Solid State Logic THE BUS+, User Manual

Tutorial

15

THE BUS+ User Guide

D-EQ Switches

By default, the 

LF

 and 

HF

 bands are first order (6 dB per/oct) shelving filters with nominal attack and 

release times set in the D-EQ side-chain. However, the following switches allow for some different options:

HF BELL

Changes the filter type from shelf to bell for the 

HF

 band. Switching to this also changes the available 

frequency points, providing the ability to apply EQ in the critical upper-mid-range - see 

Frequency Points

page for more information. Switch lights bright white to indicate 

HF BELL

 is active.

HF FAST

Changes the time constants of the HF D-EQ band to 1 ms attack, 50 ms release. Switch lights bright white 
to indicate 

HF FAST

 is active. Nominal settings are 3 ms attack 50 ms release. 

Pressing and holding the switch allows for a third 

AUTO

 setting to be chosen. Switch lights magenta to 

indicate this. Time constants for 

AUTO 

are 10 ms Attack, AUTO release.

LF FAST

Changes the time constants of the LF D-EQ band to 10 ms attack, 50 ms release. Nominal settings are 
30 ms attack,100 ms release. Switch lights bright white to indicate 

LF FAST

 is active

Pressing and holding the switch allows for a third 

AUTO

 setting to be chosen. Switch lights magenta to 

indicate this. Time constants for 

AUTO 

are 10 ms attack, AUTO release.

LF/HF GAIN

The 

LF GAIN 

control (left-hand side of the unit) pr/- 10 dB of boost or cut to the 

low frequency band of the D-EQ. This is control over the 'static' band of the EQ. The 

LF 

GAIN 

can be used to apply a boost/cut of 'regular' EQ to compensate for any dynamic EQ 

activity. For instance, you may use the dynamic part of the EQ to compress the lows but 
add back in a bit of 

LF GAIN

 to compensate. The control is a 31-position stepped control.

Think of LF/HF GAIN being the equivalent to MAKE-UP Gain control you have for 
the Bus Compressor.

The 

LF/HF GAIN 

control (right-hand side) is the same as described for the 

LF GAIN

 (a 

static EQ control) but the 

MODE 

of The Bus+ determines whether it is a static gain for the 

LF

 or 

HF

 band.

For 

CLASSIC STEREO

 and 

�

S/C STEREO

,

the control acts on the 

HF

 Band. This is 

indicated by the 

G/HF

 LED being 

RED

. Please note, this is the only parameter on the 

right-hand side of the unit that is active in either of the stereo modes.

For 

DUAL MONO

 or 

MID SIDE

 modes, the control acts on the 

LF

 band. The colour of the 

G/HF

 LED may be either not lit or green in this mode but this is simply reflecting whether 

the 'G-Series' mode is active or not - see next page.

Red LED indicates the control 

functions as HF GAIN