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Linear Acoustic upMAX 2251 User Guide
changing a password (if one has been set). Below are detailed descriptions of these
submenus:
I/O Options gives access to enable the upmixing process, add additional delay to the
outputs, and for muting individual channels. Note that GPI control will override up-
mix on/off and certain channel mutes. If you are unable to make an adjustment, GPI
is very likely active and is preventing any manual changes. Disable GPI as described
below.
GPI Setup allows configuration of the GPI A and B inputs. Each can be set to pro-
vide a specific function that will be active while the GPI pin (A or B) is held in a low
state. When GPI is enabled (the Enable GPI menu item is highlighted), the unit waits
for an external command via the GPI/O port and nothing else can be changed. To
make a change to the type of action each will produce, disable GPI by de-selecting
the menu item. The available functions include the following:
•
Disable
•
Upmix Off/On - Holding GPI low causes the upmixer to be activated. This mode is use-
ful when GPI A or B of the upMAX 2251 is being sourced from the Status Port of a
DP572 Dolby E Decoder as it will provide a constant 5.1 channel signal regardless of
whether the incoming signal is 5.1 channel Dolby E or PCM. See Section 3.1.1 for more
information.
•
Upmix On/Off - Inverted operation of above; Holding GPI low causes the upmixer to
be de-activated
•
Mute All Ext Inputs - Holding GPI low causes the Ext Center, LFE, Ls/Rs, and Lf/Rf
inputs to be muted.
•
Mute Ext Center - Holding GPI low causes the External Center input to be muted
•
Mute Ext LFE - Holding GPI low causes the External LFE input to be muted
•
Mute Ext Surround - Holding GPI low causes the External Surround inputs to be mut-
ed
•
Mute Ext LfRf - Holding GPI low causes the External Left front and Right front inputs
to be muted
Test Tones – Multiple setup tones are available to calibrate the upMAX 2251 and
other downstream equipment. The Level control is self-explanatory, but is set at the
standard –20 dBFS reference level and adjusts the overall level of the test signals. The
available test signals are:
• Sine – 1 kHz sine wave (frequency lower at lower sample rates)
• Voice – Voice ID of all selected channels
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