UAD Powered Plug-Ins Manual v5.2 - Just Music

Helios Type 69 Controls
Overview
The simple yet powerful Helios Type 69 Passive EQ adds a unique sonic texture
to the music that passes through it. It can be pushed to its most extreme
boost settings while retaining openness and clarity. The Type 69 Passive EQ
replicates all the controls of the original hardware. The Treble band is a fixed
10 kHz shelf EQ, while the Bass band functions as a stepped 50 Hz shelf filter
(-3,-6,-9,-12,-15 dB) or frequency selectable Peak EQ (60, 100, 200, 300
Hz). The Mid band operates as a frequency selectable Peak or Trough
(Notch) EQ with eight frequencies (.7, 1, 1.4, 2, 2.8, 3.5, 4.5, 6 kHz). Other
features include Level Adjust, EQ Cut (bypassing the EQ circuit while retaining
the native sound of the unit), and Phase Reverse.
Band Layout
Bass
band
Midrange
band
Treble
band
Global
controls
Figure 81. Helios 69 band control layout
The Helios Type 69 design works in such a way that (depending on the settings)
entire EQ circuits are switched in and out. In the hardware that often
meant audible popping. For the plug-in we use smoothing to reduce these audio
spikes, but they may be more audible than with other UAD plugs-ins. This
is most audible when engaging the Bass or 10 kHz band from OFF to any
other setting.
Each feature of the UAD Helios 69 interface is detailed below.
UAD Powered Plug-Ins Manual - 234 - Chapter 26: Helios Type 69 Equalizer