which may effect the signal transmission. A legendary and costly 24-bit Digital to Analog Converter (DAC) module, Burr-Brown 5102 is built to deliver a solid 2 Volts RMS output power to your analog Hi-Fi system. That module usually can be found in top shelf audiophile speakers and Blu-ray players. A 2.2DB external high gain antenna for extending the transmit range is included, which ensures a reliable and stable link. Relay also has AptX, a superior digital audio codec used in later-generation smart devices (particularly Android OS). The creator of Relay tried everything useful to ensure the device they made is a HiFi device not a generic low quality receiver.

201312_relay_insideRelay Bluetooth receiver

Great HiFi sound

Hardware and designing only entitle the potential of good sound, then an AB testing with Logitech Bluetooth adapter was performed as any good reviewer would agreed. I run the test using my DENON D-F107 micro component system, which is not so good but with 192kHz/24-Bit enough for the comparison. The Relay streams both AAC and Apt-X over Bluetooth. In order to get the best possible quality streaming, apt-X must be supported by both source device and receiver. So I chose apt-X enabled MacBook Pro to do the primary streaming work. The apt-X Bluetooth stream really sounded good, the vocals matched up perfectly as did the bass and guitar, the bass seemed pretty on streaming lossless files. a suspicious "hint" of the top frequency response had be detected when aptX stream, but it was very subtle and I’m not sure when play back. I played more and more tracks, I have to say it sounds really good. When it came to Logitech receiver,stream the sub-band coding of the A2DP Bluetooth stream. it sounds flat and lifeless compared to the better aptX stream, so keep that in mind.  Relay won test with a true HiFi sound, which I had not expected when I began the AB testing.

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Unique Connectivity


Relay provide the listener an unique connectivity method using two gold-plated switchable RCA connectors. They can operate either as analog or digital outputs. The receiver integrates well with any Hi-Fi audio system. You just connect the stereo analogue outputs on the back to your AV receiver with supplied RCA-RCA signal cable or RCA-mini cable. Anyone who prefers to digital output can do the reversion by pashing and holding the rear-panel control button for about 5 seconds, then switch the analog output into 24 bit S/PDIF digital output mode. Outboard DAC or surround receiver can be connected through either output jack to digital inputs of them. Relay can feed two digital streams at the same time. For example you can feed one digital output to a surround receiver or primary DAC and the other to a headphone amp or etc.

Solid Beauty



A solid block of aerospace grade aluminum with elaborate manufacturing is milled out for the box, and those really nice rounded corners that makes it look like something Apple style. It matches perfectly at home sitting next to even the costliest and most attractive home audio components. There’s nothing wrong with showing off your cool stuff. Even though it’s small enough to hide away you’ll want to display it proudly out in the open.

Social function

Party Pairing TM technology bring the social element to Relay.   Every people at the party is allowed to take turns being the DJ by the amazing tech! It’s a global jukebox only limited by the amount of music you and your friends can tap into from both stored music files or streaming services.


The Relay has a combination of advanced hardware and firmware, it preserves all the musical detail, dynamic range and full bandwidth response. This Hi-Fi Bluetooth wireless receiver works great and will stream high quality audio to your existing stereo system, so you can walk around without docking or wiring anything. Enjoy all your digital music on your favorite sound system, whether it’s stored locally or streaming from the cloud. This beautiful and power device is helpful to eliminate the prejudice of bluetooth wireless music, It is not merely a collection of low quality sound any more. The emotion-packed artistic expression can be used to describe the wireless sound quality from now on. Overall, I really like this little aluminum box. If you don’t want for only half of your music’s performance and have a desire for True HiFi sound. This is something you can not afford to miss!


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John Michaud
Review Date
Reviewed Item
Mass Fidelity Relay Hi-Fi Wireless Bluetooth Receiver
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  • peter flower March 22, 2014 at 11:32 am - Reply

    i recently bought the relay from you on line. bought it so we could use mac book pro, pc, iphone, ipada all on bluetooth. Everything connects fine and workED.. but now the macbook pro finds the relay but will not connect. can u let me know how i might overcome this.

    • portablehifi March 23, 2014 at 3:08 am - Reply

      I am very glad to hear you get this gadget after reading my review,and I am very sorry to know there is a connection problem with mac pro.If it works well for other source device maybe it is caused by some software on your Mar Pro, Have you ever install some program recently ? Remove it for a try. Sometimes reset the Relay can give a reconnection.

  • Charles Dray March 30, 2014 at 3:16 pm - Reply

    I bought an Arcam rblink before the Mass was released and I noticed that the rblink only got 4 stars. Would you consider the Mass as an upgrade to the Arcam? What can explain the 1 star difference?

    • John Michaud April 2, 2014 at 9:14 am - Reply

      Hi Charles:
      You are right these 2 items are similar in functionality. They select the same chip to perform DAC job. And they are both elegant design product. I discuss with Paul E Parker about rBlink and Mass Relay. And we both appreciate the wonderful aluminum box and the arrangement of outputs of Relay.For this reason rBlink is rated 4 stars and Realy for 4.5 stars. None of them is given 5 stars because the price is also one feature affecting the rating scores. For sound quality, they are just marvelous far better than others worth every penny.

  • Charles Dray March 30, 2014 at 3:25 pm - Reply

    Peter I got quite the same issue with my MacBook Pro and my Arcam rblink. Often need to pair again the device or restart the Bluetooth on the Mac, really annoying…never occurs with IPhone , I’m hoping this will go away once OS on Mac is upgraded (still running Lion)

  • peter loader July 8, 2014 at 6:50 am - Reply

    i am wanting supply of the mass fidelity bluetooth receiver, in Australia and have left msgs with manufacturer although no reply, can you pls supply a unit ? shipped to surry hills nsw 2010 sydney

  • Renato July 10, 2014 at 4:34 am - Reply

    In your review you did not specify what material you were streaming, was it mp3 content? Flac content? What bluetooth standard does the device support? What is its max supported bitrate?

    Thanks for helping.

    • John Michaud July 10, 2014 at 7:24 am - Reply

      Thank you for your comment. I choose high quality MP3 files and some FLAC tracks in my review. This unit owns to a aptX® enabled CSR Bluetooth V4.0 module to support Both apt-X and AAC codecs.The highest Bitrate under this situation is 380Kb/s.

      Source device
      SBC(Subband Coding) codec Most smart devices with Bluetooth 128Kbit
      AAC streaming iPhones
      Old Android phones
      aptX New Android phones
      Macbook pro
      USB Dongles released by Creative and Sennheiser
  • content July 27, 2014 at 3:57 pm - Reply

    Very interesting info!Perfect just what I was looking for!

  • Peter August 25, 2014 at 6:38 am - Reply

    What is the range of the Bluetooth receiver?
    Does it require direct line of sight?
    i am looking for 100 ft without line of sight.

    • portablehifi August 26, 2014 at 6:09 am - Reply

      This is a class 2 bluetooth receiver, so the range is about 30 feet like the most others in this category. If you want some thing can work for 100ft, the only theoretical device will be Sony BM10 Bluetooth receiver

      And for any bluetooth device line of sight is not necessary for a vivid link, but no obstacle in between will be better for signal strength.

  • dellacrist January 16, 2015 at 7:03 pm - Reply

    Wow! Finally I got a website from where I be capable
    of in fact obtain helpful information concerning my study and knowledge.

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