SM4 4-Channel Mixer
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1. Remove all packing materials and decide where the unit is to be physically
placed. The SM4 can be mounted in any standard 19” rack (requiring one rack
space), or used on a tabletop.
2. Before connecting a microphone or line level audio device, make sure that the
power to all your systems components, including the SM4, are turned off.
3. Using an XLR or 1/4” cable, connect a wired microphone or the output of a wire-
less microphone receiver to the Mic input jack on the rear of the SM4.
4. Connect a music source, like a CD player, to the RCA jacks on the rear panel of
the SM4. The red connector is the right input and the white connector is the left
input. Portable audio devices, like an MP3 player, can be connected to the 1/4”
or 1/8” stereo inputs on the front of the SM4.
5. Connect the outputs of the SM4 to the inputs of a power amplifier or speaker
system using XLR or RCA cables.
6. Turn the SM4 Master Volume control all the way down and turn the SM4 power
on.
NOTE: It is important to remember the Golden Rule of audio … “LAST ON,
FIRST OFF”. Translated, this means that when turning on your system, you
should always turn your power amplifiers or powered monitors on LAST, and
when turning your system off, turn your power amps off FIRST. This helps avoid
any loud pops caused by rush current at power up, which can sometimes dam-
age loudspeakers.
7. Turn the power amplifier or speaker system on and turn the volume up.
8. Set the MIC volume control of the SM4 to the 12 o’clock position.
9. While talking into the microphone, raise the MASTER VOLUME control until you
have reached the desired level.
10. Play music from the connected music source and raise the MUSIC volume con-
trol. Adjust the MIC and MUSIC volume until the microphone signal is able to be
heard above the music.
Quick Start
Feedback is the annoying howling and squealing that can heard when the
microphone picks up sound from the speaker. The sound is then re-amplified back
through the speaker again, creating a feedback loop. Follow these steps to minimize
the likelihood of feedback:
• Avoid pointing the microphone directly at the speakers. In general it is
recommended that the microphone be positioned behind the speaker enclosure.
This uses the directional characteristics of the speaker and microphone to your
advantage.
• Keep the microphone as far from the speakers as possible. This will help achieve
isolation between the speaker and the microphone.
• Position the microphone as close to the sound source as possible. This will
enable the microphone to pick up more direct sound, and allow you to reduce
the microphone input gain control.
Avoiding Feedback
