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’ mode. CONCERO and CONCERO HD
enable the ‘USB to SPDIF Bridge’ concurrently.
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.
The display LED will remain red until data begins to stream
from the USB host, at which point the LED turns blue.
SPDIF input mode may be selected while plugged into an
active USB port by pressing the “up button” two times.
- 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
* 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 up button again selects SPDIF as input.
* 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 (SPDIF input selected)
or bottom (SPDIF output only) the LED no longer flashes,
indicating that you have reached the setting.
CONCERO HP Configuration Tool
- Resonessence will provide a configuration tool on both
MS WIndows and MAC OS to allow a non-volatile setting
of the CONCERO HP for S/PDIF mode. Specifically, the
user will be able to configure the S/PDIF port as an output
that replicates the data received on the USB port (except
for DSD128 mode), or operates as an input for the DAC.
Low Jitter Oscillators for Reference clocks. (No PLL’s)
Custom Async USB 2.0 up to 24bit 384kS/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
High Quality Film Caps for Audio Section
3 Dedicated regulators for Audio Section (2 in DAC chip, 1 on-board)
USB DAC mode
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 and CONCERO HD,
- or – connect your SPDIF input pre-amplfier to the SPDIF output on CONCERO and
CONCERO HD. On CONCERO HP connect the Headphone to the output socket, (ensure
the volume level on your player application is not too high!)
HD and HP Models: DSD64 and DSD128 using DoP protocol version 1.1
Apple Remote IR sensor for USB HID Control. (Play/Pause, Prev/Next track)
Data Lock indication with Blue LED illumination
SPDIF DAC mode
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. Connect the headphones to the CONCERO HP.
Any SPDIF data received will then be output to the analog outputs.
SPDIF Input with up to 24bit 192kS/s support
Galvanic Isolated SPDIF Input
USB port is now the power supply, can use high end USB cable and “power-only” cable.
| ||CONCERO||CONCERO HD||CONCERO HP|| |
|Bit Width||24||24||24||Bits at Input*|
|Sample rate (max)||384||352.8||352.8||kS/s|
|Output Level||1.2||2||3.5 (at 0dB)||VRMS|
|THD+Noise||<0.005, 86||<0.001, 100||<0.001, 100||%,dB|
|Dynamic Range||>104||>112|| ||dB A-Weighted|
|Hum and Noise|| || ||<3.4||uV A-Weighted|
|Power 32 ohms|| || ||270, 91||mW, THD+N dB|
|Power 60 ohms|| || ||206, 94||mW, THD+N dB|
|Power 300 ohms|| || ||45, 102||mW, THD+N dB|
|Power 600 ohms|| || ||22.75, 102||mW, THD+N dB|
CONCERO and CONCERO HD can switch to S/PDIF input while in USB mode:
(Two up-presses on remote. See the user guide page 9 for details)
USB to S/PDIF Bridge
Connect to a USB Host as described in USB DAC mode (above).
Please note that the CONCERO HP can be configured to output S/PDIF
or accept S/PDIF as an input by a configuration tool on the PC or MAC.
(This feature is provided so that the CONCERO HP does not need to use
any remote control device.)
Low jitter SPDIF output
Galvanic Isolated SPDIF output
CONCERO HD passes DoP DSD64 packets to the S/PDIF output.
* Internally, the Sabre DAC chip uses at least a 32 bit data path (more in
certain places). Our products accept 24 bits at the input via, USB, S/D Card