Hafler IRIS manual The EPL and Tape Loop Systems

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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