Selecting the "Main EQ" check the general equalization curve of the entire audio system will be displayed. The tuning of this curve must be the last operation to be performed in your setup, and has the function to best adapt the frequency response of your audio system. By clicking on the POP UP activation icon 
, it is possible to display the main equalizer controls in full screen. If you do not use the POP UP mode it will always be possible to perform the system tuning but reducing the use of the equalizer functions.
◼︎MAIN EQ. SETTING
A. It is possible to change the equalizer parameters, in order to set an equalization curve via 6 Poles, of which 5 FiR (blue pole) and 1 IIR (green pole).By operating on the setup window it is possible to adjust the Frequency (f: 20 Hz ÷20KHz step min 1HZ), Gain (g: -15 dB ÷ +15dB step min 0.1 dB) and the Q factor (Q: 0.1÷ 16 step min 0.1) using the cursors.
Example of IIR pole adjustment
The curve can be manually edited using the mouse pointer. To be able to vary the "F" G" and "Q" factors, you will just need to act on the mouse wheel equipped with this function. A finer adjustment of these parameters can also be made using only the PC keyboard.
Example of FIR pole adjustment
- The keys 
and 
: allow the selection of the pole to be adjusted on the diagram. The successful selection of the pole is displayed by a circle around it.
- Key 
: allows the selection of the “F”,”G” and “Q” poles control point. The successful selection of the control point is visible through the green color of the control slider.
- Keys 
+ and + .
B. PCM FILTER MODE: this function operates on the internal DACS of the bit One HD Virtuoso (setting them internally ½ Fs); (Fs = 96KHz). It is only available on the analog outputs. By activating the AD LINK / AC Link outputs this function will not be available.
￭ SLOW ROLL OFF
Compared to the "FAST ROLL OFF" it has a less accentuated filter slope with a slightly wider bandwidth, more ripple and less filter delay.
￭ FAST ROLL OFF
Compared to the “SLOW ROLL OFF” it has a more pronounced filter slope, a smaller ripple around the cut-off frequency, and the filter delay is greater.
Since this filtering is outside the audio range and in the presence of other analog filters, their difference is really imperceptible and varies according to the kind of tracks you listen to, or the more or less complex structure of the audio system. The real differences can be appreciated once the Bit One HD setup is completed, where only listening tests will give reason to the most appropriate choice.