Soekris Audio ApS
dac2541 Users Manual
www.soekris.dk
6
Nov 2020
Volume Knob:
The volume LED display indicates current volume, from -90 dB to +10 dB. The
volume knob is using a digital encoder to set the volume level digitally from -90 dB to +10 dB in
precise 1 dB steps. If you connect the Line Out to a system with a volume knob you might want to
set the dac2541 Line Out volume startup level to a fixed 0 dB, you can do that by selecting Line
Out, turning the volume up to -4 or higher, then store the startup setting by pressing and holding the
“FILTER” button for 4 seconds. The volume control is then inactive, it can be made active again by
holding the “FILTER” button for 4 seconds again.
“OUTPUT” button:
Selects where the audio signal will go, when the “LINE” LED is on it will go
to the Line Out on the RCA Phone sockets and the balanced XLR sockets, when the “PHONES”
LED is on it will go to Headphones Jacks on the front. The output not selected will be muted.
6.3 mm Jack:
is for connecting to a set of headphones, almost any type can be used, the loading
impedance should be minimum 16 ohm, high impedance types work very well. The dac2541 is able
to output minimum 6.5V RMS into 32 ohm or higher, in power that is 1300 mW into 32 ohm, 400
mW into 100 ohm or 140 mW into 300 ohm.
4 pins XLR socket:
is for connecting to a set of balanced headphones, almost any type can be
used, the loading impedance should be minimum 32 ohm, high impedance types work very well.
The dac2541 is able to output minimum 13V RMS into 50 ohm or higher, in power that is 3400
mW into 50 ohm, 1700 mW into 100 ohm, 560 mW into 300 ohm or 280 mW into 600 ohm. The 4
pins XLR socket pinout is the de facto standard as used by Sennheiser and others.
Remote Control:
The dac2541 have support for using a remote controller to adjust the volume
level and to select input source. The remote need to be an Apple 2
nd
generation remote or a
compatible one. The dac2541 as default will not be locked to a remote, but can be locked to a
specific remote using its device code. To lock the dac2541 to a remote, first press the “XFEED”
button for 4 seconds until the “CLIP” indicator lights, then press any button on the remote. If you
don’t press any button on the remote before the “CLIP” indicator goes off then the dac2541 will go
back to its default setting of not being locked to a specific remote. You then also need to store the
new remote setting by pressing the “FILTER” button for 4 seconds.
Firmware Upgrade:
The dac2541 support firmware upgrade via the USB interface, which have a
built in Serial Port function. The instructions are at
http://soekris.dk/update_dac1xxx.html
, but
ignore step 1 and step 4 as the dac2541 have the built in Serial Interface. You use the same USB
interface and cable you use for Audio.