Description:
QA550 is designed to replace the CD transport of your HiFi
system. This digital music player just simply streams the
music WAV files in the most popular 16bit/44.1KHz format on
the SD card to the digital outputs with high accuracy and
low jitters.
The simple the best and sound quality is the most important
thing for a true HiFi system.
SD Card is the most popular media card in the market, and
most CDs carry 16bit/44.1KHz WAV files. You are free of
worrying about any mechanic problem on the CD player and
wearing out of CDs once you put 16bit/44.1KHz WAV files on
SD Cards. We choose this combination to keep things simple
so we can focus on the sound quality.
We developed a single threaded real time program running on
a PIC 16bit MCU without any interrupt to steam the music
files, other control functions are carried by another
separated microprocessor. It achieved extremely high
accuracy on the time sequence when streaming music files
from the SD card. Moreover a special customized 11.2896 TCXO
with jitter lower than 10PS is used as the main sampling
clock.Thus the whole system reached our goal on the recovery
of musics.
It effectively isolated the serious interference from within
the PC/Mac case. e.g. the high frequency data signals, the
switching-mode power supply and the FAN motors, etc
The ideal CD transport is not a CD
transport, its one of these WAV SD transports.
Reasons why the QA-550 is better than a traditional CD
transport...
- No moving parts to wear out.
Consistant performance every time!
- Won't suffer from stability issues
caused by dust, dirt or smoke
- No reason to take your valueble CDs
out of their cases each time you want to listen
- WAV files are error corrected so
don't need real time error correction unlike CDs
- Far less jitter than most CD
transports / players, even very pricey ones. Sounds
better
- Totally resistant to vibrations. No
skipping nor any need to keep on expensive Hi-Fi rack
- High Accuracy system clock ensures
jitter level is miniscule
- Whole box sets of your favourite CD
music collections can be captured in glorious,
uncompressed WAV format onto a tiny SD card no bigger
than a postage stamp!
- Can be used to play music for
extended periods for equipment "burn ins". No mechanical
parts such as lasers or motors to wear out
About WAVs...
WAV files are the favourite format choice
of people who can't bear the sonic difficiencies of the
lossy compressed MP3 format yet want to store, preserve and
playback treasured CD collections from their computer hard
disk drives.
Up until now, these people would simply be
content to use their computer as their main Hi-Fi source
component.
Whilst excellent at converting CDs to WAV
files, the PC / Mac is still not the ideal music plackback
device. The majority if PCs don't have the best
powersupplies and are absolutly packed with noisy,
interference inducing components. Multiple noisy fans buzz
away constantly and due to components fighting over limited
resources, "pops" and stutters on the audio are not
uncommon.
In these days of hugely expensive utility
bills, the electricity consumed in putting a computer to use
for considerable periods just for music playback is also
quite considerable as is wear and tear to the hardisks.
Reasons why the QA-550 is a better
music transport than a PC...
- Silent (no moving parts)
- No pops stutters or audio glitches
(assuming that WAVs were extracted with love by EAC)
- Uses nowhere near the amount of
energy that a PC needs
- Far more compact than even the
smallest laptop PC
- Useful remote control functionality
Specifications...
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