Crystal Vision
Installation
TANDEM-300 User Manual R1.2
70
14/02/2008
Using monitoring outputs
TANDEM-300 has a very powerful 16-source audio monitor router. The dual channel
output is converted to a balanced stereo signal and is fed to the card edge headphone
socket. The same signal can also be made available at the rear connector. Any of the
following 16 stereo audio signal sources may be selected:
•
8 de-embedder outputs; A1+2, A3+4, B1+2 and B3+4
•
8 de-embedder router feeds to output sub-PCB cards; I1+2, I3+4, J1+2 and
J3+4, if available (routing may affect channel assignment)
•
8 direct input sub-PCB card outputs; G1+2, G3+4, H1+2 and H3+4, if available
•
8 embedding router feeds to embedders; C1+2, C3+4, D1+2 and D3+4
The analogue output is in the form of four wire connections, each wire carries Left+, Left-
, Right+, and Right-, which form two balanced line drivers. The '+' and '-' outputs each
being true and complimentary (inverted) drives from each signal source.
If an analogue monitoring bus output is selected, the analogue monitoring audio four-wire
circuit is connected to the 26 way high density connectors or the rear extension of the rack
frame, and also to extra pins on the RM04.
If an AES monitoring bus is selected, the 4 wires may be re-assigned to the AES bus.
These same connections will then carry unbalanced digital audio as AES_mon_1,
AES_mon_2, AES_mon_3 and AES_mon_4.
The AES bus is NOT selectable in the same way as the analogue monitoring output. The
4 AES monitor outputs are automatically routed as follows:
Side 1
De-embedder A ON
Input card fitted
(excluding Mode 3)
De-embedder A OFF
or no input card #1
AES mon 1
si1A 1 + 2
ai1G 1 + 2
‘-‘ digital silence
AES mon 2
si1A 3 + 4
ai1G 3 + 4
‘-‘ digital silence
Side 2
De-embedder B ON
Input card fitted
(excluding Mode 3)
De-embedder B OFF
or no input card #2
AES mon 3
si2B 1 + 2
ai2H 1 + 2
‘-‘ digital silence
AES mon 4
si2B 3 + 4
ai2H 3 + 4
‘-‘ digital silence
AES silence will be output if there is no suitable source for that AES output and if Demux
A or B are set to ON, but have no selected Audio Group input present. Column three does
not apply to Mode 3, as RS4 cards can not receive any external signal inputs.
A number of TANDEM-100, TANDEM-300 and Demon modules may be wired to a
shared pair of active loudspeakers. Audio levels to be monitored via the analogue bus or
using headphones should not 10 VU (-8 dBFS) or overload distortion may occur.
When 'OFF' is selected, the Bus goes high impedance. Should two or more TANDEMs be
selected as 'Bus ON' when there are multiple TANDEMs sharing common active
loudspeakers, the audio will be the sum of all channels set to ON. In this case the output is
likely to suffer distortion at high signal levels.
TAD202 has a dedicated analogue audio bus output, which can NOT be switched to a
high impedance state. TAD202 can not share the same analogue bus connections as
TANDEM-100, TANDEM-300, & Demon.
