Soekris dac1101 User manual

www.soekris.dk 1 March 2016
dac1101 Users Manual
Discrete R-2R USB DAC / HeadAmp

Soekris Engineering ApS dac1101 Users Manual
www.soekris.dk 2 March 2016
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Soekris Engineering ApS dac1101 Users Manual
www.soekris.dk 3 March 2016
Introduction
The Soekris dac1101 is a small R-2R DAC, with USB input and output to either the built in
headphonesamplifier on a front mounted 6.3mm Jack, or to line level output on rear mounted RCA
Phono connectors. The dac1101 is not just any regular DAC, the sound quality is the absolutebest
available, thanks to the ultra high end design with a discrete R-2R sign magnitude DAC using a
total of 224 small and very precise resistors, and a discrete headphonesamplifier with zero negative
feedback, delivering high power to almost any headphones. The dac1101 R-2R DAC circuit is fully
isolated from the noisy computer USB interface. It supportsinput signals on the USB interface up
to 24 bit / 384 Khz PCM audio, and up to DoP-128 (x2) and DSD-256 (x4) audio. It has a fully
digital volume control and four sets of digital anti-aliasing filters to fit any taste. The dac1101 is
designed and built in Denmark, using advanced surface mount technology and parts from only the
highest quality suppliers.
Quick Start
Plug in the supplied USB Cable to the dac1101 and connect it to your computer, plug in your
headphones, set the rear left switch to “PHONES”, set the rear right switch to “USB1”, select
“soekris dac1101” as output in your computer settings and start playing music. The default power
up settings for volume and anti-aliasing filters are stored in flash memory and can be changed, see
rear view description for details.
Specifications
THD @ -1db <0.01%
THD @ -60dB <0.04%
S/N Ratio 20 Khz Bandwidth >118 dB
Frequency Range @ 44.1 Khz PCM 20hz -20Khz, +0.1dB -1.0dB
Frequency Range @ 384 Khz PCM 20hz -80Khz, +0.1dB -1.0dB
USB Input Type B, Fully Isolated, Full or High Speed
USB Input Mode Selectable Audio Class 1.0 or Audio Class 2.0
USB Input PCM Up to 24 Bit / 384 Khz
USB Input DSD Up to DoP-128 (x2) and DSD-256 (x4)
Digital volume control -80 dB to +10 dB
Output Line RCA Phono, 2.0V RMS, Zout 50R
Output Headphones6.3mm Jack, 3.5V RMS into min. 16 ohm, Zout 3 ohm
Power Consumptation From USB max 3.5W
Size 108 x 160 x 20 mm
Weight 0.3 Kg
Warranty 3 Years

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Dac1101 front view
The LED’s indicates input sample rate, volume level and anti-aliasing filtersselected.
When input is Linear PCM audio When input is DSD or DoP audio
PCM 44 Khz “44” LED on DoP/DSD-64 “DSD” on
PCM 48 Khz “48” LED on DoP/DSD-128 “DSD” and “X2” on
PCM 88/96 Khz “X2” LED on DoP/DSD-256 “DSD” and “X4” on
PCM 176/192 Khz “X4” LED on
PCM 352/384 Khz “X8” LED on
“FILT” LED color shows the current anti-aliasing filter selected
Red Linear Phase filter, also called brickwall filter
Orange Mix between Linear and Minimum Phase filter
Green Minimum Phase filter, also called butterworth filter
Off Soft Minimum Phase filter, a soft butterworth filter
The “VOL” LED indicates current volume, from off when at -80 dB to full on when +10 dB. The
volume knob is using a digital encoder to set the volume from -80 dB to +10 dB in 1 dB steps.
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 dac1101 is able
to output minimum 3.5V RMS into 32 ohm or higher, in power that is 400 mW into 32 ohm, 120
mW into 100 ohm or 40 mW into 300 ohm.

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Dac1101 rear view
The two RCA Phone sockets are for line out signal, the white one marked “L” is for the left
channel, the red one marked “R” is for the right channel.
There are three switches for various functions.
Left switch: Selects where the audio will go, when up or “LINE” it will go to the Line Out on the
RCA Phone sockets, when down or “PHONES” it will go to HeadphonesJack.The output not
selected will be muted.
Middle switch: Push to select between the four sets of anti-aliasing filters, hold for minimum four
seconds to store the current volume level and anti-aliasing filter selection, one setting for Line Out
and one setting for HeadphonesOut, the filter setting is common for both.
Right switch: Select between USB Audio Mode 1 and USB Audio Mode 2. The Windows
Operating System for some reason still doesn’t have direct support for USB Audio Mode 2 but
requiresdrivers. If you don’t want to load the drivers, or just want to do some testing, set the
dac1101 to USB Audio Mode 1 and the DAC should work on any Windows System without
drivers, but it will be limited to no more than 96 Khz PCM sample rate. To use higher than 96 Khz
sample rate or to use DoP or DSD, you need to set the switch to USB Audio Mode 2 and install the
Windows drivers for the dac1101.
USB type B socket: For connection to the USB interface on yourcomputer or other audio source
device. Please notethat the dac1101 is a relatively high USB load, so you need to use a high quality
high current USB cable, like the USB cable included with the dac1101. Please also note that the
dac1101 is actually able to draw a little higher current than USB 1.1 or 2.0 can deliver according to
the USB specifications. If you experience any issue when playing loud into low impedance
headphones you should try a different USB port or connect to a USB 3.xport as USB 3.x can
deliver higher current.
Windows Drivers: For using USB Audio Mode 2 are available for downloading on
http://www.soekris.dk/download.html. Please note that most newer versions of Apple OS X or
Linux don’t require drivers but will support USB Audio Mode 2 directly, see manual for your
operating systems as needed.

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Conformity Declarations
This equipment has been tested and found to comply with the limits for a Class B digital
device, pursuant to Part 15 of the FCC rules. These limits are designed to provide
reasonable protection against harmful interference in a residential installation. This
equipment generates, uses and can radiate radio frequency energy and, if not installed and used in
accordance with the instructions, may cause harmful interference to radio communications.
However, there is no guarantee that the interference will not occur in a particular installation. If this
equipment does cause harmful interference to radio or television reception, which can be
determined by turning the equipment off and on, the user is encouraged to try to correct the
interference by one or more of the following measures:
-Reorient or relocate the receiving antenna.
-Increase the separation between the equipment and receiver.
-Connect the equipment into an outlet on a circuit different from that of the receiver.
-Consult the dealer or an experienced radio/TV technician for help.
In order to maintain compliance with FCC regulations shielded cables must be used with this
equipment. Operation with non-approved equipment or unshielded cables is likely to result in
interference to radio & television reception.
Application for Council Directives 2011/65/EU, 2014/30/EU
Conformity declared for EN55022 Class B, EN55024
This marking indicates that this product should not be disposed with other household
waste throughout the EU. To prevent possible harm to the environment or human health
from uncontrolled waste disposal and to conserve material resources, this product
should be recycled responsibly. To dispose of your product, please use your local return
and collection systems.
Contact Information
Soekris Engineering ApS
Servicevej 6
DK-4220 Korsør
Denmark
http://www.soekris.dk
[email protected]