MSB Technology DAC IV plus, User Manual

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Operational Menu Options
The high level menu options have to do with operation settings. They are things that you may want to change on the fly as you listen to
different music or with different equipment. See the Menu tree for details.
Upsampling on/off - Upsamples all incoming music to either 384 kHz or 352.8 kHz.
Phase Invert - Toggling the Phase Invert will change the absolute phase of the output. There are some recordings that “accidentally”
swap the phase. For those who are phase sensitive, we always include this option. The phase of the outputs is inverted digitally.
Filter Select
- This feature lets you select among a number of preloaded filters. There is not right or wrong filter as the best filter depends
on the original recording and the rest of the components in your system. We are always working to develop new and better filters to
compliment different system characteristics.
Upsampler Select - Upsampling algorithms may also be selected from among the preloaded options.
User Button - Defines the function associated with the user button * on the front panel.
Remote User Buttons - Defines the function associated with the remote user button 1, 2 and 3 on the remote control.
About - Displays information about the unit including the version number, serial number, distributor, and year of manufacture.
Setup Menu Options
The second level menu options have to do with setup parameter - things you will only need to set once. In most cases you will not need
to change any of these settings. See the Menu tree for details.
Reclocking - This very important feature of the DAC allow all jitter to be removed from the input source. Data is read into a memory
and then independently read out using a ultra stable clock. When enabled this option will completely replace the incoming clock with
an ultra low jitter TCXO based clock. The DSP monitors the incoming sample frequency and detects standard sample rate signals,
44.1 kHz, 48 kHz, 88.2 kHz, 96 kHz, 176.4 kHz, 192 kHz, 352.8 kHz and 384 kHz. The on-board clock then completely replaces the
incoming clock. Other sampling frequencies use the incoming clock from the source. The DSP allocates a huge internal FIFO buffer
(1/2 second at 44.1) that stores the incoming audio to decouple the incoming and outgoing data streams. Long absolute digital silences
in the music stream, such as between tracks and during pauses, are selectively shortened or lengthened by the DSP to maintain data
synchronization. This results in a significant delay between the audio source and the analog audio. You will not normally notice this
delay unless video is synchronized to the audio. For this reason this feature may want to be turned off when watching video, or the
video should be delayed. While using the on-board clock some very long musical performances greater than one hour with no silences,
pauses or track skips may cause a buffer overflow when using a standard transport. This will sound like a small CD skip. You will
probably never encounter this case but if you do MSB can install a special ultra high accuracy clock in your transport or other audio
source to totally eliminate this possibility.
Single-ended Mode - This setting optimizes the DAC for single-ended RCA outputs rather than balanced XLR output. In the single-ended
mode, both the non-inverted and inverted DAC are summed to make the very highest quality single-ended output, at the expense of
the balanced output which is then disabled. In the balanced mode, both outputs work, but the single-ended output is simply the non-
inverted output from the balanced output.
DAC Output - This unique feature adjusts the output of the DAC digitally. It is especially useful when no volume control is installed,
for optimally matching the DAC output to a preamp input. Many preamps sound much better with a lower level signal. With MSB
volume modules installed this setting should be left at 0 db.
Output Single-Ended Balanced
+3 dB 3.57 Vrms 7.14 Vrms This setting for measurement purposes only
0 dB 2.62 Vrms 5.23 Vrms
-3 dB 1.79 Vrms 3.57 Vrms
-6 dB 1.27 Vrms 2.53 Vrms
-9 dB 0.98 Vrms 1.97 Vrms
Display Brightness
- Adjustable from 1 to 15.
Display on/off - When turned off, the display pops on for a bit any time anything is adjusted, then turns off again.