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Installing LClock XO in separate D/A Converters.
The purpose of this page, is to give You an impression of the method involved, for an optimized
installation of LClock XO
on separate Transport - D/A Converter setups.
The Installation procedure is a bit more complicated, than is the case, with integrated CD players, but
the result pays off
with an astonishing improvement in sound quality.
Click!
The LClock unit must be installed in the D/A Converter rather than the transport. This is because only
the DAC is
sensitive to jitter, and therefore must have a minimum of signal path to preserve the jitter free clock
signal from
LClock XO. But to make the transport synchronized with the DAC operation, a second wire between the
transport and the
DAC must be installed, to convey the sync signal of the LClock Master Clock signal.
The extra synchronization cable is installed by the user, by drilling a hole in each unit, and mounting a
quality
RCA receptacle. Then the clock signals are connected, via appropriate impedance matching resistors, to
the
plugs, and an extra phono cable is used to connect the sync signal.
Theory of operation.
The usual COAX cable normally transfers both data and clock signals mixed together in one package. The
receiver chip
then decodes and separates the data from the clock signal. The recovered clock signal would, in non
synchronized setups,
tend to have vast amounts of jitter, degrading the perspective and depth of the sound picture.
After the installation of LClock Sync link, the COAX cable now only has to be able to transport the data
signal, and
this is a quite easy job for most cables. The Clock recovered from the transport is not used at all in
the DAC. This
also means that the quality of the COAX cable is non critical. In fact most normal (screened) audio
cables will do
fine. Even a normal 75 Ohm antenna cable type will give optimal performance in the sync'ed connectivity.
The benefits of the Sync Master Clock is recognized in any professional Sound Studio where a central
'House Clock'
synchronizes all digital units with the D/A Converters, without the risk of jitter.
Important! To make the Sync connectivity work You must ensure the transport and D/A
Converter run
on the same frequency. If not the sync link is impossible to implement. In this case it is recommended
You find an
alternative transport or D/A Converter that will fit together with the unit You best like to keep in Your
system.
Once the Sync connection is implemented, none of the two appliances will run separately without the other
unit.
The D/A converter internal frequency is determined by the digital receiver chip.
Generally there are four different receiver chips on the market, running at distinct frequencies:
Yamaha YM3623 runs on 16,9344 MHz.
Crystal CS8412 runs on 11,2896 MHz.
Crystal CS8414 runs on 11,2896 MHz.
Philips TDA1315 runs on 11,2896 MHz.
The frequency of the transport is found either, on the LClock installation list found here, or determined
by following the procedures described in the generic LClock instruction, found here.
Should the two units not match, it is generally not possible to sync them together. However, is if one
units frequency is
an even multiplum of the other units frequency, then there are ways to get around the problem.
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