ETS SMEA-1HP Instructions

SMEA-1HP Interface Instructions
The SMEA-1HP is a single channel, high current, one way Interface box designed to be used with ETS
accessories/microphones and Power Over Ethernet IP cameras. It provides a convenient way of supplying power to a
noise reduction unit (or mixer, etc) and microphone(s) by tapping power off the camera's PoE connection. The SMEA-1HP
also features installer friendly termination of the cable runs and a standard RCA or 3.5mm audio output connector.
The SMEA-1HP can be connected to a "microphone" or "line" level input of a POE IP camera.

SM1 Microphone Placement

Locate the SM1 microphone as close as possible to the area of interest in 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 still usable at 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.

SMEA-1HP location and power

The SMEA-1HP interface box is designed to be located any place along the IP camera CAT5 cable run. It must be located
in between the IP camera and the router or switcher as shown in figure 1.
NOTE- The IP camera MUST be connected or the SMEA-1 will not power up.

Cable Run

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

Mounting

The SM1 can be surface or flush mounted on ceilings or walls. For flush mounting, cut a 2 ¼" by 2 " hole in the wall or
¾
ceiling tile to allow room for the circuit board and mount the SM1 to the surface with screws.
Adjusting the SM1 "gain" and SMEA-1HP "level" controls
If the SMEA-1HP 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 SMEA-1HP to set a volume that produces
an acceptable audio level at the head end.
If the SMEA-1HP 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 SMEA-1HP to produce the clearest audio level at the head end.

Setting the SM1 Switches

The "Volume Range" switch should be set to the "LO" position when using the SM1 with IP cameras that utilize
"microphone inputs" also known as "Mic. Level" inputs. This sets the maximum gain of the SM1's pre-amp to x11. The
switch should be placed in the "HI" position when using IP cameras with "Line level" inputs of DVRs and IP cameras. This
sets the maximum gain of the SM1's pre-amp to x121.
The normal frequency response of the SM1 microphone is 500-13Khz. When both switched "in", The "HI Cut" and "Lo
Cut" filters set the SM1's frequency response to 900-3.9Khz . Enabling one or both of the filters is useful when
background noise needs to be reduced and intelligibility of speech emphasized. We recommend experimenting with the
switch settings to achieve the best acoustic result for your application (s).
SMEA-1HP Mode switch: The SMEA-1HP supports Both Modes A and B of IEEE802.3af POE. The SMEA-1HP is
pre-configured for the most common use of the "end point" POE IEEE802.3af standard (mode A). If the power LED does
not illuminate in this position, try the mode B position (mid span).