CONCERO Mode Selection
CONCERO is powered over USB.

• If CONCERO detects an active host on the USB connection
  then it enumerates  (that is, informs the host that it is an
  audio device and requests that the driver be connected)
  and enters ‘USB DAC’ and ‘USB to SPDIF Bridge’ mode.

  Normally, powered by an active host, CONCERO will
  output audio to both SPDIF out and Analog out at the same
  time. We expect that most of our customers will use one
  or other of the outputs. However, if you choose to use both
  outputs (perhaps directing Audio output to your headphone
  driver, and SPDIF output to your power amplifier) we provide
  a means to enable one or the other via the Apple IR Remote.
  (See below).

  The display LED will remain red until data begins to stream
  from the USB host, at which point the LED turns blue.

• If CONCERO does not detect an active host (that is, if it finds
  that it is plugged into a power-only USB) then
  CONCERO enters ‘SPDIF Dac’ mode.

CONCERO and the Apple IR Remote
CONCERO responds to the Apple IR Remote (without the need
to ‘pair’ with it).

• Pressing the menu button cycles through the filter settings:
  Initially no filter is applied: the CONCERO processes
  data bit-perfect. Whatever data is received is sent to
  the DAC and/or SPDIF unmodified. In this mode the
  display LED will be blue while music is playing.

  * On the first menu press CONCERO engages the IIR
  up-sampling filter.
  * On the second menu press CONCERO engages the
  Apodizing up-sampling filter.

  Note that both filters up-convert 44.1kS/s and 48kS/s
  data to 4x rate. (ie to 176.4kS/s or 192kS/s).
  Data received at higher than 48kS/s is not filtered: it
  is processes bit-perfect. When either filter is active,
  the display LED will be magenta while music is playing.
  Learn more about Resonessence custom filters.

IN USB DAC and USB SPDIF Bridge mode:

• Pressing the pause/play button pauses and plays by sending
  commands to the music player application.
• Pressing left/right scrolls in the application playlist.
• Pressing the UP/Down button enables or disables the Analog
  output and SPDIF output.

  * Initially both outputs are active.
  * Pressing the up button shuts off the SPDIF output.
  * Pressing the down button shuts off the Analog output

  The LED flashes briefly to indicate that the action has
  been taken. Upon reaching the top (Analog output only)
  or bottom (SPDIF output only) the LED no longer flashes,
  indicating that you have reached the setting.

USB DAC mode – Specifications
To use these two USB host modes, connect the USB of CONCERO to the USB
Host (use a High Speed USB port, not a Full Speed USB port). Connect your
analog input pre-amplifier to the analog output ports on CONCERO, – or –
connect your SPDIF input pre-amplfier to the SPDIF output on CONCERO.

Low Jitter Oscillators for Reference clocks. (No PLL’s)
Custom Async USB 2.0 up to 24bit 192kS/s (download Windows USB Audio 2.0 Driver)
Selectable ‘bit-perfect’ mode of operation, jitter removed, but identical data
Two selectable up-sampling filters: Minimum Phase IIR, and Apodizing
Apple Remote IR sensor for USB HID Control. (Play/Pause, Prev/Next track)
Data Lock indication with Blue LED illumination
28 bit Audio DAC processing
1.2Vrms output level to connect to pre-amplifier inputs
300 Ohm Output impedance
Less than 0.005% THD+N into 100k load
More than 104dB DNR
High Quality Film Caps for Audio Section
3 Dedicated regulators for Audio Section (2 in DAC chip, 1 on-board)

USB to SPDIF Bridge – Specifications
Connect to a USB Host as described in USB DAC mode (above)

Low Jitter Oscillators for Reference clocks . (No PLL’s)
Custom Async USB 2.0 up to 24bit 192kS/s (download Windows USB Audio 2.0 Driver)
Selectable ‘bit-perfect’ mode of operation, jitter removed, but identical data
Two selectable up-sampling filters: Minimum Phase IIR, and Apodizing
Apple Remote IR sensor for USB HID Control (Play/Pause, Prev/Next track)
Data Lock indication with BlueLED light up
Low jitter SPDIF output
Galvanic Isolated SPDIF output

SPDIF DAC – Specifications
Please note: External USB based Charger is needed for power supply. To use
this mode, connect the USB of of CONCERO to a power-only USB port. (Such
as are commonly used to charge cell phones). Because CONCERO will not find
an active USB Host on such a connection, it will switch to SPDIF DAC mode.
Connect your SPIDIF output from your digital music source to the SPDIF port on
CONCERO, connect your analog input pre-amplifier to the analog output ports
on CONCERO. Any SPDIF data received will then be output to the analog outputs.

Low Jitter Oscillators for Reference clocks (No PLL’s)
SPDIF Input with up to 24bit 192kS/s support
Selectable ‘bit-perfect’ mode of operation, jitter removed, but identical data
Two selectable up-sampling filters: Minimum Phase IIR, and Apodizing
Galvanic Isolated SPDIF Input
USB port is now the power supply, can use high end USB cable and “power-only” cable
28 bit Audio DAC processing
1.2Vrms output level to connect to pre-amplifier inputs
300 Ohm Output impedance
Less than 0.005% THD+N into 100k load
More than 104dB DNR
High Quality Film Caps for Audio Section
3 Dedicated regulators for Audio Section (2 in DAC, 1 on-board)