B&K Reference 21, Owner'S Manual

Page: 19 / 88

15
DIGITAL CONNECTIONS
Connect digital inputs (DVD, VLD, etc.) to the processor. You will need either coaxial or optical digital inputs to
play Dolby Digital (AC-3) or DTS surround sound processing. Digital connections are also recommended for PCM
sources. If your source has both optical and coaxial outputs connect only one.
Coaxial digital inputs - Standard RCA type
connectors. Attach one end of your digital coaxial cable
to your source coaxial digital out and the other end to
the appropriate processor coaxial digital (orange) input.
Optical digital inputs -
First, remove the cap on
the optical digital input. Save the cap. Attach one
end of your digital optical cable to your source and
the other end to the appropriate digital input on the
back of the processor.
Connecting A Laser disc Player -
Dolby Digital
(AC-3) laser discs use a special technique called AC-
3 RF to encode the Dolby Digital bitstream. If the
laser disc player is capable of playing back Dolby
Digital discs it will have a separate output for this
bitstream in addition to the normal coaxial and/or
optical outputs. Do not connect the AC3-RF output
directly to your processor. The AC-3 RF bitstream
must first be converted to a normal (non-RF) Dolby
Digital type signal. It is recommended that a B&K DT-
1 be used to convert and select between the Laser’s
AC-3 RF and PCM/DTS signals. The output from a
DT-1 will automatically select between the connected
PCM/DTS bitstreams and the converted AC-3 RF
Dolby Digital signal. Other AC-3 RF to Dolby Digital
decoders may not make this switch
automatically.
Connect the laser disc’s AC3-RF output to the DT-1’s AC-3 RF input. Connect either the laser disc player’s PCM
coaxial or optical digital output (not both) to the DT-1’s coaxial or optical input. Connect the DT-1’s coaxial output
to the desired coaxial digital input on your processor.
Digital Outputs -
Separate
and independent coax digital
outputs are available for
Zone 1 and Zone 2. Connect
to a digital recorder (CD-R,
mini disc, DAT, personal
computer, etc.) These signals
are the same as the incoming
digital signal from the
selected source on each
zone. If your digital recorder
has both optical and coaxial
inputs you need only connect
one. Zone 1 selected digital
input is converted to both
coaxial and optical. You may
connect one digital recorder
to the optical output and
another recorder to the coaxial.
Zone 2 digital output is coax.
Coax digital input
from DVD output
SAT DVD CD
TV V2 V1
COAX DIGITAL
V2 DVD CD SAT
OPTICAL DIGITAL
Optical digital output
from source
V1
Coax digital input
from VLD output
SAT DVD CD
TV V2 V1
COAX DIGITAL
MAIN
OUTPUT
AC-3 RF
INPUT
COAX
INPUT
AC-3 RF input
from VLD output
DT-1
Zone 1 (A) Optical digital output
to digital recorder
V2 DVD CD SAT
OPTICAL DIGITAL
OUT V1
SAT DVD CD
TV V2 V1
COAX DIGITAL
ZB OUT
ZA OUT
Zone 1 (A) Coax digital output
to digital recorder
Zone 2 (B) Coax digital output
to digital recorder