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Introducing The Mass Fidelity Relay

Stream music wirelessly from your smartphone to any sound system in true high fidelity.

Quest For Sound recently partnered with Mass Fidelity, makers of the Relay, a BlueTooth DAC that offers both superior connectivity and sound.  From the housing machined out of a solid billet of aluminum to the Cirrus Logic 24 bit processor and Burr-Brown DAC, the Relay delivers on all levels.

Mass Fidelity's Relay streams music wirelessly from any Bluetooth enabled device, such as a smartphone or tablet, to any audio system. It allows listeners to enjoy a limitless universe of high definition digital music through their existing hifi audio system. The Relay is a true high fidelity component that brings out the full sound quality potential that is hidden inside the Bluetooth protocol . 

list $295.00

Mass Fidelity Relay gives Bluetooth  CD-like quality !!!!

Product Detail

The perfect sound

Stream music wirelessly from your smartphone to any sound system in true high fidelity.

Bridging Hi-Fi and digital

The Relay Hi-Fi wireless receiver connects all your Bluetooth® smart devices to your existing stereo setup so you can sit back and use your device as the controller. Enjoy all your digital music on your favorite sound system whether it's stored on your device or streaming from the cloud without having to switch sources.

Welcome to the party!

The Relay is enriched with Mass Fidelity's wireless Party Pairing™ technology bringing the social element back to Hi-Fi by allowing everyone at the party to take turns being the DJ! 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 perfect sound

The Relay's output stage is accessible via gold plated RCA phono style connectors. The Relay uses a professional grade Burr Brown 24 bit Digital to Analog Converter to deliver a solid 2 Volts RMS output power to your analog Hi-Fi system.

Grounding Scheme

The Relay uses 3 separate ground domains; one for digital signals, one for analog signals, and one for radio frequency signals. Each is designed to be as 'solid' as possible. A bulk decoupling capacitor is used to remove any potential ground loops. Grid-viaing between ground layers in each ground domain, and star grounding of the three domains ensure excellent ground integrity.

Internal low-noise power supply

Linear low noise, Low-dropout Regulators and common mode input noise filtering on power supply have been implemented to improve rejection of unwanted signal noise and interference from the outside world.

System Clocking

A slew rate limited clock source is utilized to improve rejection of unwanted transient noise that would otherwise distort the audio signal thereby lowering the systems overall noise floor. An ultra stable phase locked audio sample clock is used to reduce jitter allowing the DAC render the audio signal more faithfully.

Analog output

The Relay's output stage uses a professional grade Burr Brown Digital to Analog Converter which has the following characteristics:

  • 24 bit Digital to Analog conversion
  • Signal to noise ratio: 112dB
  • Dynamic Range: 112dB
  • Total harmonic distortion: -93dB
  • Interpolation filter stop band gain: -60dB
  • Pass band flatness: +/-0.02dB
  • DC coupled output stage
  • 2Vrms power output

Wireless Performance

The Relay combines an ultra low loss SMA connector for increased range and signal stability with an external antenna for increased standing wave ratio efficiency.

High efficiency antenna characteristics:

  • 80% average efficiency
  • Maximum VSWR 1.6:1
  • Peak gain 2.2dBi


The Relay's enclosure is hewn from solid aerospace grade aluminum billet, it is the result of an elaborate manufacturing process beginning from raw materials at the smelter and ending with precision machinery executing the final surface treatments resulting in a housing for the electronics that is both functional and beautiful.


Simply plug the Relay into the AUX analog input of your existing hi-fi system and push power! No wi¬-fi network required. No platform specific software driver downloads or hardware configuration required. No pairing button or pairing codes. Scan for the device and connect!


Say goodbye to app downloads! By taking advantage of modern wireless streaming protocols the Relay doesn ' t require any external software to be added to your device in order to give you full control of the Relay!

Basic specifications

Input Power

5 Volt DC 1A

Output Power

2 Volt RMS

Compatible Power Systems

110-240 Volt

D/A Converter

Burr Brown 5102

Frequency Response


Bluetooth® Module

aptX® enabled CSR module

Bluetooth® Range

10 m


Machined aluminum


115x100x36 mm (LxWxH)


380 g

White LED






The Relay is compatible with any device supporting Bluetooth® streaming, whether it ' s a laptop (Mac/PC), tablet, or smartphone, and with all music lockers and all subscription services.

  • aptX® support
  • SBC codec support
  • A2DP support

Setting Up

Setting Up Your Relay

  1. Screw in the antenna
  2. Connect one end of the included audio cable (RCA-RCA or RCA-3.5) to the RCA jack on the Relay.
  3. Connect the other end of the audio cable (RCA-RCA or RCA-3.5) to the audio input on your hi-fi system.
  4. Connect the power supply cable to the Relay ' s DC input jack and plug the power adapter into a wall outlet.
  5. Press the power button. The white LED light will turn on to indicate the unit is powered and now ready to be paired.


Pairing Your Relay

•  Go to your phone ' s Bluetooth Manager.

Home screen
? Settings ? General ? Bluetooth

Home screen
? Settings

Tap the ON/OFF slider, located to the right of the Bluetooth field, to turn Bluetooth ON.

Other smart devices
Please refer to the device
' s instruction manual.

  1. Search listed Bluetooth devices and select Relay.
  2. Make sure your hi-fi system is turned on and that the proper input source is selected.
  3. The music on your smart device can now play through your hi-fi system!

Changing Connected Device

Let your guests take turns playing DJ at your next social gathering by allowing them to easily switch from one device to another, with the Party Pairing ™ technology:

  1. Access the Bluetooth Manager on the connected device. Tap the ON/OFF slider to turn the Bluetooth OFF.
  2. The Relay is now ready to be connected to another device.
  3. Connect a new device by following the steps in “ Pairing your Relay ” .



When connected to the Relay, it ' s best to turn the volume on your smart device fully up and then use the volume control on your hi-fi stereo system.

To guarantee the best sound experience:

  1. Pair your smart device to the Relay.
  2. Play some music from your device to ensure the hi-fi stereo system is working, and then stop the music.
  3. Turn the volume on your stereo down to the lowest volume setting.
  4. Turn the volume on your smart device to the highest setting.
  5. Play the music again and slowly increase the volume on your stereo until you've reached the maximum desired listening volume.

Now you can use your smart device to control both content selection and system volume!


Incoming calls and notifications take precedence over audio playback. To avoid such party interruptions, turn off the sound notification on your smart device.

Calls (ringtone):

Silence the volume or select vibrate.

Vibrate mode will not affect audio playback.

Email, text message, voicemail, alert, etc.:

On iPhone

  1. Home screen, tap ? Settings ? Sounds
  2. Click on the type of alert ? Select “ None ”

On Android

  1. Home screen ? Settings ? Sounds ? Volume
  2. Touch and drag the slider for desired settings ? Tap OK

Reconnecting Device

If your device moves out of the 10-meter range, or if you turn the Bluetooth feature off, the Relay will disconnect.

To reconnect, simply access the Bluetooth Manager on your device and select Relay from the list.

The Relay can connect to only one smart device at a time; however, it is capable of remembering several devices. Six devices are held in memory to facilitate TurboPairing ™ (less than 5 seconds). Once this number is exceeded, the oldest device is discarded. To add your device back into TurboPairing ™ memory, simply reconnect the device.



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