HHB Circle 5 Operating Instructions Manual page 2

Overview
HHB Circle 5 loudspeakers are designed to produce an accurate and highly detailed sound,
both on and off axis, making them ideal for use in stereo and surround sound professional
monitoring applications. Available in active and passive versions, more than 20 years'
experience and a number of unique innovations have combined to produce a compact
studio monitor capable of performing in the most demanding professional environments.
Both versions of the Circle 5 feature a solid-state Polyswitch
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
warning LED on the tweeter. After several minutes of cooling off, the switch auto-resets,
having saved the tweeter from overload and subsequent damage.
Key Features - Passive & Active
• Detailed, accurate and dynamic sound, both 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 colouration
• Magnetically screened for use close to video / computer monitors
• Individually tested and matched ferro-fluid cooled soft dome tweeter
• Solid state, Polyswitch
• Rigid, non-resonant, seamless ported cabinet, finished in durable black paint
• Many professional monitoring applications, including project studios, commercial studios,
multimedia applications, broadcasting and post-production
• Can be used as part of a surround sound monitoring system
Key Features - Active Only
• 120W LF / 70W HF integral amplifier pack
• Balanced XLR and unbalanced RCA phono inputs
• Push-Pull amplifier design for tight, controlled low-end performance
• Extra-large toroidal transformer for added headroom and low hum field
• Individually calibrated active filters
• Low Q Sallen and Key active filters minimise 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
2
® in the Circle 5 cuts all power to the tweeter and illuminates a red
® tweeter overload protection
® that protects the tweeter from