Chord Electronics Dac 64 Owners manual
Choral Series - quick guide to connections and settings
BLU – Upsampling CD transport
Clock Switch UP 44.1kHz Dither Switch UP 24-bit (NORMAL)
MID 88.2kHz DOWN 16-bit (HIGH)
DOWN 176.4kHz Dual Data
To use Blu with DAC64 (2x BNC input version), run one BNC-BNC cable from Dual Data Output 1 to Dual Data Input 1; and a
second BNC-BNC from Dual Data Output 2 to Dual Data Input 2.
Do not use the Dual Data outputs with 88.2kHz or 44.1kHz selected, this will cause distortion from the DAC.
Only change sampling frequency with volume muted or with the system switched off.
The optical output sends at 88.2kHz when 176.4kHz is selected.
DAC64 – 64-bit D-A converter
Input Selector UP Optical RAM buffer UP No buffer
MID AES/EBU MID Low buffer (1 sec delay @ 44.1kHz)
DOWN Dual or single BNC DOWN High buffer (4 sec delay @ 44.1kHz)
The first generation of DAC64 has single BNC input. To use it with the Blu CD transport, run a single connection at 88.2kHz.
When using the Dual input DAC64 with a single connection ie. from a different CD transport, use the lower BNC input.
Always use shielded 75 ohm coaxial digital cables; please avoid phono-BNC adaptors.
SYMPHONIC - Phono stage
The gain and impedance levels should be added together eg. for a desired impedance of 300 ohms, select both 270 and 33 ohms.
FOR FULL DETAILS PLEASE REFER TO THE PRODUCT MANUALS
1
S/DIF2
OUTPUT
Clock
Switch
Dual Data
Output 1
Word Clock
Input
Optical
output
AES/EBU
Output 1
AES/EBU
Output 2
Dual Data
Output 2
Mains input
and switch
Dither
Switch
Right output
RCA–phono
Input
selector
RAM buffer
switch
Dual Data
Input 1
Dual Data 2
or BNC coaxial
Left
XLR Right
output
Left output
RCA–phono
AES/EBU
Input
Optical
Input
XLR Left
output
Mains input
and switch
Left output
RCA-phono
Right output
RCA-phono
Right input
RCA-phono
Left input
RCA-phono
Gain (dBv)
85 74 68 58
Rumble Filter
(IN = active)
Earth screw
Impedance
33R 100R 270R 4K7R 47kR 150
p
F
Balanced (IN)
RCA
(
OUT
)
XLR Right
input
XLR Right
output
Mains input
and switch
XLR Left
input
XLR Left
output
IR sensor
Display
Volume
Balance
Input selector Record selector
PRIMA – Balanced pre-amplifier
Each input has its own user-selectable gain setting – so if you are experiencing distortion you should reduce the gain for that input.
Chord Touchsreen remote – Select “Choral Series”; then press “MAIN LINE LISTEN” quickly followed by Vol+ or Vol-
Chord Preamp remote – press “BUS A” quickly followed by Vol + or Vol -
When using the recommended balanced connection with DAC64, select Gain 0.25.
Prima main controls
MEZZO Power Amplifiers
Phase switch UP Non-inverting
DOWN Phase inverting
Bridged Mono mode
Mezzo; Mezzo 50
To run Mezzo or Mezzo 50 as a bridged mono amplifier, proceed as follows:-
Connect an XLR splitter lead from the same preamp output to each XLR input of the Mezzo, or if your preamp has two outputs per
channel, connect the same channel to both inputs on the Mezzo.
Select Right phase switch DOWN, and Left phase switch UP. The Right Speaker + terminal is now positive and the Left Speaker +
terminal is now negative.
Mezzo 140
Mezzo 140 features an ‘automatic bridging mode’ so you only need to connect the Right input (XLR or RCA).
Select Right phase switch DOWN and Left phase switch UP - now the Right Speaker + is positive and Left Speaker + is negative.
FOR FULL DETAILS PLEASE REFER TO THE PRODUCT MANUALS
2
--------Main output - XLR ----------Line 2 input
RCA-phono
L R
L R
L RL RL RL RL R
--------Line 1 input - XLR ---------- Line 3 input
RCA-phono
Line 4 input
RCA-phono
Line 5 input
RCA-phono
Record output
RCA-phono
Mains input
and switch
Left Speaker
Output
Phase switch
Right
Phase switch
Left
Left input
RCA-phono
Right input
RCA-phono
Mains input
and switch
Right input
XLR
Left input
XLR
Right Speaker
Output
LINE 1
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