Esoteric Clock G 25U User Manual

D00864900A  
G-25U  
Master Clock Generator/Up-converter  
Owner’s Manual  
 
Before Use  
What’s in the box  
Please confirm that the following accessories are in the box when you open it.  
Power cord x 1  
Felt x 3  
Warranty card x 1  
Owner's manual x 1  
Read this before operation  
As the unit may become warm during operation, always leave sufficient space around the unit for  
ventilation.  
The voltage supplied to the unit should match the voltage as printed on the rear panel. If you are  
in any doubt regarding this matter, consult an electrician.  
Choose the installation location of your unit carefully. Avoid placing it in direct sunlight or close to  
a source of heat. Also avoid locations subject to vibrations and excessive dust, heat, cold or  
moisture.  
Do not place the unit on the amplifier/receiver.  
Do not open the cabinet as this might result in damage to the circuitry or electrical shock. If a  
foreign object should get into the unit, contact your dealer or service company.  
When removing the power plug from the wall outlet, always pull directly on the plug, never yank  
the cord.  
To keep the laser pickup clean, do not touch it, and always close the disc tray.  
Do not attempt to clean the unit with chemical solvents as this might damage the finish. Use a  
clean, dry cloth.  
Keep this manual in a safe place for future reference.  
Before Use  
Placement of the unit  
High-quality hardened tool steel is used for the pin-point feet, securely attached to the bottom of the  
player. Although the cover feet may appear loose, the weight of the unit causes them to be firm and  
secure, and the design effectively damps and reduces vibration.  
Be careful to avoid injury when moving the unit, on account of its weight. Get someone to help  
you if necessary.  
To protect floors, etc. you may stick the felt supplied with the unit to the bottom of the cover  
feet.  
Screw  
nut  
Foot stand  
Ring  
nut  
CAUTION  
The product shall not be exposed to dripping or splashing and that no object filled with liquids, such as  
vases, shall be placed on the product. Do not install this equipment in a confined space such as a  
book case or similar unit.  
Maintenance  
If the surface of the unit gets dirty, wipe with a soft cloth or use diluted neutral cleaning liquid. Be sure to  
remove any fluid completely. Do not use thinner, benzine or alcohol as they may damage the surface of  
the unit.  
 
Connection  
CAUTION:  
Switch off the power to all equipment before making connections.  
Read the instructions of each component you intend to use with this unit.  
CD drive unit, etc.  
Balanced XLR  
pin assignment  
RCA coaxial  
digital cable  
BNC cable  
75Ω  
BNC cable  
75Ω  
BNC cable  
75Ω  
Supplied  
power cable  
Reference  
frequency  
signal output  
terminal  
Wall socket  
DIGITAL IN  
Connect either one:  
Optical digital cable  
XLR digital cable  
Rubidium master clock  
generator, etc.  
D/A converter, etc.  
RCA coaxial cable  
 
A. WORD CLOCK OUT terminals [WORD CLOCK OUT]  
These terminals output word synchronization signals. Connect these OUT terminals to the WORD  
SYNC IN terminals of the other digital devices (CD Transport, D/A converter, etc.), using a  
commercially-available BNC coaxial cable (impedance: 75Ω).  
The G-25U has three separate output systems (system A, B and C) which can separately output 1x,  
2x, and 4x multiples of the base frequency series (44.1 kHz, 48 kHz). Output system selection can be  
operated by the front panel A, B and C buttons.  
Each of these systems has two output ports, making it possible to supply word clocks to up to six  
devices. G-25U can synchronize several devices even though the base frequency of each device is  
different from each other (i.e. 88.2kHz CD transport + 176.4kHz D/A converter).  
B. External 10-MHz signal input port [EXT IN]  
Master clock signal from external devices (i.e. cesium master clock generator) can be input by  
connecting this EXT IN terminals to the output terminals of the external master clock generator, using  
a commercially-available BNC coaxial cable (impedance: 75Ω).  
Input frequency range: 10MHz, 44.1kHz, 88.2kHz, 196.4kHz, 48kHz, 96kHz, 192kHz  
C. Digital audio input terminals [DIGITAL IN]  
Connect these terminals to the digital output terminals of digital devices using a commercially  
available cable.  
RCA: Use RCA (pin) coaxial digital audio cable  
OPTICAL: Use optical digital audio cable (TOS)  
D. Digital audio output terminals [DIGITAL OUT]  
Digital audio is output from these terminals (XLR, RCA, OPTICAL). Connect these terminals to the  
digital input terminals of D/A converter using commercially available cables.  
XLR: Use balanced XLR digital audio cable  
COAXIAL: Use RCA (pin) digital audio cable  
OPTICAL: Use optical digital audio cable (TOS)  
XLR1(R) and XLR2(L) correspond to the Dual AES standard. When the D/A converter also  
corresponds to this standard, connect the L and R terminals of the player to the corresponding inputs  
of the D/A converter using two XLR cables, then press UP CONVERT button of the front panel to  
select DUAL position.  
The optical terminal is covered by a shutter. Make sure that the cable is firmly inserted, but do not  
force the cable when connecting it or removing it, in order not to cause damage to the unit.  
E. SIGNAL GND  
You may improve the sound quality by connecting this terminal to a corresponding earth terminal on  
the CD player using a commercially-available PVC-covered electric cord.  
(It is not a safety earth.)  
F. AC Power Cord  
After all other connections have been made, insert the AC power cord included with the player to  
the socket. Then insert the plug in the wall socket.  
Although this unit is equipped with 3-terminal power inlet, the ground pin does not connected to  
the chassis.  
Do not use any power cords other than the one included with the player to avoid fire, electric  
shock, etc. If you are not going to use the unit for some time, disconnect the power cord from the  
wall socket.  
 
Name of Each Control  
A. POWER  
Use this to turn up the unit on and off. When the unit is on, the ring surrounding the button lights up.  
B. Up converter Input select switch  
Use this switch to select the digital inputs. The indicator LED lights up according to the selected input  
lines.  
C. UP CONVERT button  
Use this switch to select the sampling frequency of up/down-conversion. The digital output signal is  
converted (44.1/88.2/176.4 or 48/96/192) according to the base frequency series (44.1kHz or 48kHz)  
selected by the MASTER button.  
D. MASTER button  
Use this switch to select the base frequency of the word clock signal / up-converted digital signal.  
48kHz  
At this position, the unit generates 48kHz base frequency signal by internal crystal clock generator.  
This is the generally used position for the unit like DVD player, DAT recorder, etc., which works with  
48kHz clock.  
44.1kHz  
At this position, the unit generates 44.1kHz base frequency signal by internal crystal clock. This is  
the generally used position for the unit like CD player, which works with 44.1kHz clock.  
Press MASTER button for more than 2 seconds to select the EXT mode on and off.  
EXT mode  
When you use reference clock signal from external devices connected to EXT IN terminal, turn on  
this mode. The indicator LED lights up when the EXT mode is on.  
Reference frequency automatically changes when the input signal from the EXT IN is different  
from the selected internal base frequency series.  
EXT indicator blinks when the EXT mode is on and the unit cannot detect the reference signal  
from external devices, or the input signal is beyond the spec this unit can input.  
When the EXT indicator is blinking, confirm the setting of the connected external devices. If you  
do not use EXT IN terminal, turn off the EXT mode.  
E. CLOCK GENERATOR frequency switchs  
Use these switches to select the output word clock signal frequency. This unit has three separate word  
clock signal output systems (A/B/C) which can separately output 1x/2x/4x of the frequency you  
selected by MASTER button. You can also turn off each system separately. When the system is off,  
indicator LED of the system turns off.  
When the MASTER (base frequency series) is  
44.1kHz: 44.1kHz, 88.2kHz, 176.4kHz  
48kHz: 48kHz, 96kHz, 192kHz  
 
Set Up #1  
Master clock function  
1. Connect WORD CLOCK OUT terminals to WORD SYNC IN terminals of each component  
you intend to use with this unit, using a commercially-available BNC coaxial cable.  
Read the instructions of each component to connect other audio signal line  
2. Turn on the power using the POWER button on the main unit.  
The ring surrounding the button and each indicator LED light up.  
3. Press MASTER button to select the base frequency.  
44.1kHz: for CD playback  
48kHz: for DVD playback  
4. Select lines by pressing A, B or C button, and select the frequency of the word clock signal.  
Select as high frequency as the connected components can accept.  
5. Turn on the power of each connected components, and set each component to work as the  
“slave” of G-25U.  
ESOTERIC components setting  
P-70/P-70(up-graded): turn on the front panel WORD SYNC switch, select the rear panel PLL  
filter switch to MODE2.  
P-0/P-0s: turn on the SYNC button on by using remote.  
P-0s(up-graded): turn on the rear panel WORD SYNC switch.  
D-70(up-graded): set the front panel CLOCK MODE switch to WORD+RAM, and set the word  
sync mode to IN M1 by using remote.  
UX-1: Press CLOCK MODE button to set the Word ON.  
X-01: Press CLOCK MODE button to set the Word M1 ON.  
NOTE: If you connect this unit to other manufacture’s components, read well the instruction of them to  
confirm the frequency range your unit can accept. You may have to set the clock frequency just as the  
same as audio signal frequency depending on components you use.  
Dual AES connection may need to set the clock frequency the half of the audio signal frequency.  
 
Set Up #1  
Up-convert function  
This unit can convert input signal from digital input terminals to up/down converted sampling frequency  
digital signals.  
1. Turn on the power using the POWER button on the main unit.  
Read the instructions of each component to connect other audio signal line  
2. Press INPUT to select the line which digital component is connected.  
3. Press UP CONVERT button to select the output sampling frequency.  
44.1/48  
88.2/96  
176.4/192  
88.2/96 DUAL  
176.4/192 DUAL  
88.2kHz (96kHz) signals are sent out of each XLR terminal when you select 176.4/192 DUAL (4  
times up mode).  
44.1(48kHz) signals are sent out of each XLR terminal when you select 88.2/96 DUAL (2 times up  
mode).  
Connect XLR (R) terminal of this unit to XLR (R) in terminal of the D/A converter, and XLR (L)  
terminal to XLR (L) in terminal, using two commercially-available XLR coaxial cable.  
There is no digital signal output from RCA or OPTICAL terminals when you select 176.4/192 DUAL  
or 88.2/96 DUAL.  
When the unit is not DUAL mode ( DUAL indicator is turn off), each terminal separately output stereo  
signal.  
The compatibility to up converted sampling frequency is different between components you intended  
to use. Read well the instruction of each component.  
When the MASTER button is 44.1, the output signal frequency is 44.1kHz, 88.2kHz or 176.4kHz.  
When the MASTER button is 48, the output signal frequency is 48kHz, 96kHz or 192kHz. When the  
unit is EXT mode, the sampling frequency depends on input clock signal.  
This unit can up-convert linier PCM signal only. Dolby Digital , DTS or other format signal cannot be  
up-converted. When these signal format is input, there are occasions where the sound is muted or  
become noisy.  
When you playback HDCD, connect the D/A converter directly to the HDCD playback device  
because D/A converter does not read signal as HDCD format when the signal passes through this  
unit.  
 
Troubleshooting  
No power.  
Check the connection to the AC wall outlet. Make sure the outlet is not switched by a lamp switch by  
plugging in another electrical device to see if the outlet is “live”.  
Press the POWER switch of the unit to turn it on.  
Word sync does not work.  
Frequency of the output word clock may be invalid to the connected components. Change the frequency  
setting to match that of each component. There are occasions where the word sync setting of each  
component can be changed by tying other connection or setting, read well the instructions of each  
component.  
Cannot select suitable frequency by pressing A, B or C buttons.  
Press MASTER button to select the base frequency before selecting frequency by pressing A, B or C  
buttons.  
Sound is strange.  
Check the setting and suitable frequency range of connected components. If the setting is not correct,  
there are occasions where the reproduced sound is strange or contains excessive noise.  
EXT indicator LED blinks.  
EXT indicator blinks when the EXT mode is on and the unit cannot detect the reference signal from  
external devices, or the input signal is beyond the spec this unit can input.  
When the EXT indicator is blinking, confirm the setting of the connected external devices. If you do not  
use EXT IN terminal, turn off the EXT mode.  
Specifications  
General  
Power supply  
Europe model . . . . . . . . . . . . . . . . . . ..AC 230 V, 50 Hz  
U.S.A./Canada model. . . . . . . . . . . . . . . AC 120 V, 60 Hz  
Power consumption . . . . . . . . . . . . . . . . . . . . . . . . 9W  
Weight . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7.9kg  
External dimensions (W x H x D) . . . . . . . 440 x 95.5 x 342 mm  
Word Synchronization output format  
44.1kHz series....................................... 44.1kHz, 88.2kHz, 176.4kHz  
48kHz series....................................... 48kHz, 96kHz, 192kHz.  
Output...................... .........................BNC x 3 /TTL rectangular wave /75Ω  
Accuracy...................... .........................±1ppm  
Word synchronization input frequency range  
44.1kHz, 48kHz, 88.2kHz, 96kHz, 176.4kHz, 192kHz. 10MHz (±10ppm)  
1.45Vp-p sine wave / rectangular wave  
External Input jack...................... ..BNC x 1 /75Ω  
Digital inputs  
RCA x 2  
TOS x 1  
input format...................... ..S/PDIF format  
Sampling frequencies (kHz)  
32, 44.1, 48, 88.2, 96, 176.4, 192 (kHz)  
Digital outputs  
XLR x 2 (2 single or 1 AES3 DUAL)  
RCA x 1  
TOS x 1  
Output format...................... ..S/PDIF format, AES3 DUAL format  
Accessories  
Power cord x 1, Felt x 3, Warranty card x 1, Owner's manual x 1  
Improvements may result in specification or feature changes  
without notice.  
 

Earthquake Sound Speaker SuperNova MKV User Manual
Eiki Projector 3990BPA User Manual
Estate Range W10173755D User Manual
Eton Power Supply FR370 User Manual
Extron electronic Network Card DDRX DVI User Manual
Extron electronic Stereo System TP Receivers User Manual
GE Food Warmer JKD910 User Manual
GE Freezer FUM13 User Manual
Gemini Industries Automobile Parts FT 160 User Manual
GE Oven PSB1000 User Manual