The Stella-8C ceiling mount installation loudspeaker is a self-powered
loudspeaker engineered primarily for use in Meyer Sound's Constellation
electroacoustic architecture. Housed in an aluminum die cast enclosure
with a heatsink on the back, the Stella-8C can be flush-mounted in ceilings
and walls with standard backboxes (Not Included) for 8-inch drivers (with
a minimum depth of 6.5 inches).
The Stella-8C delivers similar acoustical performance as the Stella-4
and Stella-4C loudspeakers, but with expanded output capability and wider
coverage. The unit's 8-inch coaxial cone and 0.75-inch tweeter transducers
can produce a maximum peak SPL of 117 dB at one meter over a wide frequency
range of 100 Hz to 22 kHz. The Stella-8C contains amplification and signal
processing onboard and exhibits the same low distortion, high intelligibility,
and flat frequency and phase response for which Meyer Sound products are
known. As a self-powered loudspeaker, the Stella-8C offers simplified
installation for the multichannel output of Constellation systems or other
installation applications.
Balanced audio and DC power are fed to the Stella-8C from a 5-pin Phoenix
connector on its rear panel. Meyer Sound's patented Iso-Input transformer-isolated
differential input circuit yields a high common mode signal rejection
ratio (CMRR). Powering the unit from a unipolar 12 to 18 V DC external
power source reduces induced noise significantly, while the use of a low
voltage supply eliminates the need for wiring conduits.
The required method for delivering balanced audio and DC power to the
Stella-8C is with the Stella-188 external power supply. The single-space
19-inch rack unit can accommodate up to eight Stella-8Cs (one per channel
output). The Stella-188 receives eight channels of balanced audio from
its 25-pin D-sub connector and routes the audio, along with 18 V of DC
power, to its 5-pin Phoenix output connectors for greater wiring convenience.
Cable runs to the Stella-8C of up to 150 feet are possible with just 1
dB of loss in peak SPL using 18 AWG wire.
The use of composite multiconductor cables (such as Belden 1502R) allows
a single cable to carry both audio and DC power from the Stella-188 to
the Stella-8C. The Stella-8C amplifier and signal processing circuits
are designed to tolerate voltage drops of up to 30 percent, thereby accommodating
light-gauge cables and long cable runs. Internal energy storage circuits
minimize the system's peak-to-average current demands, ensuring efficient
use of the Stella-188's 18 V DC output.
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