Grimm Audio CC2 Manual de usuario
Please read this manual before operating the
unit.
Longing for detail, naturalness and imaging in digital?
Your system needs a reliable conductor.
CC2: the aordable clock you can’t aord to miss.
Please read this manual before operating the unit.
Manual CC2 © Grimm Audio
2
Table of Contents
1. Introduction 3
2. Important Safety Instructions 4
3. Installing 6
4. Signal Connections 8
5. Operation 9
6. Jitter Explained 11
7. Specications 14
8. Grimm Audio Limited Warranty 15
Table of Contents
Manual CC2 © Grimm Audio 3
1. Introduction
Thank you for selecting the Grimm Audio CC2 Central
Clock for your production environment. This product
features an ultra low jitter clock oscillator with 2 word
clock outputs. It embodies our company philosophy of
providing the most transparent signal chain possible,
enabling you to achieve the best possible results
sonically and artistically. Large parts of the CC2 circuitry,
like the oscillator and its power supplies, use a discrete
design. Because of this, a CC2 has more than 200
components. After assembly, extensive tests and an
individual jitter measurement are carried out.
The CC2 can be used in a wide variety of applications
such as:
• House Sync generation in audio studios. Two
outputs oer enough exibility for most modern
setups. The extremely low jitter of the CC2 clock
outputs maximises the sound recording and
playback quality potential of the devices connected.
• Clock stability improvement, and hence improved
sound, of digital live audio systems. By slaving your
main stage box to a CC2, the system sound quality
will likely improve.
• Improvement of your home audio system with word
clock equipped devices.
This manual describes how to set up the CC2 in your
studio, live sound or home environment as well as
important tips on how to get the best performance from
the CC2. In addition, some background information on
the unit’s operation is provided.
We hope this investment will bring you many years of
creative enjoyment and help you achieve your goals.
1. Introduction
Manual CC2 © Grimm Audio
4
2. Important Safety Instructions
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vertaling toe.
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völlig verstehen. Wenn notwendig, nehmen Sie bitte Kontakt
auf mit Grimm Audio. Auf Wünsch wird Ihnen eine
Übersetzung zugeschickt.
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parfaitement le texte en Anglais ci-dessous. En cas de doute
s.v.p. contacter Grimm Audio. Si necessaire, on pourra vous
envoyer une traduction.
Grimm Audio da por supuesto que el texto en versión
Inglesa no ofrece ninguna duda de interpretación y se
entiende integramente. Si este no fuese su caso rogamos
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Please follow these precautions when using
this product:
1. Read these instructions.
2. Keep these instructions.
3. Heed all warnings.
4. Follow all instructions.
5. Dangerous voltage is inside this apparatus. Opening
is only allowed by qualied service personnel.
6. Verify line voltage before use.
7. Do not defeat the safety purpose of the polarized or
grounding-type plug. A polarized plug has two
blades with one wider than the other. A grounding-
type plug has two blades and a third grounding
prong. The wide blade or the third prong are
provided for your safety. When the provided plug
2. Important Safety Instructions
Manual CC2 © Grimm Audio 5
does not t into your outlet, consult an electrician
for replacement of the obsolete outlet.
8. Protect the power cord from being walked on or
pinched, particularly at plugs, convenience
receptables, and the point where they exit from the
apparatus.
9. Unplug this apparatus during lightning storms or
when unused for long periods of time.
10. Do not use this apparatus near water.
11. Do not use this apparatus outside.
12. Do not expose the apparatus to dripping or
splashing. Do not place objects lled with liquids
(ower vases, drink cans, coee cups, etc) on the
apparatus.
13. Clean only with a dry, soft, non-uy cloth. Do not
spray any liquid cleaner onto the cabinet, as this
may lead to dangerous shocks. Do not spray any
liquid cleaner onto the faceplate, as this may
damage the front panel.
14. Install in accordance with the manufacturer’s
instructions.
15. Do not install near any heat sources such as
radiators, heat registers, stoves, or other apparatus
(including ampliers) that produce heat. Avoid
exposure to direct sunlight.
16. Use only attachments or accessories specied by
the manufacturer.
17. Use only with a cart, stand, bracket, or table
designed for use with professional audio or music
equipment. In any installation, make sure that injury
or damage will not result from cables pulling on the
apparatus and its mounting. If a cart is used, use
precaution when moving the cart/apparatus
combination to avoid injury from tip-over.
2. Important Safety Instructions
Manual CC2 © Grimm Audio
6
18. This unit runs slightly warm when operated
normally. Operate in a normal ventilated area. If
this product will be installed in a rack, make certain
there is sucient air movement within the rack.
19. Refer all servicing to qualied service personnel.
Servicing is required when the apparatus has been
damaged in any way, such as when the power-
supply cord or plug is damaged, liquid has been
spilled or objects have fallen into the apparatus, the
apparatus has been exposed to rain or moisture,
does not operate normally, or has been dropped.
20. WARNING: To reduce the risk of re or electric
shock, do not expose this apparatus to rain or
moisture.
3. Installing
Unpacking and Inspection
Your CC2 was carefully packed at the factory and the
packaging it came in was designed to protect it from the
trials and tribulations of shipping. Keep the box and all
packing materials, so that in the unlikely event that you
need to return the CC2 for servicing, you can do so
safely.
Mounting the CC2
The CC2 is available in two versions:
• a small and compact unit for stand alone use.
• a standard rack unit with 19” front.
The CC2 does not produce strong RF elds nor is
susceptible to them. You can position it near other
digital gear such as computers and disk recorders
without worry. In general it is a good idea to keep some
3. Installing
Manual CC2 © Grimm Audio 7
distance between monitors (LCD and CRT) and audio
cables because of risk of induced low level noise due to
stray magnetic elds.
Grimm Audio products have a real wooden face plate
that provides a beautiful and vivid appearance. The CC2
front panel is made of Padouk. The panel is nished
with an environmentally friendly oil. To maintain the
outstanding looks, one is advised to take some
precautions:
• Do not place the CC2 in very dry environments.
• Do not use chemical or alcohol based cleaner on
the wood.
• Avoid exposure to direct sun light, since the padouk
wood is susceptible to discolor in UV light.
AC Power Hookup
The CC2 has a linear power supply that needs to be
factory set for your local line voltage (115V or 230V +/-
10%). Make sure to check the line voltage at the back
near the IEC cable entrance (‘wired for ... V’) and verify if
this complies with your local mains voltage. The CC2 is
shipped with a proper mains cable. Grimm Audio
cannot be held responsible for problems caused by
using the CC2 with improper AC wiring or voltage.
The CC2 does not have a power switch on the front
panel; a convenient way to power down the unit is to
use a power strip equipped with a switch or eventually
power it down with the mains switch at the back.
3. Installing
Manual CC2 © Grimm Audio
8
4. Signal Connections
Impedance
(75 Ohm or Lo-Z)
BNC Outputs
Grimm Audio | CC2
Central Clock Source
12
Handcrafted in the Netherlands
Serial # 12-0.001.xxx
WARNING
This apparatus
must be earthed
Wired for
230V
115V
Word Clock Out
75Ω
1 2
Impedance
low
CAUTION
Risk of
electric shock
Do not open
Mains power
connection
4. Signal Connections
Base rate
Multiplication factor
Manual CC2 © Grimm Audio 9
5. Operation
The CC2 is a high performance master clock, it has no
slave option. Switches on the front and back oer
adjustments to the needs of your system and project.
On the front
• The bottom (horizontal) toggle switch selects a 44.1
or 48 kHz base rate.
• The top (vertical) toggle switch has three positions
and sets the multiplication factor of the base rate to
1, 2 or 4.
These switches control both BNC outputs
simultaneously. LEDs on the front indicate the current
sample rate setting.
On the back
Two miiniature switches select between 75 Ohm or Low
output impedance per BNC output.
Output impedance
Word sync connections are usually 5V square waves
transmitted using 75 ohm (video) coax cables. Although
the word clock frequency itself is relatively low, the
transitions are steep. Taken as a whole, word sync is a
wideband signal, usually necessitating characteristic
termination at least at one end of the cable. Better still
is series termination on the transmit end and parallel
termination on the receiving end. This minimises
reections even when the cable impedance is not
exactly matched.
Double termination like this produces a 6dB loss,
resulting in an eective 2.7V signal. All Grimm Audio
products are designed to work in this manner.
Unfortunately there is no standard dened for word
sync connections. As a result, implementations vary
across various makes. Outputs may be series
terminated or low impedance, DC or AC coupled. Inputs
may be parallel terminated or high impedance. This
yields to 8 permutations, all of them encountered in the
eld. To make things worse, we have reports from
5. Operation
Manual CC2 © Grimm Audio
10
customers that in some cases devices do lock to a word
clock signal when terminated, but their sound quality is
improved when unterminated. So our advice is to
experiment with it yourself on your own device.
The output impedance of the CC2’s may need to be set
“low” in some cases. For instance, a parallel-terminated
input expecting a 4V input signal will only work with the
CC2’s output impedance set low. A fair number of
products were found to have parallel terminated input
but stop working around 2.5V which is why the CC2 puts
out a slightly higher-than-normal voltage in order to
allow correct operation in the factory preset mode.
Nevertheless, some equipment will only respond
correctly when the output impedance switch is set to
low.
Connection
The CC2 has two word clock outputs. Each device
connected to the CC2 should be set to slave to word
clock. The preferred system wiring is ‘star distribution’
where each output of the CC2 connects to one device.
Daisy chain connections using T-junctions should be
avoided where possible. The latter will most likely fail
because of the lack of standardisation of termination
impedance and signal levels. In case you need more
word clock outputs, consider to buy our CC1 clock
distributor, which has 16 outputs.
Use 75 ohm coaxial cables with a low transfer
impedance. Since word clock is an unbalanced
connection, noise currents generated by earth loops will
ow through the BNC cables and any series impedance
in the connection can cause interference. The CC2 has a
low-impedance reference plane at the rear, insuring that
it will never be aected by circulating currents. By all
means, never defeat the safety earth connection of any
device that is designed to have an earth connection.
Lifting grounds may produce a lethal shock hazard and
will likely lead to unwanted high currents through coax
shields.
5. Operation
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