ETS VBF-1 Instructions

ETS VBF-1 Instructions

Microphone voice bandpass

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VBF-1 Microphone Voice Bandpass
Filter / Interface Instructions
The VBF-1 is a single channel voice bandpass filter / interface for use with all SM1 series microphones.
The VBF-1 is useful installed in environments with high levels of background noise. VBF-1 features a
convenient way of supplying power to the SM1 and installer friendly termination of the cable runs. The
VBF-1is typically connected to recording equipment such as DVRs, IP cameras, etc. Note the audio
output signal of the VBF-1 is line level (0dbm).

SM1 Microphone Placement

Locate the SM1 microphone in the center of the space to be monitored. If a large area is to be monitored,
locate the SM1 in the middle of the room. Do not mount the microphone near air conditioning vents, light
fixtures or electrical equipment. The SM1 should be placed as close as possible to the subject(s) to be
monitored. The SM1 is usable at distances of up to 25 feet but is dependent on the level of background
noise in the area. Experimentation in the environment will determine what distances work best.

VBF-1 location and power

The VBF-1 interface box is designed to be located next to a DVR or IP camera. The VBF-1 requires a
120VAC power source within 3 feet of its location. If this is not possible in your application, you can splice
in up to 100 feet of 22 awg, 2 conductor cable to extend the distance between the AC power source and
the VBF-1.

Cable Run

Run a 22 gauge, stranded, two conductor shielded cable between the VBF-1 interface and the SM1
microphone. Keep the cable run distance at or under 1,000 feet and away from AC power sources, light
fixtures and electrical equipment. See Figure 1 for connection diagram.

Adjusting the SM1 gain and VBF-1 level controls

If the VBF-1 will be plugged into a "microphone level" input of an IP camera, set the SM1 gain slightly
clockwise (or 1/8 of a full turn) from full counter-clockwise. Then use the "level control" on the VBF-1 to
set a volume that produces an acceptable audio level at the head end.
If the VBF-1 will be used with a "line level" input, turn the gain control of the SM1 to 3/4 full clockwise and
adjust the level control on the VBF-1 to produce the clearest audio level at the head end.

SM1 filters

Switch both LC and HC filters of the SM1 to the 'in' position to further enhance the voice band pass of the
VBF-1.

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Summary of Contents for ETS VBF-1

  • Page 1 If the VBF-1 will be used with a “line level” input, turn the gain control of the SM1 to 3/4 full clockwise and adjust the level control on the VBF-1 to produce the clearest audio level at the head end.
  • Page 2 Warranty All ETS products carry a one year parts and labor warranty. This warranty does not cover damages as a result of misuse, improper handling of the unit or exposure to extreme temperatures or moisture. At its discretion, ETS reserves the right to repair or replace this unit under the conditions of the warranty.

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