a-them AVM 90 Operating Manual page 42

Mode Presets
Dolby Surround up-mixes all stereo, 5.1, and 7.1-channel content to take full advantage of all speakers in a Dolby
Atmos system.
Unlike previous wideband upmixing technologies, Dolby Surround can steer frequency bands individually, producing
surround sound with precisely located audio elements and a spacious ambiance. Dolby Surround replaces the Dolby
Pro Logic II family of upmixers, offering greater flexibility and superior audio performance.
A Center Spread control, accessible by pressing the Mode button, enables the spreading of the center image across a
broader front soundstage. This adjustment is suitable when using a screen that is wider than average.
DTS Neural:X uses all speakers in a DTS:X system for an immersive audio experience, creating separation by placing
sounds at different points in the sound field. This mode does not apply to DTS:X Master Audio, DTS:X, Dolby Atmos,
Dolby TrueHD, and Dolby Digital Plus sources. When the source is a DTS stream, Direct mode plays the audio channels
as recorded, whereas Non-Direct mode adapts the audio to your speaker layout if it is different from that of the
content creator.
All Channel Stereo mode sends the left and right channels to the surround channels with equal loudness while the
center channel and subwoofer receive a combination of both.
All Channel Mono sums all channels and distributes an identical signal across all speakers. The only difference
between each signal speaker will be determined by their crossover setting and therefore how much bass each will
play.
Lip-Sync Delay
If you hear the audio before seeing its corresponding image, you can set up to five hundred (500) milliseconds of
audio delay. Set this using trial and error or a synchronization test disc. Movies are not always the best test because
sounds, including dialog, are usually re-recorded after the filming is completed, and can be slightly out of sync at
various points in the recording. While viewing a movie, you can also make adjustments after pressing the Lip-Sync
button.
Input Trim
If your inputs have varying degrees of volume causing spikes in volume as you change between inputs, you can
normalize these by setting your input trim per input. This menu offers both + and - options for input trim but we
recommend setting your quietest input at 0.0 dB and normalizing your louder ones around that by trimming them
down, this is recommended because one input may be very loud and trying to turn the rest up to match it could clip
the incoming signal.