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and use the built-in balanced 24-bit D/A converters. This will bypass the CD-player’s
own normal 16-bit D/A converters and improve playback quality significantly.
The Sphere AV100/120 is also optimised for D/A conversion of the 24bit/96kHz
stereo DVD music discs.
2. Volume controls
The master volume level is set by rotating the volume knob on the front panel or by
using the “VOL ⇑” or VOL ⇓” key on the remote control.
The volume adjustments are scaled, so that at normal listening levels, the setting is
extremely accurate with 0.5dB steps, while at lower levels the step size increases to
allow a more rapid setting. The scaled volume setting is the most convenient for
normal users, and is therefore set as default.
However, it is possible to change the volume to 0.5dB steps for the entire volume
range by changing it in the config.volume menu.
The volume trims between each channel are set under the config.noise menu by
comparing the perceived sound volume from each channel via the built-in noise
generator, so that you can compensate for speaker sensitivity differences and
distances from listening position.
We recommend that the settings for each channel after using the config.noise option
are stored as initial settings for each of the individual Stereo, ProLogic II, Dolby
Digital and DTS memory banks. See further description of the memory banks in
section 5.
However, each surround mode may lead to a different setting of volume trims based
on individual requirements. In Thule Audio’s experience, Dolby Digital and ProLogic
II mode gain can be increased 3 – 6 dB more in the surround speakers than
“measured” under the noise test to obtain a more realistic surround image. Also in
DTS mode, the gain can be increased 2 – 4 dB in the surround speakers. These
more practical settings based on individual requirements can then be stored under
each memory bank for automatic reload depending on chosen surround mode.
Each movie or music source may also lead to a different setting of volume trims.
Therefore it is possible to adjust the volume trim “on the fly” directly by pushing the
channel “L”, “C”, “R”, “SL”, “SUB” or “SR” key on the front panel or remote control.
However, for setting the volume trim from the front panel on AV100/100S, it is
necessary to toggle the “channel” knob.
Subsequently, the extended surround channels “SC”,”SSL” and “SSR” can be
selected for adjusting by using the arrow keys. The channel level can then be
adjusted by rotating the volume knob on the front panel or by pressing the “VOL ⇑”
or VOL ⇓” key on the remote control.
The volume trim settings changed “on the fly” will return to the default settings stored
in the memory banks when the AV100/120 is set into standby or power is turned off.
By pushing the “SUB” key on the front panel or remote in for 2 seconds, the LFE
(low frequency effect) channel is activated for adjusting. The LFE channel is the
bass information, which is sent to the subwoofer or alternatively sent to the “L” and
“R” channels if the subwoofer is deactivated. In this way, it is possible to adjust the
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