CORE AUDIO KARUNA P24 User manual

CORE AUDIO KARUNA P24 USB/SPDIF converter, reclocker
Core Audio Kft. – Hungary All rights reserved. 19.05.2021.
www.coreaudio.eu
CORE AUDIO
KARUNA P24 USB/SPDIF converter, reclocker
USERS MANUAL

CORE AUDIO KARUNA P24 USB/SPDIF converter, reclocker
Core Audio Kft. – Hungary All rights reserved. 19.05.2021.
www.coreaudio.eu
CONTENT
1. Introduction
2. Product Description
3. Content of the package
4. Technical specifications
5. Installation guide – Driver
6. Connecting the device
7. Warranty terms and conditions
8. Troubleshooting
9. Electrical standard requirements

CORE AUDIO KARUNA P24 USB/SPDIF converter, reclocker
Core Audio Kft. – Hungary All rights reserved. 19.05.2021.
www.coreaudio.eu
1. INTRODUCTION
The development of products by Core Audio Kft. started almost 10 years ago. Our company
started it’s mission by perfecting the PC based audio playing. Our technicians and engineers in
charge of the development discovered that a basic problem is that, in order to get the
expanding of the bandwidth of the source through the sound reproduction chain to the listeer,
you have to make sure that the equipment connected the source are also ready to receive the
increased level of information. When creating this product our goal was to create an ideal
interface to make sure that the mass of digital signals arriving from the source are transferred
to the digital-analog converter by our USB/SPDIF transformer with minimal loss of information
or transformation. We believe our goals set when creating the products were necessary
because the digital signal can only disconnect from the USB port and travel through a coax or
AES/EBU connector towards the digital-analog converter when the audiophil ways are
completely fulfilled.
This product was tested and developed by the Core Audio Co. Ltd. for many years and many
costumers use it satisfied in their systems to this day. Our developments due to the latest
technical inventions didn’t stop and won’t stop; we try to keep our product up to date and on
the highest standard. The current product contains the 4th generation converting panel.
It is really important for us and we really appreciate that you choose our product and that you
put your trust in us. It ensures us that we are on the right track developing our products.
Thank you for trusting us!
the Core Audio team

CORE AUDIO KARUNA P24 USB/SPDIF converter, reclocker
Core Audio Kft. – Hungary All rights reserved. 19.05.2021.
www.coreaudio.eu
2. PRODUCT DESCRIPTION
When we were creating the product our base was the USB/SPIDF converting (bridge) panel.
This panel includes the necessary components that make the quality digital data transmitting
possible. We based the whole product around this panel with the right sizing.
The whole equipment is made with vibration absorbing parts. It starts at the bottom of the
case where 4 silicone pads are absorbing all the vibration from the case. A case of an
equipment in the modern era should not only take part in vibration absorbtion but also in
leading the heat off generated during the operation of the different parts of the equipment.
The elimination of any vibration started at transformer, it is triple shielded and 4 antivibration
damp helps to eliminate the vibrations from the transformer side to the other parts.
The equipment operates with 230V/50Hz input voltage and it’s power supply is completely
separated for all stages with a ultra low-noise analog, linear power circuit (the KARUNA P24
built with 3 circuits linear PSU). We use short and optimized PCB conduction bands. For the
external power we use a high quality standard Furutech IEC socket with changeable fuse.
The standard inside cabling is done with cables containing UP-OCC solid copper wires on DC
side and special clock cables on clock signal path.
On the main panel, among other, the followings are placed: the clock signals connecting points
the XMOS chip, the clock signal needed for operating the standard clock signals of 44.1KHz
and 48KHz (and it’s multiplied versions such as 88.2 kHz, 176.4 kHz, 96 kHz, 192 kHz), and a
different one (24 MHz) for operating the USB port. All clock signals comes from own developed
Core Audio Kft.’s special OCXO (reference 10MHz clock module) PLL controlled masterclock
panel. Thanks to the MasterClock panel, all clock signal what necessary to the USB/SPDIF
board running on the same clock signal, with ultra low jitter and phase noise. No matter the
level or stage, there are extremely short signal pathways using high quality, low heat-
dependent parts.
The central control panel contains the most recent XMOS XU216 16 multicore microcontroller,
guaranteeing that the high definition contents sent through the signal pathway. To ensure the
optimal operation we had to modify the original XMOS chip as well, so we diverged from the

CORE AUDIO KARUNA P24 USB/SPDIF converter, reclocker
Core Audio Kft. – Hungary All rights reserved. 19.05.2021.
www.coreaudio.eu
reference XMOS design when creating the product, it operates in different principles than the
original.
Front and top of the device:
On the front panel of the device there is the On/off switch with a LED indicator. To turn the
converter on you have to press the button until it clicks. When it is on the LED indicator will
glow in a blue circle.
Back panel:
POWER ON/OFF
230V/AC/50Hz
USB 2.0 – B-type IN
AES/EBU OUT, S/PDIF OUT
24MHz clockOUT

CORE AUDIO KARUNA P24 USB/SPDIF converter, reclocker
Core Audio Kft. – Hungary All rights reserved. 19.05.2021.
www.coreaudio.eu
On the back panel you can find the following ports:
- IEC socket: the standard 15 A power supply cord has to be connected here
A colored dot shows the correct polarity.
- USB in: suitable to connect a standard USB 2.0 “B”cable, the device will receive the
signal coming from the source through this cable.
- AES/EBU-XLR output: symmetric output suitable to connect 110 ohm cable
- S/PDIF-RCA output: output suitable for connecting 75 ohm cable
- 24MHz Clock OUT miniXLR sockets: the equipment can connect to Core Audio’s USB
P24 Card and DENPO P24 digital-to-analog converter, and add the necessary clock
signal to that equipment to the PLL loop between equipments
3. CONTENT OF THE PACKAGE
a., Core Audio KARUNA P24 USB/SPDIF converter and reclocker in silver or black color
b., User Manual
c., XMOS driver (USB 2.0), can download from www.coreaudio.eu product’s page
d., Travel box

CORE AUDIO KARUNA P24 USB/SPDIF converter, reclocker
Core Audio Kft. – Hungary All rights reserved. 19.05.2021.
www.coreaudio.eu
4. TECHNICAL SPECIFICATIONS
General product specifications
Brushed CNC milled aluminum case on silicon pads
3 circuits ultra low noise linear PSU (under 20uV), passive cooling
1pc triple shielded transformer with antivibration dampings
The use of SMD panel technique
Core Audio MasterClock module with 10MHz OCXO, PLL controlled 3pcs own developed clocks (ultra
low jitter and phase noise)
UP-OCC solid copper inside cabling
2pcs 24MHz Clock output for other P24 Serie equipment
General Technical Specifications
Voltage
220-240 V (50Hz)
Power consumption
max. 10 W
Digital Outputs
AES/EBU-XLR, S/PDIF-RCA
Digital Inputs
USB 2.0 (type B)
Clock signals ( 3 )
1db (44,1 kHz, 48 kHz), 1db (USB), 1db (XMOS) CRYSTEK
Supported resolutions
USB:
16bit / 44,1 - 48 kHz
24bit / 44,1 - 48 - 88,2 - 96 - 176,4 - 192 kHz
Managing .dsd, .dsf content
The device is equipped with the latest xCORE XU216 modified
chip, it takes part in converting dsf and dsd files
to PCM 24bit / 96kHz resolution or
to PCM 24bit / 192kHz resolution
Handle foo_dsd_asio and Kernel Streaming
Weight
3,8 kg (netto)
Dimensions:
272 x 212 x 60 mm
Optimal operation
temperature
+18 ∘C - +35 ∘C
Software support
Windows 10, MacOS, Linux Plug&Play supported
XMOS installing driver downloadable from Core Audio’s webpage

CORE AUDIO KARUNA P24 USB/SPDIF converter, reclocker
Core Audio Kft. – Hungary All rights reserved. 19.05.2021.
www.coreaudio.eu
5. INSTALLATION GUIDE - DRIVER
Only use the device if you already installed the proper driver on your computer before the first
use. (On the included pendrive, or on our webpage at the product’s page you can download
the latest drivers)
Although the latest versions of Windows 10 Home, MacOS 10.13, Linux distributions already
contain the necessary XMOS drivers to connect the USB, we recommend that you use the
device with the driver provided by us, that way we can guarantee the problem free operation
of the device.
IMPORTANT: when starting the installation do not have the device and the source connected
with a USB cable and close all other applications !
a., First step: copy the installing file from the pendrive or downloaded from the webpage
(XMOS-Stereo-USB-Audio-Class2-Driver-2023_v3.34.0.exe) to a folder selected by you.
b., Double click on the installing file
c., The following window will appear after starting the installation:

CORE AUDIO KARUNA P24 USB/SPDIF converter, reclocker
Core Audio Kft. – Hungary All rights reserved. 19.05.2021.
www.coreaudio.eu
d., Accept Terms and Conditions, tick the square and click Next
e., Selecting the Installation folder:

CORE AUDIO KARUNA P24 USB/SPDIF converter, reclocker
Core Audio Kft. – Hungary All rights reserved. 19.05.2021.
www.coreaudio.eu
f., Finish Installation:

CORE AUDIO KARUNA P24 USB/SPDIF converter, reclocker
Core Audio Kft. – Hungary All rights reserved. 19.05.2021.
www.coreaudio.eu
g., Close Installing Wizard:
h., At the Settings menu of the media-player applications you can choose what audio device
you want to use. Since the USB cable is not connected yet there won’t be any changes:

CORE AUDIO KARUNA P24 USB/SPDIF converter, reclocker
Core Audio Kft. – Hungary All rights reserved. 19.05.2021.
www.coreaudio.eu
i., Connect the USB cable from the source to the device and turn it on. The following text will
pop up in the bottom right corner of the screen:
j., At this point you can select „xCore USB Audio 2.0 (Kernel Streaming) in the Settings of the
Media-player application. The device is ready to use.

CORE AUDIO KARUNA P24 USB/SPDIF converter, reclocker
Core Audio Kft. – Hungary All rights reserved. 19.05.2021.
www.coreaudio.eu
6. CONNECTING THE DEVICE:
Only turn on the device with the „on” button when you already connected the
necessary cables (power cord, USB Input, AES/EBU, SPIDF, i2S output) to the right
input or outputs of all devices.
The maximum lenght of the USB cable cannot exceed 3 meters! We recommend a
cable between 1 and 2 meters. With the AES/EBU and SPDIF cables we recommend
maximum 3 meters.
Never use cables with damaged cover or damaged plugs or with faulty connections
Proper order of turning on equipments:
o KARUNA USB/SPIDF converter and reclocker
o Source device
o Digital/analog converter
o Active speakers or amplifiers
The turning on of the USB/SPIDF converter should ALWAYS be performed before
the turning on of the source device - otherwise the source device might not
recognize the converter or it’s operation system might crash.
Never unplug the device from the source or the DAC during playing because the
device can be physically damaged
Wrecking or taking off the cover of the device while it is connected to electricity is
Forbidden and can result in death.

CORE AUDIO KARUNA P24 USB/SPDIF converter, reclocker
Core Audio Kft. – Hungary All rights reserved. 19.05.2021.
www.coreaudio.eu
We recommend continuous operation of this device for a maximum of 5 hours- in
order to conserve the lifespan of the built in clock signal generators.
Optimal cable connections:
Symmetric connection: with AES/EBU XLR cables
Digital coax connection: with S/PDIF RCA connecting cables
Source device with
USB output
DAC
USB
OUT
USB
IN
AES/EBU
OUT
AES/EBU
IN
DAC
USB
OUT
USB
IN
S/PDIF
OUT
S/PDIF
IN
KARUNA
P24
USB
cable
AES/EBU
cable
KARUNA
P24
Source device with
USB output

CORE AUDIO KARUNA P24 USB/SPDIF converter, reclocker
Core Audio Kft. – Hungary All rights reserved. 19.05.2021.
www.coreaudio.eu
Clock signal cables connection method:
a., Music Server assembled with Core Audio USB P24 card: need to connect the USB
card’s miniXLR clockIN socket to the KARUNA P24’s miniXLR 24 MHz clockOUT socket.
(the 2pcs 24 MHz clockOUT port on KARUNA P24 is equal). The right clockcable is
assembled with miniXLR (mother) – miniXLR (father).
b., Music Server assembled with Core Audio USB P24 card + DENPO P24 DAC:
KARUNA P24 will work as Masterclock for Music Server and DENPO P24 Digital-to-
analog converter, all equipment will run on the same clock signal with PLL.
Music Server with
P24 USB card
DAC
KARUNA
P24
USB
output
AES/EBU
input
DENPO P24 DAC
KARUNA
P24
USB
kimenet
S/PDIF
bemenet
24MHz
clockIN
Forráskészülék
P24 USB kártyával
24MHz
clockIN
24MHz
clockIN
24MHz
clockOUT
24MHz
clockOUT
Same clock signal
Same clock signal

CORE AUDIO KARUNA P24 USB/SPDIF converter, reclocker
Core Audio Kft. – Hungary All rights reserved. 19.05.2021.
www.coreaudio.eu
7. WARRANTY TERMS AND CONDITIONS:
Core Audio Kft. provides a warranty for all the products made or sold by them from the
day of the purchase according the EU regulations.
The warranty only applies if the defect appeared during the proper use of the product.
The panel, the case and the power supply contains marked parts which indicate if the cover of
the device was moved or damaged. If during the time of the warranty the cover of the device
was opened or components are changed, any modifications are made and it results in a change
compared to the original state of the device the warranty is immediately terminated. The Core
Audio Kft. company will refuse to repair it, take it back or switch it to a new one.
The Core Audio Kft. will not take responsibility for any defects or damage resulting from
accident, falling, dropping it or during transportation.
If the repair takes over 4 weeks and it is included in the Core Audio Kft. will provide you with
a substitute one for the costumer. The costumer must take care of the substitute device, any
damage done to it must be paid for by the costumer.
8. TROUBLESHOOTING:
a., The device won’t turn on after turning it on
Check if the power cord is connected to 230V connector on the back of the device and if the
cable is connected also on the other end to the plug correctly. If using an adapter check if it is
turned on.
It is also possible that you didn’t press the On button right and it jumped back to it’s natural
position. If turned on right there will be white LED lightning around the power button.

CORE AUDIO KARUNA P24 USB/SPDIF converter, reclocker
Core Audio Kft. – Hungary All rights reserved. 19.05.2021.
www.coreaudio.eu
b., It won’t connect to the source or MusicServer
Check the USB cable if it’s working fine. (it’s not broken, doesn’t have any damage on it,
plugs are intact.) check if the cables are plugged in correctly and to the correct in and
outputs. Check if the USB/SPIDF converter is connected to electricity and is turned on.
Check if the latest installation driver is installed on your source device and if you have the
xCORE USB 2.0 Audio set as your primary audio device.
c., Device doesn’t connect to DAC
Check if USB/SPIDF device is connected to electricity and is turned on. Check the DAC if it is
connected to electricity and is turned on.
Check if S/PDIF is cable if it’s working fine. (it’s not broken, doesn’t have any damage on it,
plugs are intact.)
Check if both of the ends of the S/PDIF cable are correctly connected to their places and
make sure if the directions are correct.
If you use AES/EBU cable make sure if it’s working fine. (it’s not broken, doesn’t have any
damage on it, plugs are intact.)
If you couldn’t find a solution after checking the ones above please contact Core Audio Kft.
service on the product support part of the www.coreaudio.eu web page.

CORE AUDIO KARUNA P24 USB/SPDIF converter, reclocker
Core Audio Kft. – Hungary All rights reserved. 19.05.2021.
www.coreaudio.eu
9. FITTING THE ELECTRICAL STANDARDS
Core Audio Kft. as the manufacturer of this product declares that
KARUNA P24 USB/SPDIF converter and reclocker
product meets the requirements of the following standards:
MSZ EN 55014-1 (2017) – CISPR 14-1:2016
MSZ EN 55014-2 (2012) - CISPR 14-2:2016
MSZ EN 55020 (2004) – CISPR:2002
MSZ EN 55024 (2011) – CISPR 24:2010
IEC 61000-3-2 (2014)
IEC 61000-3-3 (2013)
Harmonized with # 2006/95/EC Directive (12.12.2006)
19.05. 2021. Budapest
..............................................
managing director
Core Audio Co. Ltd.

CORE AUDIO KARUNA P24 USB/SPDIF converter, reclocker
Core Audio Kft. – Hungary All rights reserved. 19.05.2021.
www.coreaudio.eu