Operation
Quickstart
!
Caution!
Extremely high acoustic output
Before switching the AXM 12A’s power on, make sure to set the level controls in their fully
counterclockwise position -∞. Otherwise, this could result in extremely high acoustic output,
especially when the connected audio source is already playing. It is particularly dangerous
when a microphone is connected, because of the possibility of acoustic feedback.
The input section of the AXM 12A allows the connection and mixing of three individual audio
signal sources:
•
INPUT 1 MIC/LINE
•
INPUT 2 MIC/LINE
•
INPUT 3 AUX IN
Turn the MENU/ENTER rotary encoder to set the level setting indicated in the home screen to
0 dB.
MIC/LINE
1.
Before connecting an audio signal source, turn the INPUT 1/2 control all the way down
(counterclockwise).
2.
Connect a microphone via XLR-type cable or a line level audio signal source (e.g. mixer,
keyboard, etc.) via a 0.25-inch jack plug to a MIC/LINE input of the AXM 12A.
3.
Switch on the audio source or switch the microphone on and speak into the mic.
4.
Slowly increase the setting of the INPUT 1/2 control until the desired volume is achieved.
!
Caution!
Too high level setting can result in acoustic feedback. Therefore be careful when turning the
INPUT 1/2 control.
5.
The Hi, Mid and Lo menu items let you match the sound according to acoustical
conditions. Again, be sure to keep the feedback threshold in mind. Whenever you notice
feedback noise after making a certain change, decrease the setting of the control that you
have just used by a little bit. Alternatively, you can activate the feedback filter, please
refer to sections Menu, page 12 and Avoid acoustical feedback, page 16.
AUX IN
1.
Before connecting an audio signal source, always turn the INPUT 3 control all the way
down (counterclockwise).
2.
Connect an audio signal source (e.g. CD/MP-3-Player) to the AXM 12A’s AUX IN using an
RCA jack-type cable.
3.
Switch on the audio source and then slowly increase the setting of the INPUT 3 control
until the desired volume is achieved.
4.
The Hi, Mid and Lo menu items let you match the sound according to acoustical
conditions.
7
7.1
AXM 12A
Operation | en
15
Bosch Sicherheitssysteme GmbH
User manual
18-Mar-14 | 02 | F01U290507