SM5-EQ Microphone kit Instructions
The SM5-EQ is a single channel audio equalizer and microphone interface designed for use in acoustically difficult
environments such as interrogation rooms. Note- the audio output of the SMEQ-1 can be set for “microphone” or “line
level output”.
SM1 Microphone Placement
Locate the SM1 microphone as close as possible to the area of interest in the space to be monitored. 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 useable 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.
Adjusting the SM1 Gain
The SM1 output level is set by selecting the desired volume range and adjusting the gain control.
The “Volume Range” jumper 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 x14. The
jumper 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 x196.
The SM1 is shipped with the gain set at midrange. If the sound at the “head end” is distorted, rotate the control towards
the – mark (counter-clockwise). If the volume at the “head end” is too low, rotate the control towards the + mark
(clockwise).
Setting the SM1 Hi-Cut/Lo-Cut Jumpers
The normal frequency response of the SM1 microphone is 500-13Khz. When both jumpered “in”, The “HI Cut” and “Lo
Cut” filters set the SM1’s frequency response to 900-6Khz . Enabling one or both of the filters is useful when background
noise needs to be further reduced and intelligibility of speech emphasized. We recommend experimenting with the jumper
settings to achieve the best acoustic result for your application.
SMEQ-1 location and power
The SMEQ-1 interface box is designed to be used as a stand alone DVR or I/P camera interface or it can be used “in line”
with any ETS base station. When used as a DVR or I/P camera interface, use the supplied AC adaptor. When the SMEQ-
1 is used with an ETS base station, The AC adaptor is not required because it draws power from the ETS base station.
Cable Runs
Run a 22 gauge, stranded, two conductor shielded cable between the SMEQ-1 module and the SM1 microphone and the
SMEQ-1, and ETS base station or interface box. Keep the cable run distances under 1,000 feet and away from AC power
sources, light fixtures and electrical equipment.
See Figure 1 for connection diagram.
Audio input
Connect any SM1 series microphone to the microphone input OR any other “line level” signal to the audio input. Do not
use both inputs at the same time.
Adjusting the microphone “gain” and SMEQ-1 “level” controls (audio output)
If the SMEQ-1will be plugged into a “microphone level” input of an IP camera, set the microphone gain of the SM1-xx
slightly clockwise (or 1/8 of a full turn) from full counter-clockwise. Then use the “level control” on the
SMEQ-1 to set a volume that produces an acceptable audio level at the head end.
If the SMEQ-1 will be used with a “line level” input, turn the gain control of the SM1-xx to 3/4 full clockwise and adjust the
level control on the SMEQ-1 to produce the clearest audio level at the head end.
Available from A1 Security Cameras
www.a1securitycameras.com email: sales@a1securitycameras.com
