Connection of external microphone, Connection of external amplifier, Connection of external audio source – 2N Helios IP Audio Kit User Manual
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Loudspeaker impedance
Maximum power (at +20 dB)
4 Ω (min)
10 W
8 Ω
5 W
16 Ω
2.5 W
32 Ω
1.2 W
64 Ω
0.6 W
Connection of External Microphone
2N
®
Helios IP Audio Kit is equipped with an input for connection of an external
electret microphone on the MIC+ and MIC- terminals. Shielding of the shielded cable is
connected to the IN- terminal.
Connection of External Amplifier
2N
®
Helios IP Audio Kit is equipped with a line output for connection of an external
power amplifier on the LINE OUT+ and LINE OUT terminals.
−
Connection of External Audio Source
2N
®
Helios IP Audio Kit is equipped with a line input for connection of an external
audio signal source (FM tuner, MP3 player, e.g.) on the LINE IN+ and LINE IN termin
−
als.
Caution
Never connect a loudspeaker with impedance lower than 4 Ω to avoid
system damage.
Never exceed the maximum power output designated for the loudspeaker
to avoid loudspeaker destruction. Choose a loudspeaker with proper
impedance and maximum power values, or limit the maximum volume
level in the device configuration.
Caution
Undesired noise may be heard in the earphone where EMI affects the
microphone signal. To avoid this, connect the microphone using a shielded
cable of the minimum possible length.