These settings adjust the audio input and output.

Input source
Choose the desired input source.
All input sources except "Line stereo" are mono.
If you are using an Annuncicom 200 a further option is available to select the SUB connector for Aiphone use. If this is selected the audio output will also be directed to the SUB interface.
NOTE: Aiphone panels have a "ring" button which when pressed produces a signal on the SUB interface. This signal is used to trigger digital input 0 on the Annuncicom. However, this signal may also be triggered by audio input and is, therefore, filtered out by the FW. For this filter to be effective, Aiphone panels should only be connected to the SUB interface if the SUB interface is selected as an input source. Default setting is "Mic".

Speaker Also As Microphone
A speaker can be wired to an Annuncicom so that it can also be used as a microphone.
In this case connect the speaker between (+) (A5) and ground (A3 or 4) instead of between (+) and (-) and connect (+) to the Microphone Input (A1). You will find the pin outs in the Annuncicom Quick Install guides. Barix Annuncicom Family
For proper operation of the device this feature should only be selected if the speaker is wired as described.

Microphone gain
Choose the desired gain ("21" - "43.5" dB) for the microphone.
Default setting is "21" dB.

A/D amplifier gain
Choose the desired gain ("-3" - "19.5" dB) for the A/D amplifier.
Default setting is "-3" dB.

Loop Input to Output
Choose "Yes" to hear the attached input on the local Line Out (For testing only, feedback may occur when using a speaker).
Default setting is "No".

Encoding
Choose between different encoding types (audio compression) and sampling frequencies.
From "MPEG1 / 48 kHz" down to "MPEG2 / 16 kHz" and "uLaw", "aLaw" or "PCM" at 8 or 24 kHz.
Default setting is "MPEG2 / 22.5 kHz".

MPEG Encoding Quality (MP3 only)
Choose between "0 lowest" and "7 highest" in steps of 1.
The Encoder Quality table below shows the average bit rate in kbit/s for the quality settings and sampling frequencies in kHz.
Default setting is "0 lowest".

Qual.	0	1	2	3	4	5	6	7
44.1	65	68	73	80	90	105	125	140
22.05	35	38	40	45	50	60	75	90

Volume
Choose between "0"% and "100"% in 5% steps.
Default: "50"%

Bass
Choose between "-10" and "10".
Default: "0"

Treble
Choose between "-10" and "10".
Default: "0"

Loudness Level
Choose between "0" and "20".
Default: "20"

Loudness
Choose between "0" and "20" and switch the Loudness "On" or "Off".
Default: "Off"

Output Mode
Choose one of the "Mono", "Stereo" or "Bridge" settings.
The "Mono" mode produces a monophonic output signal out of both channels.
The "Stereo" mode lets both channels through.
The "Bridge" mode creates a mono differential left/right signal for connecting a single double-impedance speaker as a bridge between left and right channel.

Note: The "Stereo" and "Bridge" settings apply for stereo hardware only.
The output mode should correspond to the audio encoding used. The MPEG encoding is stereo, whereas uLaw, aLaw and PCM can transmit only monophonic signal.

MP3 Frame CRC
If set to "enable", the encoder will include the CRC-16 in each MP3 frame.
Default setting is "enable".

MP3 Bitreservoir Mode
The Bitreservoir is used to compensate the differences between the predefined frame sizes. If set to "used", the encoder will use the bitreservoir.
Default setting is "used".

MP3 Copyright Protection
"Enable" or "disable" the copyright protection bit in the MP3 bitstream.
Default setting is "enable".

MP3 Stream Type
Select between a "copy" or an "original" bitstream in order to set the appropriate bit in the MP3 bitstream.
Default setting is "copy".

MP3 Emphasis
Select emphasis "none", "50/15 us" or "CCITT J.17".
Default setting is "none".