Hafler IRIS Owner'S Manual Download Page 16

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Even if you are experimenting, you must replace the cover

before re-plugging in the unit to AC-not only for safety reasons,
but to shield hum and interference which can totally invalidate
any attempts at sonic evaluation.

CAUTION:

When low value resistors are installed and automatically se-

lected by the high-gain MC position (button IN) of the PHONO-

GAIN switch, accidentally using this setup for a HIGH OUTPUT

cartridge can result in deceptively normaloutput levels, but with
improper cartridge frequency-response.

RES I STOR

CAPACITOR

I R I S

IRIS WITH COVER REMOVED.

SHOWING LOCATION OF OPTIONAL

CARTRIDGE LOADING PLUG-INS.

Summary of Contents for IRIS

Page 1: ......

Page 2: ...on Page 14 Specifications Page 16 Warranty Page 18 INTRODUCTION Your IRIS preamplifier combines superb all discrete J FET amplification stages with unique control methods allowing unprecedented flexibility and convenience In this manual beyond telling you how to use IRIS we will try to convey the spirit and methodof how this unusual combination was achieved The J FET devices share many technical a...

Page 3: ...can be susceptible to pickup of hum from strong external magnetic fields Such fields are usually strongest from power amplifiers but can also come from other equipment When stacking or racking your equipment you may have to do so as to minimize this potential problem 2 The IR infrared eye for the IRIS remote system is behind the dark red screen above the Record 1 switch The IRIS remote system comb...

Page 4: ... preamplifier Input IRIS employs a very low noise high gain complementary Connections symmetry phono circuit of selectable gain derived from our and Selection U S patent 4 496 910 The phono stage output is selected by Phono the PHONOKEY and then processed the same as other HIGH LEVEL inputs The phono inputs gold jacks are compatible with normal MOVING MAGNET and HIGH OUTPUT MOVING COIL cartridges ...

Page 5: ...election by FET switches followed by matched J FET buffers Excepting phono all input impedances for the entire preampli fier are in the 15 28k ohms range To get you to the basic operation of IRIS as quickly as possible we have deferred the discussion of EPL and TAPE loops to a later section The MONO switch effects a passive combining of the stereo channels into monaural fed through the attenuator ...

Page 6: ...ted into memory This period is about five seconds during which the MAIN outputs of the preamplifier are muted At the end of this turn on safety period the MUTE indicator will go out and the TUNER legend will light TUNER mode is designed as a reset state to facilitate easiest turn on for background music etc Any of the other seven inputs may now be selected by their appropriate KEY The MUTE KEY cau...

Page 7: ... 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 e...

Page 8: ...IRIS FUNCTIONAL BLOCK DIAGRAM ONE CHANNEL SHOWN MON I TOR SWITCH MON I TOR SWITCH 1 2 0 e 0 A 7 bREC 2 CUT EPL I N MAIN OUT 7 ...

Page 9: ...E Select deck 1 as PLAYER with TAPE KEY 1 and send to deck 2 through the RECORD 2 switch and jacks 1 OR Select deck 2 as PLAYER with TAPE KEY 2 and send to deck 1 through the RECORD 1 switch and jacks CAUTION Engaging either RECORD switch on IRlS brings into action special safety logic which you may easily interpret as faulty operation until you understand its put pose 1 IRIS refusesTAPE KEY 1 if ...

Page 10: ... deck s OUTPUT while its INPUT is being fed from any source selectable by the KEYS This feature is necessary for selectable by the KEYS This feature is necessary for real time monitoring in three head decks but can be of some value for signal path verification in two head decks Engaging both tape MONITOR 1 and tape MONITOR 2 switches results in the selection of tape MONITOR 2 Make it a habit after...

Page 11: ... you will likely find that the remote will communicate well to most preamplifier locations without having to aim the transmitter but every room is different in the IR world so you should experiment for best results possibly also re reading the preamplifier location recommendations earlier in this manual The top eight KEYS operate much like the input selector KEYS on your preamplifier However from ...

Page 12: ...ta sets to Digital to Analog D A conversion overriding the analog DC Voltages of the preamplifier s knobs to the CYBER OPTIC attenuator system To give you completely natural and safe analog command of VOLUME and BALANCE at both preamplifier panel and re mote IRIS automatically transfers control authority immedi ately to whichever knob set you use Control stays there until you use the other set of ...

Page 13: ...OLUME control to normal level and operate as usual The preamplifier s CYBER OPTIC level control system has essentially infinite resolution as no digital steps are used In the remote V B transmission mode IRIS employs 8 bit or 256 step format to obtain resolution essentially indistinguishable from preamplifier panel operation For VOLUME the command step size is approximately 0 25dB increasing in th...

Page 14: ...shing telling you that IRIS refuses to enter TUNER or CD changes from the remote during recording This KEY is included to minimize the risk of system obsoles cence by allowing for future accessories which may require more detailed instructions than can be provided by IRIS usual easy single keystroke commands You can preview this operation and also observe the STEADY MUTE LED flashing discussed abo...

Page 15: ...e loading is a fine turning matter and many cartridges work quite well without it ONLY a cartridge s manufacturer can provide proper recommendations for this process as every cartridge is different And ONLY you can say for sure whether or not it produces meaningful sonic improve ment for you For those who wish to change the factory installed loading we have included a very flexible system which au...

Page 16: ... When low value resistors are installed and automatically se lected by the high gain MC position button IN of the PHONO GAIN switch accidentally using this setup for a HIGH OUTPUT cartridge can result in deceptively normaloutput levels but with improper cartridge frequency response MC RES I STOR CAPACITOR bflrr I R I S 1tt11 II 88 0 0 0 0 0 0 IRIS WITH COVER REMOVED SHOWING LOCATION OF OPTIONAL CA...

Page 17: ...ts RMS 20Hz 20kHz 20Hz 20kHz Moving Magnet 002 Moving Coil 009 For 0 5 volts RMS 1 kHz Moving Magnet 6 0 mV RMS Moving Coil 600 p V RMS A weighted relative to 0 5 V RMS Moving Magnet 87dB Moving Coil 8OdB 1kHz Moving Magnet 65 mV RMS Moving Coil 6 5 mV RMS Nominal 47 000 ohms Moving Magnet 220 pF as supplied user adjustable Moving Coil 100 ohm as supplied user adjustable 1kHz Moving Magnet 38 5dB ...

Page 18: ...LIn Outputs Record 1 Record 2 EPL Out Line Controls input Selectors Phono gain Mute Normal Record Send 1 Record Send 2 Tape Monitor 1 Tape Monitor 2 External Processor Loop engage Mono Balance Volume Power convenience Polarized 1 Unswitched 2 Switched 5 amp continuous Outlets 72 amp surge Size 17 wide x 3 high x 8 1 2 deep TRANSMITTER Controls Input Selectors or as redefined when IRIS compatible u...

Page 19: ...en eliminate the need for factory service The Hafler IRIS is warranted for 3 years from date of purchase including parts labor and return shipping costs from the factory to the owner within the Continental USA It is the owner s responsibility to pay shipping preferably UPS to the factory collect shipments will not be accepted Units under warranty should be accompanied by a copy of a dated Bill Of ...

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