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HHB Communications Ltd · 73-75 Scrubs Lane, London NW10 6QU, UK  
Tel: 0181 962 5000 · Fax: 0181 962 5050 · E-Mail: [email protected]

HHB Communications USA LLC · 1410 Centinela Avenue, Los Angeles, CA 90025-2501, USA  
Tel: 310 319 1111 · Fax: 310 319 1311 · E-Mail: [email protected]

HHB Communications Canada Ltd · 260 King Street East, Toronto, Ontario M5A 4L5, Canada  
Tel: 416 867 9000 · Fax: 416 867 1080 · E-Mail: [email protected]

Visit HHB on-line at: http://www.hhb.co.uk 

Trademarks are the property of their respective owners.

TECHNICAL DATA

Circle 3 Passive

Transducer System  . . . . . . . . . . . . . . . . . . . . . . . . 2 way monitor loudspeaker.
Drive Units  . . . . . . . . . . . . . . . . . . . . . . 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 +/-3dB. 
Sensitivity  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 83dB 1W/1m.
Suggested Amplifier Power  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30 - 100W.
Impedance  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 Ohms nominal.
Power Handling (Programme)  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60W.
Crossover  . . . . . . . . . . . . . . . . . . . . Pro-grade components on fibreglass PCB, 

critically damped, 3.5kHz crossover.

Connectors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Binding posts.
Dimensions (HxWxD)  . . . . . . 270mm x 175mm x 197mm / 10.6" x 6.9" x 7.8".
Weight . . . . 3.7kg (8.1lbs) each (net), 8.4kg (18.5lbs) packed in pairs (gross).
Finish  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Durable black paint finish.

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 (Programme) . . . . . . . . . . . . . . . . . . . . . . . . . . 60W bass, 30W tweeter.
Active Crossover  . . . . . . . . . . . . . . . . . . . . . . . . . . . Crossover point at 3.5kHz. 

Sallen & 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 Amplifier  . . . . . . . . . . . . . . . . . . . . . . . . . . . Anti thump on/off circuitry.

Regulated low noise and distortion power supply.

Connectors  . . . . . . . . . . . . . . . . Slide switchable XLR (female) or RCA phono.
Main Input Voltage  . . . . . . . . . . . . . . . . . . . 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 (24.2lbs) packed in pairs (gross).

Circle 5 Passive

Transducer System   . . . . . . . . . . . . . . . . . . Ported 2 way monitor loudspeaker.
Drive Units  . . . . . . . . . . . . . . . . . . . . . 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 . . . . . . . . . . . . . . . . . . . . . . . . . . . 48Hz - 20kHz, +/- 3dB. 
Sensitivity  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 87dB 1W/1m.
Suggested Amplifier Power  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50 - 200W.
Impedance  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 Ohms nominal.
Power Handling (Programme)  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 120W.
Crossover  . . . . . . . . . . . . . . . . . . . . Pro-grade components on fibreglass PCB, 

critically damped, 2.6kHz crossover.

Connectors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Binding posts.
Dimensions (HxWxD)  . . . . 420mm x 255mm x 300mm / 16.5" x 10.0" x 11.8".
Weight  . 10.0kg (22.0lbs) each (net), 20.4kg (44.9lbs) packed in pairs (gross).
Finish  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Durable black paint finish.

Circle 5 Active

As passive, but with the addition of an internal power amplifier.

Sensitivity For Full Output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1V RMS.
Power (Programme) . . . . . . . . . . . . . . . . . . . . . . . . . 140W bass, 70W tweeter.
Active Crossover . . Crossover point at 2.6kHz. Sallen & Key active filters for LF

and HF. Advanced design using ultra high precision components.

Low noise audio ICs and 1% precision resistors used throughout.

Power Amplifier  . . . . . . . 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.

Connectors  . . . . . . . . . . . . . . . . . . . . . . . . . . . . Switchable XLR / RCA phono.
Main Input Voltage  . . . . . . . . . . . . . . . . . . . European model: 220-240V, 50Hz.

U.S. / Canadian model: 110-120V, 60Hz.

Weight . 12.6kg (27.7lbs) each (net), 25.6kg (56.3lbs) packed in pairs (gross).

Circle 1 Powered Sub-Woofer

Transducer System  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Active bandpass twin chamber reflex sub-woofer.
Drive Units  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 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  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33Hz - 120Hz,+/- 3dB in free space.
Sensitivity For Full Output, input sensitivity at max, sub woofer (effects) channel:  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1V RMS.
Controls  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Input sensitivity, LF boost, phase.
Active Crossover  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 main channels pass through Sallen & Key filters, crossover point at 120Hz, and

are available in XLR outputs. Advanced design using ultra high precision components. 

Low noise audio semiconductors and 1% precision resistors used throughout audio circuitry.

Power Amplifier  . . . . . . . . . . . . . 100W 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.

Connectors  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . XLR inputs (female): L, C, R, L rear, R rear, Sub-woofer (effects channel)

XLR outputs (male) L, C, R, L rear, R rear,

all band limited to 120Hz to connect to ‘satellite’ speakers.

Main Input Voltage  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . European model: 220-240V, 50Hz. U.S. / Canadian model: 110-120V, 60Hz.
Dimensions (HxWxD)  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 465mm x 414mm x 414mm / 18.3" x 16.3" x 16.3".
Weight . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21.5kg (47.3lbs) each (net), 27.0kg (59.4lbs) packed in singles.
Finish  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Durable black paint finish with perforated purple grille.

interstage

Phistersvej 31, 2900 Hellerup, Danmark

Telefon 3946 0000, fax 3946 0040

www.interstage.dk

-

 pro audio with a smile

Summary of Contents for Circle 1

Page 1: ...STUDIO MONITORS CIRCLE SERIES Operating Instructions interstage Phistersvej 31 2900 Hellerup Danmark Telefon 3946 0000 fax 3946 0040 www interstage dk pro audio with a smile...

Page 2: ...2...

Page 3: ...Circle 3 rear panel fig 4 9 CIRCLE 1 10 Key features active 10 Active Circle 1 sub woofer rear panel fig 5 11 LOUDSPEAKER CONNECTION 12 Circle 5 and Circle 3 active 12 Circle 5 and Circle 3 passive 12...

Page 4: ...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 mon...

Page 5: ...akers 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 shoul...

Page 6: ...h on and off axis Tight controlled low end performance Accurate bass treble driver time alignment 200mm 8 bass mid driver with a unique injection moulded cone for increased dynamics and minimal bass c...

Page 7: ...Figure 1 Active Circle 5 Rear Panel Figure 2 Passive Circle 5 Rear Panel MIN MAX 0 2 10 4 6 8 7...

Page 8: ...t 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...

Page 9: ...Figure 3 Active Circle 3 Rear Panel Figure 4 Passive Circle 3 Rear Panel 9...

Page 10: ...Circle 1 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...

Page 11: ...11 Figure 5 Active Circle 1 Sub Woofer Rear Panel...

Page 12: ...ff 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...

Page 13: ...ity with both stereo and LCR source formats Figure 8 B mode switch in B position The three controls on the HHB Circle 1 allow simple configuration for each particular surround setup An input sensitivi...

Page 14: ...ngle 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 wh...

Page 15: ...in films and pop music extreme low frequency effects as produced by the HHB Circle 1 are often felt rather than actually heard Since the Circle 1 sub woofer will only produce low frequencies often wit...

Page 16: ...mme 120W Crossover Pro grade components on fibreglass PCB critically damped 2 6kHz crossover Connectors Binding posts Dimensions HxWxD 420mm x 255mm x 300mm 16 5 x 10 0 x 11 8 Weight 10 0kg 22 0lbs ea...

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