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HHB comm CIRCLE STUDIO MONITORS User's Manual
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1. OPERATING INSTRUCTIONS v Z O gt 9 I v LL m 5 5 INTRODUCTION A Oe de A wee Wale 4 PRECAUTIONS es aa UU BOO BONO are me 5 SERVICE 150632728 dk DEOS ode da ee ee ao Jb id e a a Rd ee ode ee eee 5 CIRCLE 6 Key features passive and 6 Key features active ONLY ei see RR ee RC RE UR OS ee ee ee ew RE 6 Active Circle 5 rear 1 5 5 REOR a ee ee 7 Passive Circle 5 rear panel fig 2 7 CIRCLE a e Eg dita 8 Key features passive and 8 Key features active Oniy cick E eo de e EE LECTURE CERES SERS 8 Active Circle 3 rear panel fig 3 ee ew CUR 9 Passive Circle 3 rear panel fig 4 SESS HES 9 CIRCLE T ees a neri kora ae Sea Gr ae CR EUR TR LUE M UR RUE eae 10 Key features active a xo LE o eC LE CU E ARE REE RES E 10 Active Circle 1 sub woofer rear panel fig 5 11 LOUDSPEAKER CONNECTION eae eee ee eae ee a ea ane ee 12 Circle 5 anda Circle 12 Circle 5 and Circle 3 RRA
2. The HHB Circles are a true family in every sense both in character and appearance Great consistency in their design and manufacture has resulted in a distinctive Circle sound uniformly matched across the entire range enabling Circle 3s and 5s to be freely combined in any surround setup without detrimental effect to the reproduced sound Striking purple cones or grilles and a durable black paint finish on all models further strengthen the family resemblance With their high quality audio components and low distortion filters the HHB Circle studio monitors are full of features The cone on the Circle 5 15 formed from an injection moulded polymer with varying thickness across its diameter for a grain free texture and minimal cone distortion And with controls for master volume on the active Circle 3 and 5 along with mode switching input sensitivity LF boost and phase controls on the Circle 1 all Circle monitors are fully adaptable for every studio or project installation Whether you possess a stereo pair of loudspeakers or an entire surround sound system the HHB Circle studio monitors are simple to set up and simple to use With their many flexible options they offer a tailor made solution for any monitoring application These operating instructions for the Circle monitors explain the fundamentals of loudspeaker connection and positioning providing clear and simple information for monitor installation whatever your requireme
3. Q Sallen and Key active filters eliminate mid band peaks resulting in a sound that doesn t tire the listener even after long periods Long life smoothing capacitors Massive heat sink for effective heat dissipation Active Circle 5 Rear Panel MASTER VOLUME UNBALANCED PHONO IN UNBALANCED PHONO INPUT BALANCED XLR INPUT ELECTRONICALLY BALANCED INPUT 1 SCREEN 2 HOT 3 COLD 120W LF 70W HF POWER AMPLIFIERS ULTRA PRECISION ACTIVE FILTERS HIGH PASS FILTER LED TRIPCHIP POWER AMP gt INPUT IC POWER AMP LOW PASS FILTER CAUTION Risk of electric shock DO NOT OPEN ATTENTION Risque de choc electrique NE PAS OUVRIR B ACHTUNG Vor dem Offnen des Ger tes Netzstecker ziehen COMMUNICATIONS MANUFACTURED IN THE UK LONDON LOS ANGELES TORONTO SERIAL NO OPERATING VOLTAGE THIS EQUIPMENT MUST BE EARTHED NO USER SERVICEABLE PARTS INDOOR USE ONLY Passive Circle 5 Rear Panel ab HHB COMMUNICATIONS e MANUFACTURED IN THE UK LONDON LOS ANGELES TORONTO TE Reres IMPEDANCE SERIAL NO 8 OHMS The compact size of the HHB Circle 3 studio monitor is ideal when space is at a premium Equally at home in project or commercial studios the Circle 3 features a 4 5 paper pulp cone optimised for use in the smaller cabinet An anti magnet screen allows the Circle 3 to be placed next to computer or video monitors The C
4. RE RRR Dee 12 Circle 1 active SUD WOOTGT C E al Pe CC CR d CC Roe 12 5 1 mode method 1 fig 6 2 22 52555545554 GE NUR IER ATE LA 13 5 1 mode metnod 2 fid 7 5 5 13 B mode 18 9 Ju uoa a n Rech de CREE a CR DR e DR DE e EE SR at an 13 C mode eee ae eee eee ae eee ae Blea epee RO elena er eee 13 LOUDSPEAKER POSITIONING alata Sa aa Re 14 Stereo loudspeaker placement 14 Suggested stereo loudspeaker placement fig 10 14 Surround loudspeaker placement 15 Suggested surround speaker placement fig 11 15 TECHNICAL DATA ate ee 16 HHB Circle studio monitors are designed and built with HHB s customary attention to detail More than 20 years experience and a number of unique Innovations have combined to produce studio monitors capable of performing in the most demanding professional environments The Circle 5 and Circle 3 available in both active and passive versions together with the Circle 1 sub woofer are perfect for use in a variety of stereo and surround sound professional monitoring applications Extremely responsive they deliver every performance with power and clarity
5. fed to the sub woofer The rest of the frequency spectrum from these inputs is output from the left and right or left centre and right XLRs as normal for connection to Circle 3 or Circle 5 speakers This mode allows optimum flexibility with both stereo and LCR source formats OUTPUT FROM INPUT TO DECODER MIXER LOUDSPEAKERS L C R LS RS Optional With the HHB Circle 1 in C mode the bass frequencies are filtered from the left centre and right inputs and summed together with the signal from the SUB input either XLR or RCA phono This method of connection ensures that any dedicated sub bass mix is always reproduced by the Circle 1 C mode OUTPUT FROM INPUT TO DECODER MIXER LOUDSPEAKERS E R pb LS pen RS Optional The three controls on the HHB Circle 1 allow simple configuration for each particular surround setup An input sensitivity level adjusts the volume of the sub woofer without affecting any of the other signals that may be passing through the filter stages of the unit The bass boost control provides approximately 10dB of boost in a half octave centred at 33Hz The function of this is to compensate for the frequency response of the human ear when listening at low levels The boost control should be normally be set near minimum when listening at mid to high levels but the boost level may be increased as the listening level is reduced Please note that the HHB Ci
6. for a few hours before critical listening is attempted BEWARE HHB Circle studio monitors are capable of producing high sound pressure levels Be careful not to monitor at high volumes for long periods as this could cause hearing damage S hould a HHB Circle monitor require service it must be taken or sent to an HHB authorised dealer Please retain the original packing for possible future use and ensure the unit is suitably protected during transit The manufacturer cannot accept responsibility for damage caused during transportation In order to register ownership it is essential that you complete and return the user registration card supplied with this product All Please record the following details Date purchased Deler oedrannau a Eer INN Ee components used in HHB Circle studio monitors are guaranteed against faulty materials or workmanship for a period of one year from the date of purchase This warranty will become void if the product has been misused modified or tampered with in any way HHB shall not be liable for any consequential or incidental damages due to the failure of this product In the unlikely event of a product failure please contact your local dealer As part of a complete monitoring system HHB Circle 5 studio monitors will deliver the clean highly accurate sound required Their reliable sound output and wide flat frequency response makes them suitable for the highest
7. the response at the crossover frequency will be less accurate Both speakers should be the same distance from the listening position The Circle 5 and Circle 3 loudspeakers should be slightly angled in towards each other so as to point towards the listening position and placed at a height where the listener s ears are level with the tweeters Ideally the two loudspeakers and the listener should sit at the corners of a triangle where all sides are of equal length The listener should not sit too close to the speakers i e within this imaginary triangle since the important centre image Sweet spot can be greatly affected when listening in this position Suggested stereo loudspeaker placement Loudspeakers Listener 14 The loudspeakers should be placed away from corners and walls more than one metre away approximately three feet is ideal since there may be unwanted interference patterns caused by the reflections of the signal from the walls which will colour the low and mid frequencies giving the impression of extreme bass warmth and unnatural midrange At these low frequencies the sound from the loudspeakers radiates in all directions and reflects off any hard surfaces to combine with the direct sound At higher frequencies sound from the loudspeakers is more directional causing less of a problem with interference Avoid placing the Circle 5 or Circle 3 studio monitors on top of a mixing co
8. Active Crossover Crossover point at 2 6kHz Sallen amp Key active filters for LF and HF Advanced design using ultra high precision components Low noise audio ICs and 1 precision resistors used throughout ee ee LF unit driven by twin power ICs in Push Pull mode HF unit driven by a single IC Anti thump on off circuitry Regulated low noise low distortion power supply with long life Capacitors guaranteeing full power over a long service life Polyswitch tweeter overload protection with LED indicator Every module calibrated against reference for perfect stereo imaging CONMGCIONS P Switchable XLR RCA phono Main Input European model 220 240V 50Hz U S Canadian model 110 120V 60Hz Dimensions HXWxD 420mm x 255mm x 300mm 16 5 x 10 0 x 11 8 Weight 12 6kg 27 7105 each net 25 6kg 56 3105 packed in pairs gross Both active and passive Circle 5s are packaged in pairs Single units can also be ordered Power Amplifier Term Active bandpass twin chamber reflex sub woofer LF 300mm 12 double magnet contour optimised cone with high compliance long throw rubber surround rigid magnesium chassis Low moving mass for fast transient attack Air cooled magnet system 40mm 1 6 diameter aluminium voice coil Frequency Response Sensitivity For Full Output input sensitivity at max sub woofer effects channel Controls Active Crossover 5 main ch
9. INPUT 21215 NE PAS OUVRIR CAUTION Risk of electric shock DO NOT OPEN ATTENTION Risque de choc electrique ACHTUNG Vor dem Offnen des Ger tes Netzstecker ziehen 11 HHB COMMUNICATIONS MANUFACTURED IN THE UK LONDON LOS ANGELES TORONTO OPERATING VOLTAGE THIS EQUIPMENT MUST BE EARTHED NO USER SERVICEABLE PARTS FUSE F1 0A 110 117V 50Hz INDOOR USE ONLY F630mA 230V 50Hz 4 Passive Circle 3 Rear Panel HHB COMMUNICATIONS MANUFACTURED IN THE UK LONDON LOS ANGELES e TORONTO SERIAL NO IMPEDANCE 8 OHMS The Circle 1 active sub woofer is the perfect loudspeaker to complement the Circle 5 and Circle 3 in surround sound applications Faithfully reproducing all the low frequency effects found in films and music the HHB Circle 1 greatly improves the bandwidth of loudspeaker systems With its built in active crossover any combination of up to five full range loudspeakers depending on the application may be connected to the Circle 1 allowing its on board filters to remove extreme low frequency content from the other signals preventing their overload whilst attempting to reproduce these high energy frequencies W ith this arrangement no additional filtering is needed Dedicated sub woofer signals may be sent directly from a mixing console or multitrack recorder to the Circle 1 5 1 mode or the internal circuitry can extract the low
10. annels pass through Sallen amp Key filters crossover point at 120Hz and are available in XLR outputs Advanced design using ultra high precision components 33Hz 120Hz 3dB in free space 1V RMS Input sensitivity LF boost phase Low noise audio semiconductors and 196 precision resistors used throughout audio circuitry Power Connectors Main Input Voltage DIMENSIONS HXW XD 2 CENTER cu Weih T eae eae Gee ee Rees 160W min programme Anti thump on off circuitry Regulated low noise low distortion power supply with long life capacitors guaranteeing full power over a long service life a bees eden ede eawee d EE XLR inputs female L C R L rear R rear XLR female and RCA phono Sub woofer effects channel XLR outputs male L L rear rear all band limited to 120Hz to connect to satellite speakers TTE European model 220 240V 50Hz U S Canadian model 110 120V 60Hz rrr 465mm x 414mm x 414mm 18 3 x 16 3 x 16 3 21 5kg 47 3lbs each net 27 0kg 59 4105 packed in singles gross Durable black paint finish with perforated purple grille Dealer Stamp FIRST WE LISTEN www hhb co uk HHB Communications Ltd 73 75 Scrubs Lane London NW 10 600 UK Tel 020 8962 5000 Fax 020 8962 5050 E Mail sa
11. erminal on the loudspeaker is connected to the positive red terminal on the amplifier and that the negative black terminal on the speaker is connected to the negative black terminal on the amplifier Connecting one of the loudspeakers out of phase will result in dramatic loss of low frequency signals and an incoherent spatial image Always use good quality medium or heavy duty speaker cable not thin bell wire The main function of a speaker cable is to transfer the maximum amount of current with the minimum amount of distortion It is therefore preferable to have a cable with a wide cross sectional area since this will reduce the electrical resistance If the cable is too thin the resistance rises and heating may occur Where possible try to use the same length of cable for each speaker Circle 5 amp Circle 3 Active Audio connection to the active HHB Circle 5 and Circle 3 is via balanced XLR or unbalanced RCA phono A switch selects the desired audio input The active Circle 5 and 3 should be connected to a suitable mains power supply via an IEC connector Power should be switched off when connecting or disconnecting any signal to or from the loudspeakers or when changing the position of the selector switch since the loudspeakers and internal amplifiers may be damaged When audio cable runs are long about ten metres or more approximately thirty feet or there is electromagnetic interference in the vicinity
12. frequency information from the left centre and right input signals B mode In C mode low frequency information is filtered from the left centre and right input signals and added to the sub woofer signal ensuring optimum low frequency performance The Circle 1 s paper pulp 12 LF driver is mounted at the top of the cabinet displacing air out of the acoustically optimised front port Designed for use as an integral part of any surround sound monitoring system Increases the bandwidth of a loudspeaker system down to 33Hz Exceptionally low colouration and distortion 300mm 12 paper pulp bass mid driver Low moving mass for fine transient response characteristics Air cooled magnet system Very large voice coil and long throw suspension Flexible configuration possibilities with direct Input of sub woofer signal 5 1 mode or low frequency information extracted from the left centre and right signal paths and fed internally B mode or summed C mode to the sub woofer input within the Circle 1 Balanced XLR and unbalanced RCA phono sub woofer input 10 Built in 5 channel Sallen and Key active filters remove the need for external filtering Low noise low distortion power supply with long life smoothing capacitors Variable phase control allows blending with existing speaker room combinations Variable bass boost control achieves optimum bass balance across a range of differing listening levels lower
13. ibreglass PCB critically damped 3 5 kHz crossover ons EC ee eee ewe ess ney ee eae ees Binding posts Dimensions HxWxD 270mm x 175mm x 197mm 10 6 x 6 9 x 7 8 Weight 3 7kg 8 1105 each net 8 4kg 18 5165 packed in pairs gross ide are a ehe KS Y ace cec Go Mg ce Durable black paint finish Circle 5 Passive Transducer System Ported 2 way monitor loudspeaker Drive UNITS ie ato ba RAPERE LF Custom 200mm 8 polymer cone high compliance long throw rubber surround 25mm 1 high temperature aluminium voice coil and antimagnet HF Custom 28mm 1 1 ferro fluid cooled soft dome with rear damping chamber 28mm 1 1 high temperature aluminium voice coil and antimagnet Frequency Response iu suce dax 48Hz 20kHz 3dB Sensitivity 870 1W 1m Suggested Amplifier Power EE 50 200W te sira miri bok E I TOT DOTT 8 Ohms nominal Power Handling Programme 120W CrOSSOVEl Li esa sc aO Pro grade components on fibreglass PCB critically damped 2 6kHz crossover COMICCIONS Binding posts Dimensions HxWxD 420mm x 255mm x 300mm 16 5 x 10 0 x 11 8 Weight 10 0kg 22 0105 each net 20 4kg 44 9lbs packed in pairs gross FINS DR ECT Durable black paint finish Ci
14. ircle 3 monitors can be used as part of a surround sound system since passive or active they produce a sound which is both clear and dynamic the HHB house sound Active amp Passive High quality sound reproduction a compact package Ideal for smaller mixing applications Acoustically dead chassis e Accurate bass treble driver time alignment 110mm 4 5 non resonant suspension coupling bass mid driver with a paper pulp cone optimised for smooth accurate sound reproduction with minimum distortion Individually tested ferro fluid cooled soft dome tweeter Magnetically screened for use close to video computer monitors Rigid seamless cabinet finished in durable black paint Active Only 60W LF 60W HF integral amplifier pack S witchable inputs either balanced XLR or unbalanced RCA phono Power amplifier contains anti thump on off circuitry Anti resonant amplifier mounting Low noise audio integrated circuits Advanced surface mount computer assembled PCB construction Toroidal transformer for added headroom and low hum field Individually calibrated Sallen and Key active filters Controlled crossover characteristics to eliminate listening fatigue during long recording or mixing sessions Active Circle 3 Rear Panel MASTER VOLUME ELECTRONICALLY BALANCED UNBALANCED INPUT PHONO IN 1 SCREEN 2 HOT 3 COLD BALANCED XLR INPUT UNBALANCED PHONO
15. les hhb co uk HHB Communications USA LLC 1410 Centinela Avenue Los Angeles CA 90025 2501 USA Tel 310 319 1111 Fax 310 319 1311 EMail sales hhbusa com HHB Communications Canada Ltd 260 King Street East Toronto Ontario M5A 415 Canada Tel 416 867 9000 Fax 416 867 1080 E Mail sales hhbcanada com
16. listening levels require bass boost according to psychoacoustic theory Input sensitivity control allows matching of sound balance across the whole surround monitor system Built in temperature overload sensor Rigid ported cabinet finished in durable black paint Distinctive purple grille Active Circle 1 Sub Woofer Rear Panel TT Gg CAUTION Risk of electric shock DO NOT OPEN ATTENTION Risque de choc electrique NE PAS OUVRIR ACHTUNG Vor dem Offnen des Ger tes Netzstecker ziehen Ab INPUT SENSITIVITY LF BOOST PHASE COMMUNICATIONS e MANUFACTURED IN THE UK 90 LONDON LOS ANGELES TORONTO 4 6 4 6 SERIAL NO 2 8 2 8 OPERATING 0 10 0 10 0 180 VOLTAGE MAX MIN MAX THIS EQUIPMENT MUST BE EARTHED NO USER SERVICEABLE PARTS INDOOR USE ONLY B MODE OFF 0 ON 5 1 MODE MODE REAR LEFT REAR RIGHT rx FRONT LEFT FRONT CENTRE FRONT RIGHT FRONT LEFT FRONT CENTRE FRONT RIGHT INPUTS OUTPUTS 11 LC DSP 91 TION Circle 5 amp Circle 3 Passive Choosing an amplifier to match your speakers and application is important The passive HHB Circle 5 requires connection to a power amplifier with a suggested output between 50 and 200 Watts RMS and the Circle 3 should be powered by an amplifier with an output of 30 to 100 Watts Connection is made via a pair of binding posts on the rear of the loudspeaker Take care to ensure that the positive red t
17. loor or slightly to one side of the listening position without altering the overall spatial image Distance from the listening position to each of the loudspeakers should always be the same If the listener is at the centre point of an imaginary circle the speakers should all lie on the circle s circumference There are no hard and fast rules as to the exact placing of the left and right surround loudspeakers this circular diagram is merely intended as a guide In fact many recording and mixing studios have their surround loudspeakers mounted on moveable trolleys enabling each client to place them in their preferred position 15 TE Circle 3 Passive Transducer System 2 way monitor loudspeaker HEIEREN LF Custom 110mm 4 5 NRSC cone 25mm 1 voice coil high linearity low loss suspension rigid self sealing polymer chassis and shielding antimagnet HF 25mm 1 ferro fluid cooled soft dome high efficiency Neodymium magnet highly focused magnetic field 25mm 1 aluminium voice coil Frequency Response 70Hz 20kHz 30 SENSITIV 83dB 1W 1m Suggested Amplifier Power 30 100W Impedance or aai ER Bahk dk 8 Ohms nominal Power Handling Programme cias arx e Cr ger x n ge EO em ERR RC 60W CIDSSOUBI 2 das dred ua aep Pro grade components on f
18. nsole since this will adversely affect the frequency response Some of the sound output will reflect off the surface of the console interfering with the direct sound from the loudspeakers Instead position the speakers on stands slightly behind and above the console SURFOUbSPEAKER PLACEMENT The loudspeaker arrangement for surround sound monitoring may comprise three front channels and two surround channels each placed upright on stands an equal distance from the listening position A sub woofer is often used to improve the system s low frequency response A typical setup may consist of five HHB Circle 5 loudspeakers with a Circle 1 sub woofer Ensure that all five loudspeakers are positioned at the same height ideally this will be so that the tweeters are level with the listener s ears Due to the consistent sound quality of the HHB Circles it is possible to mix Circle 5s and Circle 3s in the same surround setup The front three speakers left centre and right may be Circle 5s with a pair of Circle 3s used for left surround and right surround e Widely used in films and pop music extreme low frequency effects as produced by the HHB Circle 1 are often felt rather than actually heard Suggested surround loudspeaker placement Since the Circle 1 sub woofer will only produce low frequencies often with a wavelength of up to ten metres it is often hard to localise enabling the speaker to be placed on the f
19. nts The active HHB Circle loudspeakers are simple to install but like all electrical equipment care must be taken to ensure reliable safe operation The following points should always be observed This equipment must be earthed In a situation using multiple speakers the mains power should be derived from a central set of outlets that have a solid ground connection Should a problem exist with hum loops the ground connections on the XLR input connectors should be disconnected not the mains earth connection The mains earth connection must NEVER be removed from these speakers Ensure the speakers are the correct voltage for the available mains supply All mains wiring should be installed and checked by a qualified electrician To prevent fire or electric shock hazard do not operate this equipment outside or expose to rain or moisture Do not operate when disassembled or if the cabinet is damaged exposing the internal electronics When replacing the fuse in the active Circle 5 Circle 3 and Circle 1 use only the correct rating of fuse a 2A slow blow type for the Circle 5A and Circle 1A or a 630mA slow blow type for the Circle 3A The fuses used must conform to local safety regulations As the performance of a new loudspeaker will improve after the first few hours of use due to the bedding in of the cone materials and suspensions it is recommended that new speakers should be driven at a moderate level
20. of the cable from a motor for instance it is advisable to use balanced XLR cables so as to avoid any induced noise The master volume control on the active Circle 5 and 3 acts as a Sensitivity control When at its highest the input is at maximum sensitivity and the amplifiers will be fully driven by an input of 1V The best way to set this correctly is to ensure that the monitor output of the mixing desk or other equipment that is driving the speakers is set to produce a peak output of 1V The master volume control also allows for balancing between loudspeakers ideal for use in a surround sound environment 12 Circle 1 Active Sub Woofer The HHB Circle 1 is an active sub woofer containing built in amplification and active crossover circuitry designed especially for use with Circle 5 and Circle 3 loudspeakers in a surround sound setup Its flexible input and output capabilities allow quick and simple connection to the other loudspeakers The HHB Circle 1 sub woofer has three distinct modes of operation set by a switch on the rear panel these modes are 5 1 B and C The system is designed for decoded or discreet 5 1 reproduction but also caters for earlier formats of surround sound or bass enhancement in a conventional stereo system Using the HHB Circle 1 in 5 1 mode there are two connection methods in a surround sound system With method 1 the separate sub input allows direct connection from a dedica
21. quality audio monitoring applications The Circle 5s feature a solid state Polyswitch to protect the tweeter from excessive input Unlike other protection circuits which limit power to the tweeter affecting the overall balance of the sound in a way which may not be immediately obvious to the listener the Polyswitch the Circle 5 cuts all power to the tweeter and illuminates a red warning LED After a couple of minutes to cool off the switch automatically resets having saved the tweeter from overload and subsequent damage Active amp Passive Detailed accurate and dynamic sound both on and off axis Tight controlled low end performance e Accurate bass treble driver time alignment 200mm 8 bass mid driver with a unique injection moulded cone for increased dynamics and minimal bass colouration Individually tested ferro fluid cooled soft dome tweeter Solid state Polyswitch tweeter overload protection Shielding antimagnets allow use close to video and computer monitors Rigid seamless ported cabinet finished durable black paint Active Only 120W LF 70W HF integral amplifier pack Switchable inputs either balanced XLR or unbalanced RCA phono Push Pull amplifier design for tight controlled low end performance Power amplifier contains anti thump on off circuitry Extra large toroidal transformer for added headroom and low hum field Individually calibrated low
22. rcle 1 Powered Sub Woofer System s acia sura cuc de d edis BA NS ohn Ow ee Circle 3 Active As passive but with the addition of an internal power amplifier Sensitivity For Full Output with Input sensitivity control at max 1V RMS Power 60W Bass 30W Tweeter Active ChOSSOUEl s assa Crossover point at 3 5 2 Sallen amp Key active filters for LF and HF Advanced design using ultra high precision components Low noise audio semiconductors and 1 precision resistors throughout audio circuitry Power Anti thump on off circuitry Regulated low noise and distortion power supply CONNECTOTS ecra OX dr Slide Switchable XLR female or RCA phono Main Input European model 220 240V 50Hz U S Canadian model 110 120V 60Hz Dimensions HXWxD 270mm x 175mm x 220mm 10 6 x 6 9 x 8 7 Weight 5 0kg 11 0lbs each net 11 0kg 24 2105 packed in pairs gross Both active and passive Circle 3s are packaged in pairs Single units can also be ordered Circle 5 Active As passive but with the addition of an internal power amplifier Sensitivity For Full Output d ike ee wake KA eee CR 1V RMS Power Programme as vo 140W Bass 70 Tweeter
23. rcle 1 is not designed to be used at full boost and very high level Some user adjustment is required to obtain the optimum balance between the preferred sound and power handling power capacity of the system The phase control is provided to enable smooth integration of the Circle 1 with other loudspeakers in the surround system this control alters the phase of the sub woofer signal through 180 enabling the sub woofer to blend with the other loudspeakers in the system whatever your monitoring requirements The phase control should be adjusted to obtain the best smoothest balance between the deep mid and upper bass along with the mid and high frequencies in the Circle surround system with the entire system installed and in the correct positions 13 D Whether you have a stereo or surround sound system correct positioning of loudspeakers in the room is essential as this will greatly affect the accuracy of the reproduced sound Speakers radiate sound from all directions and therefore placing them against walls or on the floor is not advisable HHB Circle 5 and Circle 3 monitors are optimised for use under free field conditions so for the best results consider the following points when setting up your loudspeaker system S TE R UBSPEAKER PLACEMENT The Circle 5 and Circle 3 loudspeakers should be placed upright on stands away from boundaries to reduce reflections Do not place them on their sides as
24. ted line level low frequency effects or sub channel on a surround sound decoder mixing desk or a multitrack recorder Using this method only one physical connection is made to the sub woofer the other five loudspeakers are sent their own discrete Signals directly from the mixing desk etc 5 1 mode method 1 OUTPUT FROM INPUT TO DECODER MIXER LOUDSPEAKERS Circle 1 In the second connection method 2 all the monitor signal outputs normally left centre right left surround and right surround are connected to the inputs on the HHB Circle 1 and the outputs are fed to the loudspeakers This method filters the low frequencies below 120Hz from the loudspeaker feeds The sub woofer is always driven from the SUB input it receives no low frequency information from the other five inputs This connection method is widely used since by removing the extreme low frequencies the five full range loudspeakers can be utilized more efficiently This method of signal connection makes the most of the Circle 1 s high quality filters ei 5 1 mode method 2 OUTPUT FROM INPUT TO DE ODER MIXER LOUDSPEAKERS Using the HHB Circle 1 in B mode the bass frequencies are extracted from the left centre and right inputs and not from the SUB input The left and right monitor signals or left centre and right are connected to the XLR inputs and the bass below 120 Hz is filtered from these signals equally mixed together and
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