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The EPL and
Tape Loop
Systems
The actual audio attenuation elements are passive
optically-
controlled resistors, arranged in a special CYBER-OPTIC
control circuit (patent applications in progress) which allows a
combination of very low distortion and stereo tracking accuracy
(typically
0.1dB)
not previously possible in a passive, continu-
ous control system.
The BALANCE control produces approximately 13dB maxi-
mum cut in one channel, while boosting the other channel by
3dB-to
maintain constant music power during control panning.
This simplified signal flow diagram can be very helpful in
understanding the discussion of the EPL and TAPE loops.
In IRIS, the EPL output jacks and RECORD output jacks are
activated only when the related panel switch is engaged. This
completely disconnects the inputs of unpowered
accessories-
often a cause of distortion. These buffer-fed jacks have
2.15k
ohms output impedance.
The EPL (External-Processing-Loop) system consists of the
EPL switch and the EPL output and EPL input jacks. When the
EPL switch is engaged, you may use the EPL outputs to feed
into an external accessory, and receive its returning output on
the EPL input jacks. You can alternatively employ the EPL input
jacks as an 8th HIGH Level input.
The tape system on IRIS comprises two pairs of TAPE input
jacks, two pairs of RECORD output jacks and six related control
switches.
Note that the TAPE input jacks are selectable either by the input
selector KEYS, or by the tape MONITOR switches. These jacks
receive the OUTPUTS of tape decks.
For PLAYING tapes you will likely prefer to use the tape KEYS
for selection-particularly as these functions are accessible
from the IRIS remote.
The four round buttons associated with tape functions are not
needed for normal tape playback.
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