Rega DAC Retailers Guide

Rega DAC Retailers Guide
“On many levels, I found the
sound of the Rega DAC more
akin to that of their flagship
turntable, the P9 (which has
been a long term component in
my reference system). It shares
the P9’s quick and open
presentation with a healthy dose
of pace and timing.” TONE
AUDIO 12/10
Rega DAC Retailers Guide
Like Asynchronous: The USB input is not
asynchronous per se, but there are attributes, which
make the USB input a high-quality input, as it
incorporates a PLL based clock for low jitter audio
signal recovery. This recovered audio data is then
passed through the WM8805 PLL based receiver, so It
can be said the USB audio data has been re-clocked
and cleaned-up by the WM8805 receiver.
Unique Filters: 5 filters for standard res and 5 unique
filters for hi res files. Like more expensive DACS on Rega
uses filters that work at the extreme high end of the
frequency response of the selected sample rate.
24/192 Playback: TOSLINK and Coax can accept
the highest native resolution currently available.
Mission Critical Electronics: Careful attention has
been paid to the power supplies, analog
amplifiers(Class A) and use of capacitors in critical
areas. The control code, the part the tells the IC’s
and power what to do, is designed by Rega.
Special Power Supplies: The heart of the power
supply is a generously rated Toroidal transformer with
separate windings for the digital and analog audio
and the micro controller. There are total of 9 separate
power supplies using audio grade and low impedance
capacitors throughout. Fast diodes are used in the
rectifiers to help keep the switching noise down.
Isolated audio ground for SPDIF and USB connections.
Dirty power from the computer is completely
eradicated.
Entirely made in the UK and it costs only $995!
“Simplicity - as I wanted to keep the
signal path to a minimum. I know it’s a
bit of a traditionalist approach, but I felt
the inclusion of an up sampler would
over complicate the unit. The WM8805
and WM8742 running at the incoming
sample rate do a good job on their
own, along with a nice drop of old
school audio mojo in the discrete post
DAC analogue circuitry keep things
straightforward.”
“It’s worth bearing in mind that both
the Saturn and the Isis don’t use up
sampling either, and I wanted the DAC
to follow the same sprit of these units.”
“it’s worth remembering 192K is on
the high end of what the TOSLINK
can handle, so the quality of the
optical cable has to be taken into
account for reliable operation. I’ve had
the DAC working reliably at 192K with
a 2 Meter commercial grade optical
cable being driven from both a Xonar
ASUS Essence and Prodigy HD2
sound cards.”
“The PCB uses ground planes to
ensure low impedance earth paths,
which keeps earth induced noise in
the digital and analogue domains to a
minimum. The micro-controller has It’s
own ground and power supply.”
INSIDE STORY pt1
Dedicated “Class A” low
noise toroidal
transformer. One set of
windings for DAC and
all things analog.
Dedicated “Class A”
power supply
windings for digital
micro controller.
The co-axial and USB digital inputs are
electrically isolated from the audio ground,
which is floating with respect to the electrical
ground, this helps reduce noise and hum
loops when used in large multi-input system.
The PCB uses ground planes to ensure low
impedance earth paths, which keeps earth
induced noise in the digital and analogue
domains to a minimum. The microcontroller
has It’s own ground and power supply.
INSIDE STORY pt2
High quality I2S pipeline transmits
5
a super4 low jitter clock
and data signal.
3
6
7
8
TED
Saturn DAC (Using WM8742)
Note - SPDIF Data
WM8742 DAC
Analog Filter & Amp
D
USB I/P
RCA
WM8805 DIR
Daisy Chain..??
LED=RA1)
RX0 (LED=RA0)
ISO_TRANS
RELAY
I2S
I2S Digital O/P
LED=RA2)
Inputs
ANALOG OUT
Analog Filter & Amp
LED=RA3)
RELAY
DIR 3V3 (ANALOG)
TX0
SPI
For Future Use
RC3, 4 & 5
Micro (PIC)
SPI
Open Collector NAND..?
3V3 ANALOG..?
Mute RA5
De-emphasis
RCA
WM8742 DAC
DIR 3V3 (DIGITAL)
LED=RA4)
C
I2S
Power Up Delay
RB5
5V ANALOG & 3V3 DIGITAL (DAC)
RC2
RD7
RLA/MUTE/HOLD-OFF
Wolfson RC6
WM8805 PLL Receiver time
adjusts on
RC7the fly which is a form of
Tracked Tore
WM8805
& WM8742
clocking.
Includes a a hardware
buffer.
Results
RA2
RA3
RA4similar to using
Asynchronous technique. Input
Spare I/O's
+/- 12.7V ANALOG
VCC
B
Analog
DIR Supply Source
phase and the output phase is
matched by referencing the
Digital I/P #2 Digital I/P #3 Digital I/P #4
frequency and if all that is
RD2
RD3
RD4
RD5 RD6
matched up the timing will be
correct. Bass is improved, better
soundstage/imaging , pacing is
44.1K
48K
88.2K
96K 192K..??
more
accurate.
RE1
RB0
RB1
RB2
RB3 RB4
Two pro level Wolfson WM8742 DAC’s.
Each DAC
is connected
to its own
DAC & Analog
PSU
POWER IN
discrete output.
Digital
Power
3V3 (MICRO)
A
Digital PSU
Filter #1 Filter #2 Filter #3
Title
Filter #4 Filter #5
Size
Block Diagram For D/A Converter v03
Number
Date:
File:
3
4
5
6
Revision
ISS2/01/10
A3
29-Dec-2010
Sheet of
C:\Documents and Settings\A User\My Documents\Mikes
Drawn By: Stuff\DAC_Project.ddb
7
8
Use an external HD. You
get a bigger memory buffer
and an external power
supply.
Go into your midi or sound card
setting and select the external DAC
you want to use.
Make sure your sound card is
set to the native sample rate of
your source. Otherwise your
program will resample.
Use a quality optical, coax
and/or USB cable
Computer based volume controls are
convenient but they trim bit resolution.
Try avoiding this when seriously
listening.
For the non audiophile try to
use the least amount of
compression. 320k. is better
than 128k.
Audiophiles should
consider using a purpose
Use an external CD or
built computer.
DVD burner. Dedicated
power supply and a bigger
memory buffer make for
better music reproduction.
If you using iTunes choose Apple
Lossless, WAV or AIFF. Make sure
to check the “use error correction”
box. Turn off all EQ settings.
TSO’s RECOMMENDED
APPROACH TO SAFE
COMPUTER AUDIO
We recommend at least 2 gigabytes
for computer’s RAM. However, 4
gigs will create more room to process
lossless or lossy files.
Try using a passive power conditioner to see if
it makes things sound better Even see if your
computer takes an upgraded C15 power cable.
You might be surprised.
Rip your files at the highest setting
possible. AIFF and WAV feature no
compression whatsoever. FLAC and
Apple Lossless get zap empty space
cutting file size down by around 50%.
Lossless files are bit perfect but take more
processor power to sound good.
Make sure to have your internal
computer sound card handle all
system noises, beeps, etc.
Both iTunes and Windows Media
Player are fine for digital music file
storage and playback. If you are
doing lots of hi rez/normal rez
listening you may want to consider a
third party overlay.
If you are using a dedicated computer you will want to
prevent services from loading into your task bar or
menu bar. Background processes can potentially
cause sonic degradation. You don’t want programs
hijacking your music specific resources that can cause
problematic time errors. You want your file to be
completely intact before it reaches the DAC. If your
DAC works harder it creates more jitter.
FLAC is not a native iTunes file type.
You can use programs like MAX,
FLUKE and other software to convert
these FLAC files to AIFF or
Quicktime. Transcoding that makes
this possible.
More is not always better. 48k is not a native CD
format. Use the 44.1 output on your sound card
when playing back redbook sourced files.
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