Onkyo TX-NR900 Audio Adjust, LFE Level Sub-menu, Mono Sub-menu, Theater-Dimensional Sub-menu

Audio Adjust

3-5. LFE Level Sub-menu

This sub-menu is for setting the LFE (Low Frequency Effect) levels included in Dolby Digital and DTS software.

Setting	Values	Initial value
a. Dolby Digital	–∞, –10 dB to 0 dB	0 dB
b. DTS	–∞, –10 dB to 0 dB	0 dB

a. Dolby Digital

The level can be adjusted to either –∞or between –10 and 0 decibels in 1-decibel increments. For Dolby Digital input source signals, the LFE level set here is used. A setting of 0 decibels is recommended for optimum performance; however, if the source is recorded with the low frequency range too strong, lower this setting as necessary.

b. DTS

The level can be adjusted to either –∞or between –10 and 0 decibels in 1-decibel increments. For DTS input source signals, the LFE level set here is used. A setting of 0 decibels is recommended for optimum performance; however, if the source is recorded with the low frequency range too strong, lower this setting as necessary.

3-6. Mono Sub-menu

The settings of this sub-menu shown below are enabled when the listening mode is set to “Mono.”

Setting	Values	Initial value
a. Academy Filter	On, Off	Off
b. Input Channel	Auto L+R, Left, Right	Auto L+R

a. Academy Filter

Older monaural film mixes relied on high-frequency rolloff in presentation to sound properly balanced, so that excessive hiss from the grain structure of the film would not be heard. The high- frequency loss was typically due to a combination of optical slit loss, electrical filters, loudspeaker response, and screen loss. Some films have been transferred to video without such a high-frequency rolloff, and thus sound overly bright and hissy.

The TX-NR900/900E includes this “Academy filter,” which is based on contemporary playback practices for such films over wide-range systems.

This can be set to either “On” or “Off.”

b. Input Channel

This allows you to set which input channel to use for monaural sound.

Auto L+R: Select this under normal circumstances. When the input source is center channel, this center channel is used as the monaural sound input channel. Otherwise, the left and right channels are mixed and the mixed signal is used as the monaural sound input channel.

Left/Right: You will need to select either left or right when playing a video source that contains bilingual data. In such a case, the left and right channels will contain the audio for different languages. Select the channel with the language you desire.

3-7. Theater-Dimensional Sub-menu

Select this to modify the Theater-Dimensional (T-D) listening modes. The settings available are shown in the table below.

Setting	Values	Initial value
a. Listening Angle	20°, 40°	40°
b. Center	On, Off	Off
c. Front Expander	On, Off	Off
d. Virtual Surr Level	–3 dB to +3 dB	0 dB
e. Dialog Enhance	On, Off	Off

a. Listening angle

The listening angle is the angle subtended by the front left and right speakers as seen from the listener. The processing for the virtual surround will be based on this angle. The setting of 20 and 40 degrees are only for nominal purposes, so select the setting that is closest to your actual listening angle.

Front left speaker Front right speaker

Listening angle

b. Center

In the Theater-Dimensional mode, if the speaker system has a center speaker, the center channel signal can be output from the center speaker. For instance, in systems where the front left and right speakers are small, use of the center speaker may provide a better sound space and reduce the load on the front speaker. (For the proper soundfield, it is important that the speaker levels and speaker distances among the front right, front left, and center speakers are matched. In order to ensure this, make sure that the settings in the Speaker Distance Sub-menu and Level Calibration sub-menu are set correctly.)

On: Select to have the center channel signal output to the center speaker.

Off: Select to have the center channel signal output to the front left and right speakers (Phantom Center).

c. Front Expander

The front expander function spreads out the stereo image in front of the listener. The created stereo image is as if the front speakers have been farther apart for the feeling of a wide sound space. This is especially useful for narrow listening angles of 20 degrees or less.

On: Select to turn on the front expander function to simulate a wider sound space.

Off: Select to turn off the front expander function for a normal sound space.

d. Virtual Surr Level

This setting adjusts the level of the virtual surround signal. This can be set from –3 to +3 decibels. Lowering this setting can improve the sound when the definition is unclear or when the sound feels unnatural.

e. Dialog Enhance

If the dialog from the center channel is difficult to hear in the Theater-Dimensional mode, use this setting to improve the clarity.

On: Select to enhance the vocal ranges of the center channel signal.

Off: Select to output the center channel signal at the regular level and frequency characteristics.

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