AB-COM IPBOX 400S Manual - page 50
Manual is about: Digital Satellite Receiver
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14.1.3. Aspect Ratio
Select 4:3 PS (Pan & Scan) or 4:3 LB (Letter Box) for Standard TV or 16:9 for wide
screen TV.
14.2. LNB Setting
Tuner 1, Tuner 2
Select Tuner 1 or Tuner 2 first.
Make sure your tuner Connection is Separated or Loop Thru.
In case of Loop through connection, tuner 2 is selectable for set up.
In case that the receiver is connected both tuner 1 and tuner 2, select tuner 1 for the set up first,
then consecutively select tuner 2 for the set up.