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G25U Esoteric master clock generator
and PCM digital audio up-converter
“If you own a digital source
that can output PCM digital audio signals, the G25U can provide
an instant upgrade for your entire CD/DVD collection, either through master clock re-timing and/or through digital audio PCM up-conversion,
both at a very affordable price!”
G-25U functional descriptions:
The G-25U contains a highly accurate, internal crystal oscillator
known as a “Master clock.” This “clock” reduces
system noise and digital artifacts (digital jitter), dropping the
noise level between a DAC and a digital transport to less than 1/100th
of non-synchronized devices. The master clock also re-times the synchronization
between the DAC and transport, providing highly accurate digital
audio signals for improved analog decoding. A more accurate master
clock results in higher accuracy in reading and decoding digital
data. This adds extraordinary ambience, imaging and clarity to a
digital audio signal by removing inter-component jitter.
To utilize the Master clock function, you will need a separate DAC
and transport with “Word sync” or “word clock” input
on the DAC. For a combined DAC and transport, a connector for “Word
sync” or “word clock” input is required.
The G25U “clock,” allows precise digital playback and
enhances existing systems. This is realized by linking all digital
playback components that allow external time management together
under the control of just one master clock. Literally, all digital
devices are operating to a single heartbeat, maximizing the merits
of digital audio.
Even if your connected component has no “Word sync” or “word
clock” input, the G-25U improves accuracy by re-timing a PCM
data stream. This is done by using a digital audio input on the G25U,
and connecting it between any audio/video device equipped with
a digital PCM audio output (CD/DVD players, digital tuners,
satellite receivers, high definition cable boxes, etc) and the digital
input of your receiver/pre amp/processor. If your digital players
allow the user to select the digital output format between “Stream” and “PCM” for
Dolby Digital, DTS or other formats, then the G-25U can be inserted
in the digital stream to re-clock, re-time and “clean-up” this
PCM digital transmission.
Note: Your receiving device (processor, pre-amp, receiver,
et cetera) must be able to accept and decode Dolby Digital or DTS
PCM data.
An example of use would be a pre-amp processor or separate components
with coax or optical digital input, and an inexpensive CD or DVD
player with coax or optical digital PCM output. In this situation,
you can use the G25U to re-time the data stream by connecting the
CD/DVD player digital audio output to the G25U input, then connecting
the G25U digital audio output to your pre-amp processor. This often
results in a smother, more transparent signal.
The G25U also includes digital audio up conversion,
allowing you to output a digital audio signal path at selectable
levels up to 192 kHz. Re-sampling the digital data stream (up to
32 times), allows for red book CDs and DVD's to sound better. Ambience,
depth of field, imaging and clarity are all dramatically improved.
Note: This unit up-converts linear PCM signals only. Dolby Digital,
DTS or other format signals cannot be up-converted.
Up-conversion “upgrades,” the investment you have already
made in DVDs and CDs. Your collection may astonish you once you begin
to hear what you have been missing!
In addition to user selectable up conversion, the G25U includes proprietary
Esoteric digital filtering. This effectively
reduces noise artifacts and allows the digital signal to actually
sound more “analog.”
The G25U has a rigid body construction combined with elegant styling.
2mm thick steel chassis and 15mm aluminum faceplates are used. Three
pinpoint isolation feet support the chassis. These feet maximize
the stability of the crystal clock by allowing the unit to be mechanically
isolated from internal and external vibrations that can affect the
accuracy of the clock. The front panel design is highly elegant with
a brushed aluminum finish. The front panel displays all the current
settings at all times.
Conclusion:
The G-25U is a hybrid “PCM digital audio up converter” and
a 'master clock generator'. As a D/D converter, it can convert digital
audio frequencies from red book CD standards all the way up to 192
kHz, improving sound quality by over sampling and re-timing a PCM
digital audio data stream. As a master clock generator, it can process
word clock signals by its internal, high precision crystal oscillator.
This master clock is accurate to +/- 1ppm. (Measured as 1 part per
million. Most CD/DVD devices are accurate to +/- 10-50 ppm).
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Download the G-25U PDF
View the Owners Manual.
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