Two kinds of Wireless


Is high quality stereo possible with wireless loudspeakers? It depends. The Davone "all-in-one" music system Meander connects to the internet over WiFi and streams music with excellent stereo quality. But stereo reproduction from two seperate loudspeakers, each with their own WiFi connection, is more difficult. Now two independent music streams are downloaded. Playback can not be timed perfectly between both loudspeakers and this leads to audible shifts in stereo imaging.

WiSA is an alternative form of wireless audio that enables perfect timing for not only stereo, but also multichannel. But WiSA is not connected to the internet. It basically replaces the loudspeaker cable with a wireless transmitter and a wireless receiver, which is build into the loudspeaker. An external source of music needs to be connected to the WiSA transmitter before you can enjoy high quality stereo wirelessly.

Davone Wireless Module


Fully developed in-house, our WiSA wireless amplifier module can transform the Studio, Twist and Solo into superior wireless loudspeakers. But even though WiSA wireless only replaces the loudspeaer cable, the Davone wireless module has the amplifiers build into the loudspeaker. This means the analog cross-over can be replaced with a more accurate digital cross-over. This filters the signal before it goes into the amplifiers. Now the amplifiers only have to amplify the filtered signal and they can be connected directly to the individual drivers. Compared to analog speakers you will quickly hear more control, more dynamics and more silence.

What do you need?


Unlike streaming music directly from the internet over WiFi, WiSA enables a high quality stereo or multichannel wireless audio system. WiSA wireless is not connected to the internet so you need to connect a music source to the WISA wireless transmitter like for example the SoundSend, to for example a WiFi music streamer from Bluesound, Sonos or Heos. Now you are all set for high quality stereo music streaming. For a detailed WiSA transmitter feature overview read this.



  • Crystal clear sound

    The Quad core DSP enables independent corrections of amplitude and phase, impossible in analog speakers. Aided by the ASRC and low jitter clock, the data is processed at least at 96kHz/24 bits throughout, finally to be converted to analog by the ultra low distortion AKM DAC with balanced outputs.

    ICEPower Class D

    ICEpower amplifiers combine superior sound quality with high continuous output power. And by connecting it direct to the individual loudspeakers, the high signal quality is fully maintained. A step up compared to analog loudspeakers.

    Dolby Atmos Multichannel

    If you’ve ever wanted a true 5.1 or 7.1 surround system, but have hesitated because of the wiring requirements, WiSA is for you. The WiSA SoundSend enables Dolby Atmos and lower versions decoding.

  • Connect to all TV's

    The WiSA SoundSend HDMI-ARC input can be connected to virtually every TV manufacturer out there, including B&O, Sony, Samsung and many others. The TV remote will also change the loudspeaker volume.

    Multiroom

    Some WiSA transmitters come with Chromescast and Airplay 2 built in, making it possible to create a multiroom system with virtually every sound manufacturer out there, including B&O, Sony, Bose and many others.

    A Wireless Standard

    WiSA is the growing standard in wireless audio transmission, with support from more than 60 manufacturers including LG, Toshiba, Klipsch, and Bang & Olufsen. In other words, Wisa enables wireless connections between audio products from different brands.


The Davone Module in Detail





The Davone module is a so called mixed signal PCB design, meaning it has both analog circuits and digital circuits on a single board. Through a careful lay out of components and multipoint high frequency grounding, the mixing of analog and digital signals is avoided while retaining the shortest signal paths. The main components are highlighted below:

  1. The microcontroller is the brain of the Davone module. It's large memory contains the entire DSP and functional program, also called the firmware, written by Davone. This way the often used separate EEPROM memory is avoided and replaced with the internal memory of a microcontroller. This is much better protected against unpredictable power supply swings and therefore more reliable as long term memory storage. During normal operation, when a music signal is detected, it programs the DSP and checks if it is functioning well. If the temperature is within the set limits, it will program the DAC and unmute the amplifier. It will continuously monitor the presence of the mains power and the status of the input signal and act accordingly to ensure stable and noise free operation and reduce power consumption whenever possible.

  2. Quartz Crystal Oscillator for low jitter, packaged in ceramics with metal lid for high precision and reliability. The oscillator signal is used to generate a clock signal which is fed into the DSP's dejitter circuits to guarantee that jitter related clocking errors are avoided. The master clock output of the DSP is fed directly into the DAC with a jitter less than 100ps rms.

  3. Within the 32 bit Digital Signal Processor, the wireless received signal is first routed into the Asynchronous Sampling Rate Converter (ASRC) to minimise jitter. Then the signal is filtered with a FIR filter into the high and low bands and also small imperfections of the drivers are removed.

  4. The high performance 32 bit Velvet Sound AKM Delta Sigma DAC is handling the conversion to analog. The power is supplied through ultralow noise linear regulators and ample capacitance of different types for a virtual battery like performance.

  5. The fully balanced output stage minimises noise and is connected directly to the balanced input of the ICE power amplifier.

  6. The multipoint high frequency ground ensures lowest impedance returns paths to ground for high frequency noise and effectively prevents ground loop noise.


High Frequency Design





High frequency digital signals above 1 MHz, like for example the master clock, need to be routed carefully to maintain high signal integrity. Ideally the connections should be short and direct, but often this is not possible because another signal line crosses it’s path. Textbook four layer print design would divert the trace through a so called via to the bottom layer to cross the obstacle. The second and third layer are used for the ground and power supply planes and therefore already occupied.

However, in high frequency circuit design it is vital to keep the distance between the forward and return current traces at a minimum (the path of least inductance). It is therefore much better to route the forward current through the third layer instead of the fourth. That way the return current only has to switch sides on the second layer instead of also jumping planes through one extra via with possible added ground plane noise as a consequence. The improved high frequency current flow is shown in the image above and explained below.

  1. Trace on top layer of Printed Circuit Board (PCB). High frequency forward current shown in red flows at underside of trace.

  2. A small copper tube, or so called "via", connects the top and third layer. The via's are visible at the top of the PCB as tiny holes. The forward current flows at the outside of the via.

  3. Trace on third PCB layer. The high frequency forward current in red now flows at top of trace.

  4. The Second PCB layer is a continuous plane at ground potential. The return current in blue flows at the bottom of the plane nearest the forward current on the third layer, following the path of least inductance.

  5. Around the via, the return current now simply switches sides of the ground plane. The distance between the forward and return current is minimal at all times and signal integrity is optimal.

  6. Bottom layer of PCB. This is where normally the forward current trace would be routed to.




  • Frequency response

    40-22000Hz


    Amplifier

    2x100 Watt ICEpower class D


    7" Mid woofer

    low distortion driver with a special fibre blend cone with optimal balance of stiffness, damping and density. Symmetric motor structure for optimal drive force symmetry.


    1" Tweeter

    Anodised aluminium dome, flow optimized vented pole piece with non-reflective chamber, saturation controlled motor system.


    Sound processing modes

    Speaker position free/wall/corner with woofer/tweeter dynamic enhancement and protection. Xpert mode for maximum linearity.


  • Wireless connection

    WiSA lossless transmission up to 96 kHz / 24-bit


    Digital processing

    Quad core ADAU 1452 DSP/ AKM 4490 Velvet sound DAC


    Standby power consumption

    Watt


    Cabinet Construction

    6 layer beech wood form pressed veneer


    Weight

    9.7 kg / piece


    Height / Width / Depth

    36 / 24 / 30cm


    Designer

    Paul Schenkel
    Debby van Hal




  • Frequency response

    35-22000Hz


    Amplifier

    2x100 Watt ICEpower class D


    Standby power consumption

    Watt


    7" Mid woofer

    low distortion driver with a special fibre blend cone with optimal balance of stiffness, damping and density. Symmetric motor structure for optimal drive force symmetry.


    1" Tweeter

    Anodised aluminium dome, flow optimized vented pole piece with non-reflective chamber, saturation controlled motor system.


    Sound processing modes

    Speaker position free/wall/corner with woofer/tweeter dynamic enhancement and protection. Xpert mode for maximum linearity.


  • Wireless connection

    WISA lossless transmission up to 96 kHz / 24-bit


    Digital processing

    Quad core ADAU 1452 DSP/ AKM 4490 Velvet sound DAC


    Cabinet Construction

    The twisted side panels are made from 7 layer beech wood form pressed veneer for increased stiffness and a unique appearance from all viewing angels. The form pressed baffle is made from 10 layers HDF


    Weight

    17.7 kg / piece


    Height / Width / Depth

    96 / 24 / 27cm


    Designer

    Paul Schenkel
    Debby van Hal




  • Frequency response

    27-22000Hz


    Amplifier

    2x100 Watt ICEpower class D


    Standby power consumption

    Watt


    Woofer

    8” , Geometrically reinforced aluminum cone, soft low damping rubber surround, rigid die cast alu chassis with extensive venting


    Mid range Driver

    4", Ceramic coated aluminium membrane, soft low damping rubber surround, optimized low distortion motor system


    Tweeter

    1", Anodised aluminium dome, flow optimized vented pole piece with non-reflective chamber, saturation controlled motor system


  • Wireless connection

    WiSA lossless transmission up to 96 kHz / 24-bit


    Digital processing

    Quad core ADAU 1452 DSP/ AKM 4490 Velvet sound DAC


    Sound processing modes

    Speaker position free/wall/corner with woofer/tweeter dynamic enhancement and protection. Xpert mode for maximum linearity.


    Cabinet Construction

    10 layer beech wood form pressed veneer with multiple internal stiffeners.


    Weight

    31 kg / piece


    Height / Width / Depth

    109 / 38 / 38 cm


    Designer

    Paul Schenkel
    Debby van Hal







Please check out the Wireless FAQ page