ESR212 · Technology
Technology
The ESR212 is a 3-way high output, active-driven, full range Loudspeaker module. It is designed as part of a sound
reinforcement speaker system that includes the ESR2800 system control and amplification system. The ESR212 Loudspeaker
system benefits from being designed exclusively to operate above 40 Hz. By optimizing the ideal operating band pass of each
system component, the ESR212 can achieve extremely high output levels consistently and safely.
Active-driven by the ESR2800 unit
Power, electronic crossovers, phase alignment, equalization, time correction and speaker protection are provided within the
ESR2800 unit. This “one plug in, one-plug-out” system ensures fast, easy set up and complete control. It gives you the benefits
of active sound reinforcement technology, yet locates the electronics in an easy-access rackmount module. Together, the
ESR212 and ESR2800 unit deliver the highest dynamic range of any system currently available, providing new levels of clarity,
depth and resolution.
Advanced compression driver
KV2 Audio’s transducer partner, 18 Sound in Cavriago, Italy, manufactures and co-develops all ESR212 components. The
compression driver is a 1.75-inch nitride-titanium diaphragm design, featuring a complex geometry phase plug that
dramatically lowers distortion, eliminates ring modes and provides clearer, ripple free performance.
Exclusive KV2 rotatable horn design for maximum flexibility
The ESR212 features a mid/high integrated horn design with a number of unique features. First, the horn can be rotated
90°, allowing for complete flexibility in selection of vertical, horizontal system set up. The horn design is based on constant-
directivity geometry with an emphasis on maintaining low transducer compression ratios, high output and wide dispersion
(90° x 40°). The midrange speaker is fixed to a large aluminum heat sink which is attached to a precisely designed midrange
“chamber”. The combination provides optimal cone loading and heat dissipation. Further loading and dispersion is controlled
through a 2.28” (58mm) precision phase plug.
Heat-resistant midrange
Midrange frequencies between 500Hz and 2.5kHz are reproduced by a six-inch midrange speaker that provides 106 dB
of sensitivity (1 watt / 1 meter) when coupled with the integrated horn. The magnetic motor assembly features a high
temperature 1.75” (44mm) diameter voice coil assembly and extensive use of neodymium. Because of the limited linear
movement of most midrange transducers - usually 2-3mm - ventilation of the voice coil assembly and magnetic structure is
poor and failure rate from heat fatigue is high. The ESR212 midrange dissipates heat passively through the use of a massive
aluminum heat sink. When combined with the ESR2800 unit control electronics, the system provides high output levels safely
and consistently over infinite periods of time and dramatically reducing heat associated transducer problems such as power
compression and decreased dynamics.
Neodymium bass transducer
The ESR212 features a twelve-inch neodymium bass speaker with front loaded bass reflex design. It is important to note
that neodymium is not a transducer panacea, as it cannot safely operate at the same typical operating temperatures ferrite
does. Using neodymium requires a profound understanding of material science and finite element analysis to properly
design a stable, high force magnetic structure that functions correctly. 18 Sound and KV2 audio engineering jointly designed
the twelve-inch mid bass driver for the ESR212. The ESR212 bass transducer reproduces frequencies from 38Hz to 500Hz.
The bass transducer is very precise and fast with high sensitivity. The high efficiency
neodymium motor provides an extraordinary amount of force that delivers complete
control of the cone mass and a high overall weight loss.
Easy to set up
The ESR212 is an aesthetically pleasing - looking enclosure featuring a number
of ergonomically designed components that make it a light, small, and easy speaker to set
up and use. ESR212 features the two top handles for pick up and reposition. There are six
industrial grade, internal braces placed at each corner and one internal brace on the back.
Corner braces are held in places by two M10 bolts, the back brace is held by two M6 and
one M10, providing a wide range of installation and suspension flexibility.
ESR212 rear panel
Cable connection to ESR2800 unit Amplifier/Controller
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ESR212 ·
Technolo
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