Vortex Media VTX 1000 - Manual (Page 86)

S
YSTEM
L
AYOUT
The audio components for the room are 4 tabletop microphones, 1 Vortex EF2241, 1 video codec, 1 program
audio source, 1 SoundStation VTX 1000, and 2 ceiling loudspeakers. The loudspeakers are wired in parallel
to match the load requirements of the loudspeaker output of the Vortex EF2241 (4-8 ohms). Since the
loudspeakers have an impedance of 8 ohms each, we can wire them in parallel and then the impedance of
both loudspeakers will be 4 ohms. The equation to calculate that value is:
Each of the microphones will use Inputs 1-4. The interface module will use Input B / Output B. The video
codec will use Input A / Output A. The program source will use Inputs C and D. The subwoofer will use
Output D. The loudspeakers will use Output L.
We will assume that the microphones have balanced connections (.775 Vrms professional nominal levels).
The Interface Module, subwoofer, program audio, and video codec will have unbalanced connections
(typically .3 Vrms consumer nominal levels).
We will set the output to the subwoofer at -30 dB in order to protect the subwoofer from "bottoming out"
on high-amplitude transient sounds.
The telephone wall jack is connected to the L INE jack of the Vortex EF2241 so that narrowband telephone
calls can be controlled via an external control system. The P HONE jack of the Vortex EF2241 is connected to
the phone jack on the VTX Interface Module in order to facilitate wideband calls from the SoundStation VTX
1000.
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