Hafler IRIS Stereo Amplifier User Manual
Contents
1. 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 IRIS FUNCTIONAL BLOCK DIAGRAM ONE CHANNEL SHOWN SIHCLIAS 134 25 RE m c REC 1 REC 2 AON1 TOR z SWITCH g MON I TOR 2 m SWITCH OUT EPL IN TIANNVHI 3H10 OL Recording System Any recording requires that you activate either the RECORD 1 jacks the RECORD 2 jacks or both using the RECORD 1 or RECORD 2 switches on the panel As seen in the signal flow diagram this makes any input selectable by the KEY2. 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 the deep cutoff region For BALANCE the command step size is typically 018 Engage either RECORD 1 or 2 your preamplifier You will find that most of your remote KEY functions are not being accepted at the preamplifier but VOLUME BALANCE MUTE AND NORMd working as usual This unique IRIS feature allows you to retain convenient remote control of those functions which come AFTER the RECORD OUTPUT jacks in the preamplifier signal path but keeps you from accidentally input ting any commands which would spoil your recording process An INTERRUPTED flashing of the preamplifiers MUTE indica lor tells you which functions it will not accept during this safety mode sx Serial eXternal KEY Battery Replacement The rear of the IRIS receiver card has a recessed keyed male connector which carries needed digital signals for allowing the IRIS system to be connected to coming Hafler IRIS compatible accessories in a manner similar to which dispersed computer terminals can share the same data lines without confusion The TUNER legend commands already on the remote will automatically route to the soon coming IRIS compatible TUNER after you have selected TUNER if it is powered Similar logic exists on the CD
3. safe for lexan and painted surfaces DO NOT use paper towels or any coarse material to clean the face plate as these materials may scratch the insert IRIS is shipped with styled end caps on its front panel Rack mounting ears are available from the factory for standard 19 wide racks In locating IRIS keep these factors in mind 1 All preamplifiers with high gain moving coil phono circuitry 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 R infrared eye for the IRIS remote system is behind the dark red screen above the Record 1 switch The IRIS remote system combines a powerful transmitter and very sensitive receiver resulting in highly reliable communication under conditions where many remotes will not work However best operation usually results if the preamplifier is located AT or ABOVE the height at which you will typically use the transmitter 3 It is also desirable that the IR eye not have to look directly at extremely bright light sources particularly those of fluores cent nature Such conditions can impede communication reli ability Power Connections Input Connections and Selection Phono IRIS is internally connectable for virtually all AC line power systems
4. 7 000 ohms Moving Magnet 220 pF as supplied user adjustable Moving Coil 100 ohm as supplied user adjustable 1kHz Moving Magnet 38 5dB Moving Coil 58 5dB 20Hz 20kHz 0 1dB 6Hz 1 50kHz into 1 Ok ohm load 8 volts RMS 20Hz 20kHz 16 Total Harmonic Distortion 8 Noise Sensitivity Signal to Noise Ratio Input Impedance Gain Output Impedance GENERAL Inputs Outputs Controls convenience 005 20 2 20 2 2 volts RMS For 0 5 V RMS Output 75 mV RMS 97dB A weighted relative to 2 0 V RMS 15 28k Ohms 20dB Line Out 316 ohms Record Out 2150 ohms Phono MMM CD Tuner Video Aux 1 Aux 2 Tape 1 Tape 2 EPL In Record 1 Record 2 EPL Out Line 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 Polarized 1 Unswitched 2 Switched 5 amp continuous Outlets 72 amp surge Size TRANSMITTER Controls Size Batteries 17 wide x 3 high x 8 1 2 deep Input Selectors or as redefined when IRIS compatible unit s are presen SX Clear Mute Normal Volume amp Balance Knobs 2 7 8 wide 11 1 2 high 7 1 2 long 4 x AA Alkaline FACTORY SERVICE AND LIMITED WARRANTY If you encounter anydifficultyor have anyquestionsconcerning your IRIS preamplifier please call our Customer Service De partment weekdays 8 am to 3 30 pm Moun
5. Hafler Iris Preamplifier IVNNVN SH3NMO AND REMOTE CONTROL SYSTEM It is good habit to turn down BOTH remote and main panel volume controls upon system shut down This will avoid possible sudden and unexpected changes in volume when system is re activated TABLE OF CONTENTS Introduction ss Page 1 installation 2 S Le Page 5 IRIS Block Diagram Page 7 Using the IRIS Remote System Worte Page 10 0 v rii oa B E Page 14 Specifications issus Page 16 Wattarty iion mia oda 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 and sonic charac leristics with the best of vacuum triodes They also allow things vacuum tubes don t easily allow such as high speed and very low noise INSTALLATION The gloss black insert on the face plate of your new Hafler Equipment has been packaged with a removable protective coating Please peel off this protective coating following in stallation When cleaning the face plate we advise a soft cotton cloth with a non abrasive cleaner that is
6. S available to these outputs EXAMPLE KEY selecing TUNERwith RECORD 1 depressed will send both TUNER channels out the RECORD 1 jacks to the INPUTS of the tape deck The diagram also shows that if you have two decks you can select either as a PLAYER using the TAPE KEYS and send it to the other deck for recording EXAMPLE Select deck 1 as PLAYER with TAPE KEY 1 and send to deck 2 through the RECORD 2 switch and jacks 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 IRIS brings into action special safely logic which you may easily interpret as faulty operation until you understand its 1 IRIS refuses TAPE 1 if RECORD 1 is engaged Likewise for TAPE KEY 2 and RECORD 2 These are potentially danger ous sources of unexpected high energy positive feedback loops having been known to destroy more than a few loud speakers 2 These switches automatically restrict certain remote control actions as explained later Thus always leave these switches OUT unless actually re cording Tape Monitoring Switches The tape MONITOR switches at first appear to allow only a redundant selection of what you hear from your deck s when you use the TAPE KEY s The important difference is that MONITOR switches actually BREAK the audio path inside the preamplifier allowing you to listen to the decks OUTPUT while its INPU
7. T 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 recording to check that all six of the round buttons are back OUT unless you are using EPL or MONO USING THE IRIS REMOTE SYSTEM Infrared Remote Integrated System INTRODUCTION Key Command Transmissions volume Balance V B Command Transmissions The IRIS preamplifier achieves its infrared IR remote capabil ity by the addition of the IRIS remote RECEIVER board which plugs into a keyed male connector at the top of the preamplifier s Command Memory Display CMD board containing the front panel key switches and legend LED s IRIS employs a carrier of bright IR pulses modulated in frequency 25 35 kHz by a 32 bit Pulse Code Modulation PCM signal The carrier is also amplitude modulated for clocking synchronization This code must pass stringent format check ing at the receiver to ensure communication security The IR pulses radiate from the two clear LEDs arranged in a V formation protruding through the remote s bezel Dominant radiation is to the front where the minute lenses are located but considerable radiation is available to the s
8. Units not marked otherwise on the rear panel are connected for 120 Vofts 50 60 Hz Two SWITCHED outlets and one UNSWITCHED outlet U S 120 Volt standards are provided on the rear panel The UNSWITCHED outlet is provided for powering certain me chanical equipment if so recommended by its manufacturer The SWITCHED outlets can be used for all other devices up to a total for all outlets of 580 Watts continuous rating The IRIS power switch is very rugged and can sustain the turn on surge of large amplifiers However some audio purists prefer to connect large power amplifiers through alternate line supply arrangements to minimize any added magnetic fields in the low signal environment of their preamplifier IRIS employs a very low noise high gain complementary symmetry phono circuit of selectable gain derived from our U S patent 4 496 910 phono stage output is selected by 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 typically 2 5 mV and LOW OUTPUT MOVING COIL cartridges typically 0 2 0 5 mV Input impedance is 47k ohms except when optional cartridge loading is employed This is discussed at the end of this manual The rear panel MM MC switch next to the phono jacks when depressed increases phono stage gain by 20dB for LOW OUTPUT MOVING COIL cartridges CAUTION Neve
9. atteries are removed Carefully observing these polarity markings replace all 4 batteries 3 Check IMMEDIATELY for normal transmitter operation by observing the RED transmitter indicator It should now flash brightly 4 Replace the bottom cover making sure to orient it for the Screw pattem and replace the 4 screws CARTRIDGE LOADING Instructions For Qualified Personnel only Optional cartridge 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 automaticaly switches loading components when MM or MC is selected Your preamplifier has been supplied with 100 ohm resistors and 220 pF capacitors installed in the appropriate sockets While these values are suitable for most cartridges you may wish to alter them as described below The preamplifier must always be UNPLUGGED from AC before removing its cover Full AC line voltage is present at numerous locations inside the unit Remove the 4 screws under the unit which securethetopcover and slide it off to the rear The diagram below shows how to cut form and plug in optional loads Observe carefully which sock ets are fo
10. d for the optimum reproduction of treasured mono recordings and can be employed to check for exact system balance It is highly recommended that where you may have a constant monaural source such as a mono TV that you secure a Y splitter from an electronics store and feed both preamp chan nels in parallel This makes remote operation easier and avoids accidentally leaving MONO engaged when you switch back to a stereo source OPERATION Turn On Off logic Muting System Volume Balance System CAUTION The EPL switch and the tape MONITOR switches explained later are often the cause of an apparently dead system when they have accidental been left engaged Always check them first if a system is found dead on turn on For now make sure that all six of the group of round button switches are intheirOUT position When IRIS is powered up the MUTE legend will light alone along wih a smal GREEN indicator between the knobs called the VOLUME BALANCE V B indicator The V B indicator shows that the IRIS panel knobs are determining VOLUME and BALANCE Its operation is explained in the remote section During this period none of your KEY inputs will be accepted 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
11. e remote knobs on the FIRST flash of this indicator After the transmission this indicator will then remain UNLIGHTED indicating that V B control has moved from the preamplifier PANEL knob settings to those of the REMOTE knobs V B control will return to the preamplifiers knobs if either is slightly TURNED indicated by the V B LED returning to its statically LIGHTED state 11 Remote V B Resolution Record Security and Umbilical systems Note Which V B knob set is in command is unaffected by ANY KEYS remote or preamplifier It depends ONLY in where the LAST V B command came from including the effects of pream plifier power up discussed earlier CAUTION Since the IRIS remote is fun for many adults it is likely that small children will also find it so After a system turn on the REMOTE knobs may not be set where you left them at last listening If you then TOUCH either remote knob you may suddenly have a lot more level than you expected Your instinctive reaction of quickly reducing the remote VOL UME setting will take this level down very quickly However in such situations a better approach is to use a remote KEY to either 20dB MUTE the system or select an unused or dead input BEFORE TOUCHING either remote knob then restore the remote VOLUME control to normal level and operate as usual The preamplifiers CYBER OPTIC level control system has essentially infinite resolution as no digital steps are used In the
12. ides and rear of the array Thus 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 REMOTE you must hold the KEY long enough to get at least one flash from the RED Completed Frame LED at the top front of the remote The bottom KEYS MUTE and NORMAL operate similarly The remaining two KEYs CLR and SX are explained later Bothof the remote s knobs are connected to a capacitive touch sensing circuit Touching either knob ALONE causes the remote to transmit the position of BOTH knobs to the IRIS receiver The process takes approximately 1 8 second At each successive 1 8 second a new 32 bit frame of knob position data is trans mitted tracking your knob motion until slightly after you release the knob 10 Automatic Transfer of V B Control Note The touching of BOTH knobs simultaneously will some times inhibit operation of the touch sensing system The knob touch system overrides any KEY type command so that KEY commands will not transmit if you are accidentally touching either knob The transmission of analog control positions to the preamplifier works much like the process
13. r MM capacitors and for MC resistors 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 result in deceptively normaloutput levels but with improper cartridge frequency response uC RES STOR AA CAPACITOR AC RESISTOR AA CAPACITOR Heflec IRIS init ibo o o ooo O Qs IRIS WITH COVER REMOVED SHOWING LOCATION OF OPTIONAL CARTRIDGE LOADING PLUG INS IRIS SPECIFICATIONS Phono Section Frequency Response Maximum Output Voltage Totul Harmonic Distortion amp Noise Sensitivity Signal to Noise Ratio Maximum Input Signal Input Impedance Gain LINE SECTION Frequency Response Bandwidth Maximum Output Voltage Measurements at REC OUT 20Hz 20kHz 01 dB 5 Volts 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 V RMS A weighted relative to 0 5 V RMS Moving Magnet 87dB Moving Coil BOdB 1kHz Moving Magnet 65 mV RMS Moving Coil 6 5 mV RMS Nominal 4
14. r operate this switch either way unless the VOLUME control is turned full down as the very high gain present can result in switching transients able to blow fuses in amplifiers or loudspeakers or damage some types of loudspeakers High Level Inputs Oval Key selected Main Outputs and Mono switch The usual ground thumbscrew is provided for turntable frame grounding via the extra ground wire provided on most turn tables IRIS has seven pairs of main HIGH LEVEL inputs selected by the seven oval KEYS to the right of the phono KEY All of these inputs proceed at unity gain to the attenuator line amplifier system which has a maximum gain of 20dB All of these basically identical inputs are selectable by the input KEY switches The KEY switches activate a digital system which effects audio signal selection by FET switches followed by matched J FET buffers Excepting phono all input impedances for the entire preampli ier are in the 15 28k ohms range 0 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 MAIN output jacks are used to feed the power amplifier Their low output impedance of 316 ohms allows driving long cables if necessary The MONO switch effects a passive combining of the stereo channels into monaural fed through the attenuator system to both line amplifiers Although rarely used today this switch is provide
15. selection The CLR CLeaR KEY allows you to return to normal preamplifier input selection A STEADY flashing of the MUTE LED tells you that automatic command out routing is in effect If RECORD SECURITY is also ineffect the INTERRUPTED flashing will override the STEADY flashing 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 above by KEYing SX and following with any sequence of the top 8 KEYS depressed within 3 second intervals All IRIS compatible accessories will also have a similar syn chronously flashing indicator showing when they are RE SPONDING to out routed commands The RED Completed Frame indicator on the transmitter is arranged to grow dimmer rapidly when batteries are approach ing end of life Even though the remote will still work its range will be less and corrosion could begin to set in if this condition is left too long Replacement batteries 4 AA type preferably Alkaline OPTIONAL 1 Remove the 4 screws on the bottom cover of the transmitter and pull the cover off 2 The battery polarities are clearly marked in the plastic holder visible when the b
16. tain Standard time at 602 967 3565 Before returning any unit to the factory for service please call us All units being returned regardless of warranty status must receive a Retum Authorization RA Number In addition we can offer trouble shooting assistance that may often simplify or even 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 lt is the owners 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 Sale Use the original carton and all packing material and be sure to include a return address and a brief description of the difficulty including whether it is intermittent This warranty gives you specific legal rights You may also have other rights which vary from state to state
17. 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 causes the MUTE light to illuminate and the preamp to fade down approximately 20dB This mode is used for phono cueing and at any other convenient time such as answering a phone etc Depressing the NORMa KEY restores normal level The two key format is used so that you always know whether you are muting or de muting The level control system in IRIS is unusual and uniquely suited to our goal of combining superb sound with high convenience It is an indirect type in which no audio signals are passed through the panel controls 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 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 3dB4o 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
18. used in digital recording and playback Duringeachof these 1 8 second transmission frames the transmitter takes an Analog to Digital A D conversion of the BALANCE knob position transmits it twice in different forms then takes an A D conversion of the VOLUME knob position and similarly transmits it then flashes the RED Completed Frame LED at the top of the remote transmitter During the same 1 8 second the receiver carefully checks the incoming BALANCE code format loads the BALANCE data into a temporary storage register then carefully checks the VOLUME code format and if BOTH pass ALL checks finally sends both data sets to Digital to Analog D A conversion overriding the analog DC Voltages of the preamplifiers 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 knobs At preamplifier power up V B control always reverse to the preamplifiers knobs because the unpowered preamplifierdoes not remember previously entered remote data The green panel V B LED lights indicating this PANEL V B mode This indicator is also used in a bright FLASHING mode to indicate each new arrival of valid V B data from the remote The preamplifier automatically transfers to the V B settings of th
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