Mass Fidelity Relay - Audiophile Bluetooth receiver

Mass Fidelity Relay – Audiophile Bluetooth receiver


Message for buyers

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Product Description

The missing link – The first and only Audiophile quality Bluetooth receiver.

We were highly sceptical about such a machine until we back 2 backed it with a serious CD player and whilst a really good CD player is still better, only the most attentive blind folded listening test could detect it.

Use it to connect  a tablet or laptop into your HiFi  and all the pleasure and convenience of “on the go” music can be allied to your proper HiFi, not some tinny plastic box…. fabulous development!

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

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.

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.

Additional Information